Water AMP 2010 - Gisborne District Council

Gisborne District Council

Water Supply

Activity Management Plan

Activity Management Plan Gisborne District Council Table of Contents

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Version Description of change Date Initial Draft 3 Draft for Kevin Strongman 7/10/08 jjt


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2009-2019

TABLE OF CONTENTS

1. Overview ............................................................................................................ 5

1.1. Why we do it ............................................................................................ 5

1.2. What we do .............................................................................................. 5

1.3. Where we are now .................................................................................. 5

1.4. Where we want to be .............................................................................. 6

1.5. How we plan to get there ....................................................................... 6

2. What we do ........................................................................................................ 8

2.1. Activity Description ....................................................................................... 8

3. Why do we do it ............................................................................................... 10

3.1. Activity Rationale .................................................................................. 10

3.2. Strategic Environment ......................................................................... 11

4. Where we are now ........................................................................................... 16

4.1 How the activity has developed ........................................................... 16

4.2 Levels of Service .................................................................................. 17

4.3 Asset Information ................................................................................. 18

Environmental Consents ........................................................................................... 21

Gisborne City Water Supply (GCWS) ........................................................................ 23

Te Karaka Water Supply (TKWS) .............................................................................. 38

Whatatutu Water Supply (WTWS) ............................................................................ 42

4.4 Current Costs and Funding Policy ...................................................... 46

4.5 Key partners/stakeholders ................................................................... 47

4.6 Assumptions ......................................................................................... 49

4.7 Risk Management ................................................................................. 50

4.8 Negative effects .................................................................................... 51

5. Where we want to be .......................................................................................... 53

5. Where we want to be .......................................................................................... 53

5.1 Growth ................................................................................................... 53

5.2 Trends .................................................................................................... 56

6. How we plan to get there ................................................................................... 63

6.1 Options and Choices ............................................................................ 63

6.2 Implications ........................................................................................... 69

6.3 Preferred option .................................................................................... 72

7. Improvement Plan ........................................................................................... 74

Appendix A - Levels of Service ........................................................................ 79

Appendix B – Asset information ...................................................................... 82


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Asset Info – Graphs ................................................................................................. 82

Asset Condition, Capacity/Criticality, Performance and Life ................................... 84

Appendix C – Financial Information .............................................................. 113

Appendix D – Risk Management Approach .................................................. 126

Appendix E – Asset Management Approach ................................................ 131

Activity Management Plan Gisborne City Council Overview

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1. Overview

1.1. Why we do it

To provide a constant, adequate, sustainable and high quality water supply to Gisborne’s

reticulated areas.

1.2. What we do

The Council provides reticulated water supplies for Gisborne City including parts of Manutuke and

Makaraka. Council also provides reticulated rural water supplies for Te Karaka and Whatatutu.

For these areas, Council owns and maintains the whole water supply network which covers:

Collection of raw water.

Treatment of raw water to produce suitable quality and quantities of drinking water.

Distribution of treated water to the point of supply to the customer, where it consistently meets

specific flow, pressure and quality standards. This includes water required for the city‟s

emergency fire fighting services.

Community outcomes

This activity contributes to the following community outcomes:

Connected Tairāwhiti Healthy Tairāwhiti

1.3. Where we are now

The Council maintains and/or owns the Gisborne water supply from its source supply, via water

treatment infrastructure to the water reticulation network, including the connections from the street

mains to all serviced property boundaries. At commercial metered connections, Council owns the

water meter and backflow preventer and charges for actual water used.

The water quality grading of Gisborne‟s reticulated water supply is currently being reviewed by the

Ministry of Health in accordance with the NZ Drinking Water Standards 2005. The last water quality

grading held by the Gisborne City water supply was an Aa grading.

The current water supply for Gisborne City is provided through seven distinct water sources. These

are:

Mangapoike Dam Catchment (Clapcott dam and Williams dam).

Te Arai River.

Waipaoa River.

Emergency bores - Cameron Road (2 bores) and Hansen Road.

Rural water supply sources include:

Waipaoa River bore - Te Karaka supply.

Mangatu River bore - Whatatutu supply.

Activity Management Plan Gisborne District Council

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Council‟s two treatment plants, Waingake Water Treatment Plant and Waipaoa Augmentation Water

Treatment Plant are modern and designed to meet requirements of the NZ Drinking Water

Standards.

Te Karaka and Whatatutu are serviced with supplementary supplies. These services are provided to

“top up” tanks during periods of insufficient rainfall. Water usage is restricted to approximately

1000 litres per household per day and is controlled using a ball cock system.

The Gisborne City system provides water to communities adjacent to the Waingake bulk water main,

which includes the communities of Manutuke and Papatu Road. Parts of the Poverty Bay flats

adjacent to the Waipaoa bulk water main are also supplied.

1.4. Where we want to be

Gisborne District Council is committed to retaining an Aa water quality grading for the Gisborne

City water supply and to be in full compliance with the New Zealand Drinking Water Standards

(DWSNZ) and the Fire Fighting Code of Practice.

The Council is also committed to improving the water quality gradings for Te Karaka and

Whatatutu (subject to Government funding under Capital Assistance Programme [CAP]).

Have properly maintained the integrity of the reticulated water supply assets (DWS 2005).

Adequately extend the reticulated water supply to new subdivisions within Gisborne City and to

Gisborne‟s rural communities as appropriate.

Ensure adequate security of supply for Gisborne‟s water network.

1.5. How we plan to get there

Undertake DWSNZ compliance projects including Hospital Hill Reservoir chlorine circulation

improvements, the installation of UV treatment at the water treatment plants and the Te Karaka

and Whatatutu rural water supply upgrades, which are solely dependent on Government

funding under Capital Assistance Programme (CAP).

Undertake key strategic asset management and maintenance projects to maintain the integrity

of the reticulated water supply assets. Key projects include:

Water Asset Componentry Condition Assessment and Renewals Programme.

Clapcott Dam Supply main replacement.

Te Arai pipe bridge repairs

Hospital Hill reservoir sealing

Knob Hill reservoir sealing

Hospital Hill reservoir waveband

Undertake a capital works to bring areas identified as not meeting the Fire Fighting Code of

Practice into compliance. Projects include:

Selected upgrades of water mains.

Construction of a new ring water main between Makaraka and the Awapuni Road water

main.


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Implement a demand management strategy that will improve security of supply for the water

network. The strategy will focus on water conservation programmes and public education, leak

detection programmes and may result in capital expenditure projects, such as the increase of

the Williams Dam storage capacity or potentially the installation of universal water metering for

domestic consumers.

Continue to undertake a comprehensive programme of maintenance and renewals. This will

minimise the need for emergency repairs that impose a greater cost and inconvenience to the

community.

INCLUDES TEXT INSERTED FROM THE TEN YEAR PLAN ON 19 FEBRUARY 2009


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2. What we do

2.1. Activity Description

Overview of the Public Water Supply System

Factor Gisborne City Te Karaka Whatatutu Total

Population Served 41,922 543 280 42,745

Length of Reticulation (kms) 240.58 4.1 2.7 247.38

Pump Stations (no.) 8 1 1 10

Fire Hydrants (no.) 1508 0 0 1508

Replacement Value ($000) 143,007 275 151 143,433

Depreciated Replacement Value ($000) 89,080 116 33 89,229

No. of Connections 12,972 162 42 13,176

How Water Sourced Dams, Rivers Bores Bores

Annual Total Volume of Water Produced (m³) 5.79M 36,500 11,960

Average Daily Volume of Water produced (m³) (2006/07) 15,540 142 33

Annual Total Volume of Water Sold (m³) (2006/07) 1.95M 0 0

Water Supply Grading U U U

Average Consumption per Connection (m³/year) 300 221 204

The following area communities are reticulated by Council administered supplies:

• Gisborne City, including parts of Manutuke and Makaraka

• Te Karaka

• Whatatutu

The following area communities are reticulated by non-Council administered supplies:

• Te Puia Springs

The following areas are non-reticulated, private supply systems sourced from roof catchments,

ground water bores/springs or surface water.

• Matawai

• Muriwai

• Wainui / Okitu

• Makorori

• Tolaga Bay

• Tokomaru Bay

• Ruatoria

• Tikitiki

• Te Araroa

• Patutahi

• Tiniroto

• Ormond

• Hicks Bay


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The Gisborne City Water Supply



mains to all serviced property boundaries. At commercial metered connections Council owns the


The Gisborne City system provides water to communities adjacent to the Waingake bulk water main,

which includes the communities of Manutuke and Papatu Road. Parts of the Poverty Bay flats

adjacent to the Waipaoa bulk water main are also supplied

The design capacity for the system is 30,000m³ per day. Demand on any given day may exceed this

and theoretically the system could be run to 43,000m³ per day (30,000m³ Waingake and 13,000m³

Waipaoa).

The water quality grading of Gisborne‟s potable water supply is currently being reviewed by the

Ministry of Health in accordance with the NZ Drinking Water Standards. The last water quality

grading held by the Gisborne City water supply was an Aa grading.


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3. Why do we do it

3.1. Activity Rationale

The goal of providing a public water system is to ensure the health of the community thereby

eliminating the need for individuals to provide their own water system with much higher health risks.

In providing a public water system the objective is to effectively provide a quality, efficient and

environmentally acceptable system in a controlled and regulated manner. To provide those services

for the present needs with an overview of not constraining future generations to ensure sustainable

growth for desired levels of service.

Other significant corporate goals are to:

Comply with all legislation.

Comply with audit requirements.

Complete programmes as detailed in the Strategic Plan, Annual Plan, Estimates and Activity

Management Plans.

The Council‟s principal objectives are:

The water network assets contribute to the practical delivery of the Council vision and mission as

follows:

Preservation Provide a water supply to protect public health.

Provides a modern and convenient to use

reticulation system, recognising the finite nature

of the water resource.

Enhance

Environment

Protects the physical environment through the

treatment and discharge of effluent through

approved methods with appropriate consents.

Sustainable

Management

Through ensuring water is transported in a

sanitary manner to its point of use in an integral

and secure system.

Economic Base Facilitate the continuing development of both

private and business interests by providing the

underlying water infrastructure required to

support the economic base of the community.

Future

Generations

Maintain the asset base in perpetuity by

providing a water system on a commercial basis

to achieve efficiency, sustainability and

customer focus.

The Council has several roles with respect to water supply services:

to co-ordinate the setting of community outcomes to which the water supply of the Council

might apply


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to monitor and report the progress that is being made towards achievement of those

outcomes

to act as service provider for ensuring good quality and safe community drinking water

supplies the publicly reticulated water supply areas

to act when any potential health risks relating to the absence of, or proper management of,

water supplies are identified

ensure proper maintenance of the reticulated water supply assets, so that their service

capacity and integrity is not reduced

anticipate the time when it may be necessary to extend, upgrade or renew the existing public

water supply system, and to plan accordingly

to ensure that fire hydrants are installed in the reticulated areas, and that they are kept

charged with water.

The Council currently provides reticulated water supplies for Gisborne City, Te Karaka and

Whatatutu. Council previously promoted the reticulation of Ruatoria but this, following community

consultation is still being reviewed. Consultation and investigation of the Council being involved in

the private water supply at Te Puia is ongoing. There are no other plans at this time for Council to

reticulate any other community. The Council also maintains an advisory and educational role with

respect to the private onsite supplies.

3.2. Strategic Environment

This AMP has been informed by a strategic stocktake of all relevant Legislation, Government

Strategies and Standards, Council Bylaws, Strategies and Plans etc. All capital and operating

projects (both proposed projects and those subsequently programmed for delivery) have been linked

to their associated strategic documentation, a summary of which is provided in Appendix X

A summary of the most relevant strategic documentation is provided below.

Community Outcome(s) How the Water Supply Activity Contributes

Safe & Healthy Haven: (Freedom

from health risk and harm)

By ensuring that the water is:

safe to drink;

clear

delivered under pressure; and

that the service meets the defined fire

fighting standards

Positive Leadership: (Positive

stewardship and improvements in

infrastructure promoting

environmental sustainability)

Through investment in infrastructure

Connected Communities: (Access

to essential services)

Provides a modern and convenient to use

Water Treatment and reticulation system


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The activity manager should list and describe the relationship to or impact of these plans on the

activity.

The following lists the corporate strategies, statutory requirements, plans, bylaws and other

important external stakeholder documents and plans relevant to the Water Supply activity.

Statutory

Health Act 1956

Health (Drinking Water) Amendment Act 2007

Local Government Act 2002

Resource Management Act 1991

Plans & Bylaws

Water Supply Bylaw 2008

Public Health Risk Management Plans (City and townships)

Regional Plan

District Plan

Corporate Strategies/Goals

Urban Development Strategy

Urban Coastal Strategy

Development Contributions

Procedural documents/Standards/Best Practice Documents

Drinking Water Standards 2005 (DWSNZ:2005)

Quality Management System

Engineering Code of Practice

Water Supplies Action and reporting protocol EHO – Water Utilities Protocol 2008

Utilities Assets Maintenance Contract

Professional Services Contract for Engineering Projects

NZS4404 – Subdivision Standard

Infrastructure Management Manual

Several key drivers to the Water Supply activity have been listed below describing its relationship

and/or impact.

Health Act 1956

The Health Act 1956 provides legal authority for Council to be involved in the provision of sanitary

works. The key provisions in the Act are as follows:

Ensuring the provision in any dwelling house of an adequate and convenient supply of wholesome

water.

Section 29 (Power and Duties of Local Authorities: Local Authority: Nuisances) provides for the


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Council to deal with nuisance so situated as to be offensive or likely to be injurious to health.

Health (Drinking Water) Amendment Act 2007

The main duties in the Act are to take all practicable steps to comply with the (previously voluntary)

drinking water Standards and to introduce and implement public health risk management plans. The

Act commenced 1 July 2008. From this date all drinking-water suppliers will be required to apply to

the Ministry for registration on the drinking-water register.

The other duties come into force progressively as follows: The Health (Drinking Water) Amendment

Act 2007 makes special provision for supplies that provide water for both agricultural and drinking

water purposes, to ensure that they are not required to make fit for humans water that is only used

by animals or crops. These supplies fit into the “rural agricultural drinking water supply” category.

Supplies in this category face no duties under the drinking water standards until 1 July 2013 at the

earliest. The drinking-water standards will be amended to determine exactly how such supplies will

be managed, and the Ministry is seeking opinions on how this should be done.

Local Government Act 2002

The Act provides the power of general competence for a local authority to undertake any business or

activity given certain provisos. The Act places limitations on the private sector involvement in the

ownership of assets and the delivery of services and has a general requirement that local authorities

continue to provide and maintain their capability to provide water services.

Resource Managemant Act 1991

The act establishes a planning framework covering land designation processes, requirements for

resource consents for activities which affect the environment. Gisborne is a unitary authority and

performs the functions of both a District and Regional Council. Regional Councils are responsible for

granting resource consents. The Gisborne District Council appoints independent commissioners to

determine its own consents in order to avoid any possible conflict of interest. The changing

legislative environment and higher environmental standards may present some challenges to the

operation of the Water Supply Activity in the future. Council staff will continue to monitor and report

on these changing legislative and environmental standards.

Water Supply Bylaw 2008

The Bylaw establishes a local regulating framework specifically set out for water supply relating to

aspects of service such as:

Conditions of supply (point of supply, metering, Level of Service, etc.)

Continuity of supply (restrictions, emergencies, liabilities and scheduled maintenance or

repair)

Types of supply (definition of ordinary, extra-ordinary and restricted supply)

Protection of water supply (entry to water reserves)

Customer responsibilities (backflow prevention, payment of services, etc.)

Breaches, offences and disputes

Public Health Risk Management Plans

The principle purpose of the Public Health Risk Management Plans (PHRMP) is to identify potential

events that present public health risks to the water supply system. Through this identification,

mitigation can occur and contingency plans can be put in place. Also, an improvement plan to further

isolate or eliminate the likeliness of this occurring is there for implementation, but this is subject to

future funding. Fields include: Identification of event, cause, preventative measures, monitoring

requirements and corrective actions.


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Regional Plan

The Regional Policy Statement is the main vehicle for interpreting and applying the sustainable

management requirements of the RMA in a local context. It identifies key issues and objectives,

policies and methods to guide the development of the lower order planning documents such as the

District Plan.

The Regional Policy Statement recognises the issue of competing demands on water resources and

that demand often occurs when resources are low. It also recognises that water use is sometimes

inefficient. Competing uses are to be managed through the resource consent process. The plan also

states that Council will investigate the charging for the use of water as a method for improving the

efficiency of the use of water.

Gisborne District Plan

The purpose of the Combined Regional Land and District Plan (District Plan) is to assist the Council

to carry out its statutory functions (both regional and territorial) in relation to the subdivision, use

and development of land. It includes standards and policy relevant to the development of water

supply networks in subdivisions and other developments.

For example, it requires reticulated water to be provided in streets built within the Gisborne Urban

Boundary and for reticulated water to be designed in accordance with firefighting codes of practice.

It also sets out a network design for the development of water in the Taruheru Block.

Urban Development Strategy

The Urban Development Strategy is being developed to guide the sustainable development of the

Gisborne urban area over the next 20 years.

Due to limited growth and the need to protect the rural hinterland, one of the strategy‟s key

directions is towards a compact city which will limit the expansion of the water supply network.

Urban Coastal Strategy

To shape future coastal development trends, the Gisborne District Council has prepared the Urban

Coastal Strategy for the coastal areas in and around the Gisborne area. Its purpose is to guide the

development of residential, business and open space areas along the coastline.

Development Contributions Policy

The purpose of the Development Contributions Policy is to ensure that developers make a fair

contribution towards the cost of infrastructure and services associated with developments.

The Development Contributions Policy includes a charge for both residential and non-residential

water supply.

Drinking Water Standards 2005 (DWSNZ:2005)

The Drinking Water Standards (DWSNZ:2005) contain comprehensive information for owners and

operators to assist in the management of public and private drinking-water suppliers.

It details how to assess the quality and safety of drinking-water using the revised water quality

standards and compliance criteria (collectively called the DWSNZ) that came into effect from

31 December 2005.

The drinking-water standards apply to drinking-water, that is, water intended to be used for human

consumption, food preparation, utensil washing, oral hygiene or personal hygiene. The criteria are

applicable to all drinking-water except bottled water, which must comply with the Food Act 1981.


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Gisborne District Council Engineering Code of Practice

The Code describes engineering standards which Council believes provide acceptable solutions, but

not necessarily the only solutions, for the engineering works associated with subdivision and land

development. Council will impose conditions on Resource Consents, using the Code of Practice as a

reference document for acceptable solutions. This practice provides acceptable engineering

standards for the design and construction of drinking-water reticulation systems that are to come

under Gisborne District Council jurisdiction and/or ownership. The design and construction objective

is to distribute water for consumption and fire fighting which meets the appropriate standards and

level of service for these uses.

Quality Management System

The Quality Management System Manual explains how the Council Water Treatment facilities

operate. This manual includes procedures and supporting documents such as forms, templates,

flowcharts and training manuals relevant to the council‟s water utilities division.

Linkages & Information Flow Between Key Legislation

Changing legislative environment and higher environmental standards may present some challenges

to the operation of the Water Supply system. Council staff will continue to monitor and report on

these changing legislative and environmental standards.

Figure 3i below indicates the linkages and information flow between key legislation, policy and

planning documents that guide the Council‟s Water Supply Activity and other corporate plans.

Local Government Act Resource Management Act

Water Supply

Activity

Management PlanAnnual Plan

District PlanLTCCP

Capital

Expenditure

Plan

Operational

Plans

Monitoring and

review

PHRMP

Public

Consultation /

District Vision


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4. Where we are now

4.1 How the activity has developed

Background and Rationale for the Council’s Involvement

Gisborne‟s public water supply was originally installed in the early 1900‟s.



mains to all serviced property boundaries. At commercial metered connections Council owns the


The current water supply for Gisborne City is provided through seven distinct water sources. These

are:

Mangapoike Dams (2)

Te Arai River

Waipaoa River

Emergency bores: Cameron Road (2) and Hansen Road

Rural water supply sources include:

Waipaoa River: Bore – Te Karaka supply

Mangatu River: Bore – Whatatutu supply

Council‟s two treatment plants, Waingake Water Treatment Plant and Waipaoa Augmentation Water

Treatment Plant were upgraded and constructed as part of Government Grants, post Cyclone Bola,

and contributions from a water levy provided by the citizens of Gisborne.

The two plants are considered modern and designed to treat water to meet the NZ Drinking Water

Standards turbidity requirements of less than 0.5NTU. Water consistently below 0.1NTU is routinely

produced.

The City of Gisborne is served with numerous reservoirs. These exist to balance demand within the

reticulation, provide additional city storage for fire fighting purposes, and general city security.

In general the system from Mangapoike Dams is gravity fed however to meet peak demands booster

pumping from the Mangapoike Dams to Waingake Water Treatment Plant is required. Pumping is

required when abstracting water from the Waipaoa River. Generally flows from Waingake to Gisborne

are gravitational and only during high summer flows is booster pumping at the city boundary

required. All water from the Waipaoa Augmentation Plant is required to be booster pumped and

cannot rely on any gravity. Additional booster pumping within the reticulation is provided at the

Ormond Road Booster Pump Station to equalise supply demands in outer Kaiti, and to maintain

equilibrium between the Hospital Hill Reservoir and the Knob Hill Reservoir.

The Gisborne City system provides water to communities adjacent to the Waingake pipe line,

including the communities at Papatu Road and Manutuke township. Manutuke properties should be

top up supplies only, similar to Te Karaka and Whatatutu, but is yet to be enforced effectively. Once

enforcement has been achieved, it should help alleviate the low suction pressure issues experienced

at the Makaraka pump station at high summer flows. Parts of the Poverty Bay flats adjacent to the

Bushmere line are also supplied.


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Te Karaka and Whatatutu are serviced with supplementary supplies. These services are provided to

“top up” tanks during periods of insufficient rainfall. Water usage is restricted to approximately 1000

litres per household per day and is controlled using a ball cock system.

4.2 Levels of Service

Water

How the LOS were developed:

The LOS project was initiated after the completion of the 2006-2016 LTCCP when it became

apparent that Councils current LOS and performance measures were inadequate. Council identified

the need for clearly defined levels of service so that the Council is able to monitor and report actual

service provision against intended service provision.

This LOS project in its entirety will not be reported in this Activity Management Plan however the

initial stakeholder identification, LOS survey and the final performance measures will be.

In 2006 Utilities identified a list of all stakeholders with respect to the three water activities

undertaken. A selection of the larger users and those we new little about were chosen. We then

surveyed these groups to understand better what they valued from each of the three water activities.

When the results were summarised the following groupings of value propositions were identified for

the water activity:

Supply of clean and hygienic water

Maintain a constant supply of water

Have a good water pressure

Water to be free from offensive taste and odours

Produce water in an environmentally friendly manner

Have a quick response to any breakdowns

These value propositions were developed into a full LOS survey in 2007. This survey combined the

three activities undertaken by Utilities. These are the water, wastewater and stormwater activities.

These surveys were undertaken by members of the Utilities Team and comprised of “door to door”

surveys in the evenings with “on the street” surveys at a selection of Gisborne City business areas.

These business areas comprised of the CBD, Balance Street, Kaiti Mall and the Elgin shopping

areas.

Over 300 survey forms were collected for the three water activities with around 100 being from the

business areas and the remaining 200 being from a variety of residential areas. The residential

areas were spread geographically around Gisborne. This was so not to favour the areas where we

had recently undertaken work. The residential areas were also selected to have an even range of

socio economic neighbourhoods. That is we had low, medium and high socio economic

neighbourhoods evenly surveyed. Larger industries and commercial businesses were also separately

surveyed.


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The survey results showed that for the water activity that most important two value propositions for

the respondents in order of priority were overwhelmingly:

to provide a clean and hygienic water supply

to maintain a constant supply of water

to provide continuity of supply

The results of the survey were used by managers to assist them in describing their levels of service,

and to identify appropriate performance measures with targets from years 1-10. This will assist

Council to deliver on the strategic direction agreed upon.

The LOS review will align all the activity‟s that we do on a daily basis. It will assist the decision

making role of our elected members. This will benefit the community in which we serve.

Please refer to Appendix A for technical and customer related measures.

4.3 Asset Information

Asset Valuations Asset Group Current Value Annual Depreciation Life Remaining (years)

Buildings and Services

The water activity asset has a replacement cost of around $120M and requires a total $2.5M per

annum to maintain and operate the asset to meet the service outcomes required. The increase in

costs is attributable to inflation adjustments and minor variations in maintenance and operating

associated with the capital programme.

Key to maintenance and operation is the feedback received from consumers. A 24 hour 365 day per

year call out service is provided by Council to receive information from the public in regards to the

water supply. Complaints provide “soft” information on reticulation performance. Despite greater

community awareness of its water supply (and hence an expected increase in complaints) the

number of complaints has remained reasonably static since 1999 at around 10.

The public water supplies administered by the Gisborne District Council were each established at

different times. Until November 1989 the supplies were administered by two independent local

authorities then known as Gisborne City and Waikohu County. Each authority had different levels of

service and different standards for providing those levels of service. The Gisborne City supply had

the higher standard.

The day to day management of the Gisborne public water supplies is carried out by the Council‟s

Engineering and Works Department. The performance of this department and therefore the

performance of the water supply are monitored by the Gisborne District Council. Water quality of the

supplies is monitored by the Environmental Health section of Council and the MoH representative -

the Public Health Unit. These assessments are carried out against the NZ Drinking Water Standards.

Maintenance can be defined as that group of activities that preserve an asset in a condition that

allows it to perform its required function. The on-going efficiency of the routine maintenance is

critical to achieve optimum asset life cycle cost that best suit the desired levels of service.

Maintenance falls within the categories of unplanned and planned. Unplanned maintenance is


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reactive work, carried out in response to reported or observed problems and defects, to enable the

scheme to function. Examples of unplanned maintenance include repair of leaking pipes, tobies and

fittings and maintenance required as a result of civil emergency damage. Planned Maintenance is

work carried out as a preventive measure to improve asset reliability for achieving levels of service.

Examples of planned maintenance include lubrication of components or routine flushing of water

mains to maintain water quality.

Operations can be defined as the group of activities which are necessary for the functioning of an

asset but which have no effect on asset condition. Such activities include resources, staff,

consumable materials and energy but exclude maintenance work. Operations of Council‟s water

treatment plant are undertaken by Council‟s Engineering & Works department. The operation of

Council‟s water treatment plants are undertaken by Council‟s Engineering and Works staff. Routine

maintenance is completed under contract for the reticulation assets. The management of the

schemes is performed by the Gisborne District Council Engineering & Works and the majority of the

routine maintenance is performed by contract. Much of the operational activity is based on local

knowledge and experience of long serving staff and is now all but captured and formally documented

in operational manuals.

Design functions are contracted through Opus International Consultants as a result of a competitive

tender, which included transfer of some of Councils staff. This Contract has recently been extended

and expires 1 July 2006.

To maximise efficiency, consultancy input is obtained for some specific and specialist tasks.

Key Maintenance and Operating Issues

After significant treatment plant optimisation and efficiency changes, the key issues relating to the

Gisborne water supply are now considered to be:

• DWSNZ:2005 Compliance

Includes Te Karaka and Whatatutu Water Supply Upgrades (subject to TAP & CAP

funding)

• Demand Management Planning

• Strategic Asset Management

• SNZ PAS 4509:2008 Fire Fighting Compliance

• Asset Maintenance

Further details on all of these issues are in Section 6: Options and Choices.

Business Continuity / Emergency Management

The Civil Defence Emergency Management Act 2002 (the Act) (enacted December 2002) required

the Gisborne District Council to carry out three major activities. These were:

• To form a Civil Defence Emergency Management (CDEM) Group within six months of Act‟s

enactment, with agencies identified in the Act. The Gisborne CDEM Group was formed on 23rd

May 2003.

• The development of a CDEM Group Plan within 2 years of enactment. The Plan was adopted on

the 30th June 2003.

• The formation of a Co-ordinating Executive Group (CEG). The CEG was formed prior to enactment

on the 9th of November 2001.

As required by the Civil Defence Emergency Management Act (CDEMA) 2002 Council has developed

a co-ordination team to consider the business continuity, lifeline and incident responses.

This team has produced a lifelines document that outlines Council's response should an event occur.

In support of this document a risk analysis of the water utility network has also been completed. The

water utility is part of the annual civil defence simulation exercise that regularly tests our emergency

preparedness. These simulations will be the basis for future plan development.


n-49637 Page 20

Identified in the development of this Activity Management Plan, there are proposed projects to

facilitate the establishment and implementation of numerous response and management plans.

These are additional to recommendations made in past Activity Management Plans and are currently

included in the improvement plan:

• Emergency Response Plan

• Demand Management Plan

• Drought Management Plan

• Algae Management Plan

Further detail is included in Section 7: Improvement Plan.

Environmental Management

The Waingake consent for the water take at the dams is covered by an existing use right that is

specified to expire in 2035. Currently, there are no take restrictions other than a requirement to

manage the river to ensure a minimum flow of 10 litres per second and there are no plans to

produce a management strategy for this river; but there is a proposed legislation called the “National

Environmental Standard for Measurement of River Takes”. If this comes into effect, it may have a

bearing on the minimum flow levels on the Te Arai River and Mangapoike Dams overflow stream.

The following conditions are put on the discharge from water supply reservoirs or pipelines (a

permitted activity) by the Regional Plan.

“The discharge of potable water into fresh water from any water storage reservoir, or water supply

pipeline, excluding domestic storage and pipelines, which does not contain:

• Disinfectants, or antiseptics, except not more than 0.3mg/l or free or combined residual

chlorine; or

• Not more than 1 mg/l of fluoride; or

• More than 50mg/l of suspended solids

shall be a permitted activity provided that the discharge complies with the conditions below.

Conditions:

1. The Gisborne District Council is notified at least 48 hours prior to any such discharge

2. The discharge shall not cause any erosion at, or downstream of, the discharge point

3. The discharge does not alter the natural course of the river or stream.

Environmental Monitoring and Reporting

The ground water takes associated with the Te Karaka and Whatatutu bores and surface water takes

are subject to a monitoring programme. No restrictions on groundwater consents apart from draw

down limits are in place. River levels are managed to ensure minimum residual flows are

maintained.

Council‟s actual performance in relation to the conditions of the resource consents is reported as per

the individual consent conditions. Reporting is to the regional regulatory staff, who can issue

compliance or abatement notices if consent conditions are not being met.

Water take volumes from the bores and the river takes are reported to the Environment and

Planning Department at various intervals. This data is reported into the State of the Environment

report produced annually by Council.

Discharge monitoring data is reported at monthly intervals following testing, this report is supplied to

the consent authority for review and compliance.

Environmental monitoring of the dam catchment is undertaken by council staff and contractors.

Rainfall, dam water quality, catchment sanitary surveys and security are all regularly monitored on

various programmes. Our environmental and catchment monitoring is in need of review to align with

new MfE and MoH source water criteria.


n-49637 Page 21

Environmental Consents

Resource Consents (‘Rights to Take’ and Discharge Permits) Already Held or Being Sought

Plant or

Area Type of Consent

Consent

Number Date Issued Expiry Date Quantities Comments

Whatatutu Water take WP203088A 9/02/2004 30/06/2014

Take 104m³ of

water per day from

underground

Te Karaka Water take WP-2008-

8071-00 02/05/2008 30/6/2014

Take 300m³ of

water per day from

underground

Waipaoa

WTP

Take water from

Waipaoa River WP201014A 5/06/2001 30/06/2011 12,960m³ per day

Take water from

Waipaoa River WP201015A 5/06/2001 30/06/2011 13,392m³ per day

Cameron

Road

Take water from

underground

WP-2008-

4340-00 04/04/2008 30/06/2013 4320m³ per day

Take water from

underground

WP-2008-

4341-00 07/04/2008 30/06/2013 4320m³ per day

Hansen

Road

Take water from

underground

WP2008-

4306-00 07/04/2008 30/06/2013 2600m³ per day

Waipaoa

WTP

Discharge

sludge DW198004A 20/07/1998 31/12/2008

Application for

consent renewal

being processed

Discharge

sludge DW198002A 20/07/1998 31/12/2008

Application for

consent renewal

being processed

Waingake

WTP

Discharge

supernatant DW197011B 20/01/2000 31/12/2008

Application for

consent renewal

being processed

Discharge

sludge DW197012B 20/01/2000 31/12/2008

Application for

consent renewal

being processed

Waipaoa

WTP

To construct

emergency

intake

RW199014A 28/05/1999 28/05/2029

Property Designations

The Gisborne District Council District Plan contains a schedule of designated sites. Not all water

network activity sites are designated in the District Plan, and further research and investigation is

required to determine whether additional site designation is required. Future expansion of site

designations in the District Plan has yet to be addressed, and is not currently a priority. Major new

asset sites are considered for designation as they are acquired.

The water supply network sites currently designated in the District Plan include:

• Reservoirs

• Water works purposes sites

• Water supply pump stations (some)

The water supply catchments above the dams are protected by QE2 Park status.


n-49637 Page 22

Property Easements

Few easements exist for the water supply network as the majority of the reticulation is on public

land. In the few areas where private land is crossed some of these are covered by easement and

some simply rely on the provisions of the LGA 2002 for access and authority.

Asset Retirement / Disposals etc

Currently there are no known disposal issues relating to assets, normal accounting procedures are

followed where existing assets are renewed and the old assets are disposed of. No assets have been

identified as not being replaced when their economic life has been reached.

There is room for improvement in the programming of these renewals and some new projects reflect

alleviating this:

• Asset Componentry: Overall Strategy

• Condition Assessments: Pipe Bridges

• Condition Assessments: Pipe

There are no current plans to dispose (sell) any part of the existing wastewater system, the new

treatment plant has the option to allow private involvement but this has not been decided nor

formally discussed and is not factored into this plan.

The Supply of Water for Fire Fighting Purposes

In October 2006, Utilities commissioned OPUS Consultants to construct a detailed hydraulic model

of the city of Gisborne. The scope of work included the following:

Hydraulic Model – Construction and Verification

Scenario Testing

Study Documentation and Model Handover

This model now supersedes the Beca Stevens report (Overview of Gisborne Water Network Analysis)

and has been predominantly used to ascertain the effect that large additions to the water network

will have when the scenarios are run in the model programme. The Growth Scenarios already studied

are the Western Industrial Ring Main and Wainui and Okitu Growth.

Within the model lies the basis for the future improvements and also an understanding of the

present condition, capacity and performance of the water network also relating to Fire Fighting flows,

but in order to finalize all recommendations on this subject, the calibration of the water model must

be completed first. This is programmed for 2009/10. It is important to note that until the verification

of the Hydraulic model is completed, all recommendations and monies will come from the BECA

report..

This work is in need of review in the light of the most recent issue of the fire service Fire Fighting

Code of Practice.

Areas identified as not meeting the Fire Fighting Code of Practice will be included in capital upgrade

programmes as appropriate. Existing work programmed includes:

• Fire flow capacity enhancement in 2008/09.

• A ring main to the Western Industrial area to boost capacity and fire fighting ability in 2011/12-

2012/13.

Further detail is included in Appendix C: Financial Information.


n-49637 Page 23

Gisborne City Water Supply (GCWS)

GCWS Collection/Source: Overview

HC Williams Dam

HC Williams is the largest dam in the network. Its condition remains good and ongoing monitoring is

occurring to monitor its performance. Summary details are given in the table below.

Clapcott Dam

Clapcott is the oldest of the three dams and the only concrete structure, (Williams and Sang both

being earth dams). This dam despite leaks is in good condition. A regular monitoring programme is in

place to monitor condition. Summary details are given in the table below.

Sang Dam

Sang Dam is the smallest of the three supply dams which feed the Waingake Water Treatment Plant

and acts as a header supply dam for the Clapcott Dam. The Sang Dam has a manual valve to allow

the discharge from it into the Clapcott Dam. An automatic siphon exists on the Sang Dam to siphon

excess flow from spilling down into the Clapcott Dam and discharges into the Mangapoike River.

Summary details are given in the table below.

Waingake Supply Dams

HC Williams Clapcott Sang

Capacity 2,291,864 m³ 1,121,365 m³ 347,568 m³

Useable Capacity 1,833,600 m³ 896,500 m³ 347,568 m³

Construction Earth Unreinforced concrete Earth

Date constructed 1974 1948 1972

Elevation (TWL) 473.50 m 472.89 m 514.65 m

Maximum depth 14.25 m 11.6 m 8.6 m

pH 7.8-8.0 7.6-7.7

Turbidity 0.7-1.0 0.7-1.0

Consent 30/6/2013 WP91002 30/6/2013 WP91005 30/6/2013 WP91003

Legal description Lot 1 SO 2163

Pt 2C SO 4299 CT 97/32

Pt 2C SO 4299 CT 97/32 3B1

and PT3B2 SO 4299 CT97/32 Pt 2 Sec 8 SO 6157

Summer water temp 19 C 19 C Empty

Summer oxygen levels 7.2-7.8 g/m³ 7.0-7.8 g/m³ Empty

Catchment area 254.9 ha 148.9 ha 41.1 ha

Replacement cost ($000) $10,330 $12,205 $2,393

Average annual rainfall 1,920 mm 1,920 mm 1,920 mm

Compressed air

(de stratification) Yes Yes No

Telemetry monitored Yes Yes No


n-49637 Page 24

0

500

1000

1500

2000

2500

Sang Dam Clapcotts Dam Williams Dam

Storage capacity

Minimum acceptable

storage at peak demand

Actual historical storage at

peak demand

Te Arai Bush Catchment and River

This catchment is unique to the majority if not all other water catchments within New Zealand. This

uniqueness comes from its size 1100 Ha of original native bush vegetation, the minimum size for a

self sustaining population to survive and that council owns and controls 100% of the catchment

area.

This source supplies the majority of water for the Waingake Water Treatment Plant and is the “jewel

in the crown” of our collection system. Summary details are given in the table below.

Waipaoa River

The Waipaoa River has the 2nd highest sediment loading per volume in the world and is the major

water body in the southern half of the Gisborne region. The sediment loading poses challenges for

treatment that has been overcome so that the Waipaoa is an essential augmentation supply source.

Summary details are given in the table below.

Waipaoa Te Arai

Summer Winter Summer Winter

Average flow (Daily mean) 70,920 m³/hr 212,112 m³/hr 150 m³/hr 750 m³/hr

Turbidity (Daily mean) 3.5 NTU >5 NTU 0.9 NTU >5 NTU

PH 7.8-8.1 7.8-8.1 7.8-8.4

Hardness 150-310 g/m³ 150-310 g/m³ 90-120 g/m³ 90-120 g/m³

Extraction up to 540 m³/hr up to 540 m³/hr 100-200 m³/hr 500-600 m³/hr

Rationing likely Yes No No No

Catchment area (Bolitho Road) 2,000 km2 1,072.45 ha

Land use

- Forestry 28.0% 28.0%

- Horticulture 2.0% 2.0%

- Agriculture 70.0% 70.0% 5% 5%

- Other 95% 95%

Extraction right 540 m³/hr 540 m³/hr No restriction No restriction

GCWS Collection/Source Pump Stations: Overview

Damline Booster Pump Station

Damline Booster Pump Station (Damline) is situated below the HB Williams and Clapcott Dams

immediately below where the pipelines from the two dams join. Under full gravity from the Dams a

maximum of around 500m³/hr can enter the Waingake Water Treatment Plant; with Damline


n-49637 Page 25

Booster Pump Station (DBP) operating this can increase to around 1000m³/hr. DBP has a very high

criticality in the supply of potable water to the city during the summer period.

Fairview Booster Pump Station

Fairview Booster Pump Station (Fairview) is inline after Damline. Fairview is used to put additional

water into the Waingake WTP during peak demands. With Damline operating the maximum flow from

the dams is 1000m³/hr with Fairview this can be increased to 1200m³/hr.

Fairview has a very high criticality in the supply of potable water to the city during the summer

period.

Waipaoa Intake Pump Station

These pumps extract water from the Waipaoa River and pump into the sedimentation ponds. These

pumps are considered part of the supply system. Two pumps are permanently on duty and act in

tandem while a third stays on stand-by should a fault occur. Pump duty is rotated.

The pump station is housed in a 5m well on the river side of the stop banks of the Waipaoa River. A

ramp out to the pump station provides free board from any potential flood waters and provides

access to the pumps. The pumps in the dry well are designed to be submerged should that occur.

The Waipaoa Intake Pump Station (WIP) extracts water from the Waipaoa River, over the Waipaoa

stop bank intercepting ponds before water treatment. Two T-wedge wire screens have been

constructed in the bed of the Waipaoa River and provide some pre-filtering before the take. The

wedge wire screens are backwashed with the use of air, and is based on a measured head loss

and/or time, and can operate and maintain flow to the sediment ponds during backwash.

A large concrete tower has been constructed within the flood channel of the Waipaoa River, and

extends down to the bed level and up to and above the top of the flood bank. The pump station

houses three split case pumps, three variable speed drives, a compressor and an extraction fan.

Internal walkways provide safety access from the top down to the pumps and the design is such that

the pumps can be submersed and still be operated.

Emergency Bores

These pumps were installed during the Cyclone bola Civil Defence emergency in 1988. These pump

stations have been kept so as to provide an emergency supply should all surface water sources

become inaccessible (e.g. volcanic activity). These pumps are undersized and not capable of

supplying Gisborne‟s normal demand. In the unlikely event that these bores should be required,

supply will be restricted and rationed.

Pump Station

Ye

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Bu

ilt

Ye

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Up

gra

de

d

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scri

pti

on

Co

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itio

n¹

Cri

tica

lity

¹

Re

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inin

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ife

Nu

mb

er

of

Pu

mp

s

kW

of

ea

ch

Pu

mp

To

tal C

ap

acit

y

(m³/

da

y)

Damline Booster – overall 1975 1993 1 5 29y 2 150/185 24,000

Mechanical Pumps 2

Building Building 2

Electrical / Telemetry PLC/Radio 1

Fairview Booster 1984 1994 2 5 38y 1 150 4,800

Mechanical Pumps 2

Building Building 2


Waipaoa Pumps 1990 1 4 55y 5 30 17,280

Mechanical Pumps 2

Building Building 1



n-49637 Page 26

Pump Station

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ar

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Ye

ar

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gra

de

d

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scri

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on

Co

nd

itio

n¹

Cri

tica

lity

¹

Re

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inin

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ife

Nu

mb

er

of

Pu

mp

s

kW

of

ea

ch

Pu

mp

To

tal C

ap

acit

y

(m³/

da

y)

Cameron Road Bore 1 1988 1996 1 2 39y 1 140 4,320

Mechanical Pumps 3

Well 97m 10m300mm screen 3

Building

Shed 2


Cameron Road Bore 2 1988 2 2 39y 1 4,320

Mechanical Pumps 3


Building Shed 2


Hansen road Bore 1988 2 2 39y 1 2,590

Mechanical Pumps 3


Building Shed 2


1Key:- 1 = Very Good

2 = Good

3 = Moderate

4 = Poor

5 = Very Poor

or Not Critical

Low Criticality

Moderate Criticality

High Criticality

Very High Criticality

Site Damline

(P1)

Damline

(P2)

Fairview

(FVB)

Waipaoa

Intake

(WPB)

Cameron

Road No. 1

Cameron

Road No. 2

Hansen

Road

Pumps 2 1 3 1 1 1

Type split case split case submersible submersible submersible

Make Harland WEIR PUMPEX PLEUGER

Model SDA10/10 SDA300/400 SDA250/300 KP203T-

4290

P104-3-V10-

70

Capacity 950m³/h 1000 m³/hr 200 m³/hr 396 m³/hr 234 m³/hr

Rated output 150 kW 185 kW 150 kW 30 kW 140 kW 75kW

Amps 255 313 252 54 -

Purchased 1993 10/94 23/5/91 1988

Installed 1993 10/94 23/5/91 1988

Hours (Total)

Overhauled 7/96

Reinstalled 7/96

Hours (since

overhaul)

Pump control PDL PDL DOL PDL PLC

Power Supply 3 phase 3 phase 3 phase 3 phase 3 phase 3 phase 3 phase


n-49637 Page 27

Combined 950m³/h 1000 m³/hr 1200 m³/hr 1+2 or 3

820m³/h

1 and 2

234 m³/hr

Duty Spare Well 2 Well 1 Duty Stand-by

Telemetry Yes Yes Yes Yes Yes Yes Yes

GCWS Treatment: Overview

Waingake Water Treatment Plant

The Waingake Water Treatment Plant commenced an upgrade prior to Cyclone Bola of March 1988

when three rapid sand filters were installed to increase water quality. Following Cyclone Bola there

was additional upgrading with two additional filters and relocation of the water treatment building to

the upper settling tank. This was completed at an approximate cost of $8M. The upgrade was

funded largely by Government grant as a recovery from Cyclone Bola, but included money from a

reserve funded from a water levy.

The Waingake Water Treatment Plant still remains one of the newer and well run plants in New

Zealand and the last Grading held for the Gisborne City Water Supply was an Aa Grading; the highest

possible. Winter flows average 12,904 m³ per day, peaking to an average summer flow of 20,006

m³ per day. The Waingake Water Treatment Plant can produce a maximum outlet flow of 31,000m³

(1,290m³/hr) but could not sustain this for a long duration because of several limiting factors. These

include:

Variable Te Arai Stream flows – Summer (time when large flows are required) usually have

low stream flows.

Variable Te Arai Stream quality – large flows usually mean higher turbidities untreatable by

the Waingake Water Treatment Plant.

Makaraka suction pressure operational restraints.

Water consumption demand in the city.

The likely maximum for a long duration is 29,000m³ per day. The plant has a reasonable level of self

sufficiency. Enough treatment chemical is held on site to operate for a minimum of one month.

Power supply is the limiting factor should mains power be unavailable. The site has emergency

power generators that run on diesel, enough diesel is held for between 3 and 5 days operation.

As part of the process the addition of lime for pH adjustment occurs at this site, with the lime being

stored in a silo and provides approximately six months of lime. Chlorine and fluoride are added to the

filtered water before discharging to Gisborne. Backwashing of filters is undertaken by gravity, from a

500 m³ high level storage tank, combined with compressed air to agitate and clean the filters.

Historically, substantial noise problems were present on site whenever the air compressor was

operated during backwashing. After installation of mufflers, this has reduced the noise considerably

and has hugely improved the working environment at the Treatment Plant.

An intermediate tank at the start of the distribution main exists and is called the clear water

reservoir with a capacity of 1,000m³ and acts as a balance tank between the City demand and the

treatment plant, and is necessary to allow operational changes to the treatment plant to meet

increased demand within the City. The clear water tank also acts as a buffer should operational

problems occur, causing a reduction in water quality and allows scouring of the water should an

unacceptable deviation from the NZ Drinking Water Standards occur. Additional security is gained

from the length and therefore time that it takes for water to be transported through the pipes from

the Waingake Water Treatment Plant to Gisborne, and generally provides a minimum additional

buffer of six hours before reaching the City.

Since commissioning, the Waingake Water Treatment Plant has been fine tuned to optimise the

operating regime and is also focused on future trends with changes in water quality. This is always

ongoing as a more efficient and effective way of operating the Treatment Plant will benefit all parties

from operations staff to customers. Also, any changes that can be incorporated to meet anticipated

future standards without any significant cost have been included over the last three years. An

indication of this is the current outward turbidity levels which Council is consistently meeting the NZ


n-49637 Page 28

0.1 NTU Drinking Water Standards and has aligned with the likely future standards set by EPA and

WHO. The additional treatment to achieve this we believe also provides additional microbiological

protection.

Historic problems with the existing clarifier at high flows have been noted. During these flows

material on the bottom of the sediment tank is picked up and re-suspended, causing a carry over

onto the filters and resulting in a major reduction and through put for the treatment plant. As a result

of the inadequate performance of the clarifier, Council has trialled successfully the use of direct

filtration polymers, annual cleaning before the busy summer season begins and has overcome the

operational problem of the clarifier.

The Waingake Water Treatment Plant is seen as a critical and strategic asset and as a consequence

receives high level maintenance, high level on line and off line monitoring, high alarm annunciation

on all aspects of its operation and ready response from appropriately trained and qualified water

treatment operators and repair contractors.

Areas where issues of plant performance need investigation include;

Clarifier performance and efficiency

Backwash water availability

Dam water availability and condition

Filter performance

The site has two full time attendants who live on-site but expansion of the telemetry system has

been undertaken with a view to allowing more operational freedom of the operators and to gain

further efficiencies. Currently the total number of operators within the Gisborne District Council is

three plus one Cadet also utilised as a part time operator. These staffing levels are generally well

below those of similar type plants, and reflects the high level control and use of automation and

telemetry monitoring.

Waipaoa Augmentation Plant

As part of the Government funding for the upgrade of the Gisborne Water Supply, the Government

required additional security of supply to Gisborne by the use of an alternative water source. This was

provided with the construction of the Waipaoa Augmentation Plant which has been designated as an

augmentation plant, and is operated on an intermittent basis. Its main purpose is to provide a

backup in the case of an emergency where the loss of water supply occurs from the Waingake Water

Treatment Plant, but has also provided additional capacity for future expansion and demand within

the reticulation.

The Waipaoa River is highly loaded with sediment and the plant has accordingly been designed to

cope with very high turbidity and sediment loading. As a result water is extracted from a twin wedge-

wire intake that is constructed in the river bed and is pumped to two settlement ponds which

provides 24 hour settling before again being pumped to the filters for treatment.

A large generator provides sufficient power to ensure operation continues regardless of a major

power failure.

The river intake pumps are stationed within the floodway of the Waipaoa River, built close to the stop

banks and designed to handle all flood events within the Waipaoa River. The pumps are housed in a

12 m deep chamber with the pumps being at river level, all electrical equipment at the top of the

chamber and above the stop bank levels. A walkway exists to provide access from the top of the stop

bank to the pumping station. The pump station is approximately 300 m from the Water Treatment

Plant.

The settlement ponds provide 24 hour storage at 540m³/hr; they have been designed to above all

known flood levels, and have a dirt embankment with both a concrete wall and base. The total

capacity of each pond is 7,000m³. Water is extracted from the settlement ponds by the pre-

sedimentation pumps, which pumps water to a balance tank to reduce surcharging of water into two


n-49637 Page 29

circular clarifiers. The clarifiers are provided for coagulation, the removal of bulk sediment. One of

the circular clarifiers also provides the additional use for the removal of hardness. From the two

circular clarifiers water is gravity fed to four deep bed rapid filters, similar to those used at the

Waingake Water Treatment Plant. Water is then pumped from the discharge sump from the filters to

a clear water reservoir, of 500m³ capacity which acts as a buffer between the demand from

Gisborne and the operational requirements of the treatment plant. Two major pumps are located in a

separate building to pump water from the clear water reservoir to the City of Gisborne, and have

been designed to meet all consent conditions relating to noise.

The addition of a treated water bypass line, which was installed in 2006/07, is able to re-direct

treated water back into an early stage pre-treatment pond using the City pumps and is there to

stabilise water from the filters to achieve optimal treatment conditions before being sent into the

reticulation system.

The plant is currently run with one operator stationed on-site; it is highly automated and linked with

Council‟s telemetry system. A broadband communication link between the Waipaoa Augmentation

Plant and the Waingake Plant enables the operators to remote control and remote alarm

annunciation, should it be required.

GCWS Distribution: Overview

Distribution Reservoirs

Council has three main reservoirs, Taumata, Knob Hill and Hospital Hill which provides approximately

one and a half days storage in summer and five days storage in winter. There are also a number of

small storage reservoirs within the system in order to meet demand in geographically high areas of

the city.

Major Storage

Hospital Hill - 38,000 m³

Knob Hill - 8,800 m³

The Hospital hill and Knob Hill are Gisborne city‟s primary storage facilities. Hospital hill is broken

into two cells, North and South and hold approximately 19,000m³ in each. In winter this gives

approximately 2.5 days storage. In peak summer this can drop to around 1 day. Hospital Hill is able

to supply the entire city but principally feeds the Western parts including the industrial, commercial,

and a significant portion of the domestic consumers. Knob hill principally services the Eastern area

of Kaiti and Tamarau but also contributes water flow to the CBD and port area.

These reservoirs are highly critical as they provide the buffer of primary storage from the plants to

the consumers and allow an even maintenance of pressure within the reticulation.

Hospital Hill Reservoir

The Hospital Hill Reservoir is the newest, has the greatest storage capacity and is a critical asset to

the overall performance of the reticulation system. The reservoir is divided into two cells,

independently valved and operated with one pipe feeding water in and out of the two cells. Level

control is with altitude valves requiring small hydraulic pumps to ensure adequate closure. Council

has made provision for an additional storage cell to be constructed on this site, but it is not

envisaged at this time that this will occur within the planning horizon of this Activity Management

Plan.

Knob Hill Reservoir

The Knob Hill Reservoir is a circular tank constructed of pre-cast, pre-stressed concrete and

operates with an internal float with water being delivered to and from the reservoir through one pipe.

This site is telemetered for water levels.


n-49637 Page 30

Taumata Reservoir

Built in 1933 Taumata is the oldest and highest reservoir in the reticulation system. It performs

adequately for the emergency purpose it serves and is not used in day to day operation. Water is

checked weekly and turned over monthly to maintain quality.

High Level Storage:

Approximately 20% of the area of Gisborne residential area resides on the surrounding hills,

bordering onto the Gisborne City flat land. In certain locations these properties are close to the

hydraulic grade line and result in diminished levels of service as a result. In a large number of cases,

on-site storage is required to ensure continuity of supply. To increase the levels of service and to

meet higher levels of compliance with the fire service code of practice, high level storage tanks have

been placed in strategic areas. These high level storages are located at Hill Road, Hauroa Road,

Gaddums Hill, Einstein Street and Pah Hill (Wallis Road). They are generally constructed from normal

domestic tanks and are banked together to provide the required storage. Additional booster

pumping is required from a holding tank for all high level storage except Einstein St.

High Level Storage

Pah Hill Tanks (5) – 136.2 m³

Einstein Street Tank (1) - 22.7 m³

Gaddums Hill Tanks (4) - 90.8 m³

Hauroa Road Tanks (4) - 90.8 m³

Hill Road Tanks (4) - 90.8 m³

In some cases water will fill the tanks under gravity and in some cases additional booster pumping is

required from a holding tank to the upper tanks, either for a combination of filling the upper tanks or

meeting the fire service code of practice.

Hauroa Road High Level Storage

Hauroa Road tanks service the houses in Hauroa Road. It is a dual system, with water feeding two

upper level tanks and two lower tanks which provide additional capacity utilised for fire fighting

requirements. Booster pumping is required for fire fighting purposes. Generally the upper tank

provides all necessary water. The lower booster pump is operated on a monthly basis as part of the

normal maintenance checks and is required to run for approximately one hour. This system is seen

as a critical component to the operation of reticulation and meets Council‟s legal obligations for fire

fighting purposes and ensures levels of service are maintained.

Gaddums Hill

Gaddums Hill has two upper tanks and operates on identical basis to the Hauroa Road system, in

this instance the pump is required to pump water to the upper tanks with the two lower tanks

stationed beside the pump station to act as storage for fire fighting purposes and are filled under

gravity.

Pah Hill High Level Storage Tanks

The Pah Hill tanks are stationed above the highest house at the top end of Wallis Road and consist

of five interlinked domestic house tanks, with water being pumped to them from a pump station

located beside the Knob Hill reservoir. The Pah Hill tanks form part of a proposed remediation for low

pressure in Oxford Street. Additional tanks as part of fire-fighting capacity upgrade is planned.

Further detail will be provided as part of the detailed design at that time. This system is considered

in excellent condition.

Einstein Street Upper Level Tanks

This tank is a 25 m³ plastic tank. Water is fed to the tank by gravity, generally at night when system

pressures are high, and back feeds water into the upper Einstein Street area during high peak

periods. Generally the combination of reticulation pressure and tank pressure provides adequate

levels of service. Regular inspections are undertaken on a weekly basis.


n-49637 Page 31

0

5

10

15

20

Taumata Nob Hill Hospital

Hill North

Hospital

Hill South

High level

storage

00

0's

m3

Storage capacity

Minimum acceptable storage

at peak demand

Actual historical storage at

peak demand

GCWS Distribution Pump Stations: Overview

Waipaoa City Pumps

The Waipaoa City pumps located in the Filter Pump Station at the Waipaoa Augmentation Plant,

deliver water from the clear water reservoir to the City of Gisborne. It has a maximum capacity of

720 m³/hr during emergency conditions but normal maximum operation is 540 m³. As part of the

overall consent operation of the plant, the pumps are designed to provide four set flow rates, these

are:

180 m³/hr

360 m³/hr

540 m³/hr

720 m³/hr (emergency provisions)

These pumps are in very good condition which reflects the minimal usage these pumps have had.

These pumps have a very high criticality rating.

Makaraka Booster Pump Station

This pump station is a highly critical, well maintained facility. This pump station can allow full gravity

flows or operate with pumps in parallel as shown in the diagram above. During full pump operation it

is possible to create negative pressure on the suctions side of the pump and hence is carefully

monitored and operated within defined parameters. Apart from a battery back-up for the telemetry

system, there is no stand-by power facility for the pumps available during power cuts on site, but the

power system is capable of having a generator connected. This was last successfully utilised during

the Y2K changeover and required an electrician for several hours.

Ormond Road Booster Pump Station

The Ormond Road Booster Pump Station was constructed in December 1998 to service low pressure

areas in outer Kaiti. Previously this had the potential to drain the full capacity of Knob Hill reservoir.

The pump station is in a chamber below ground to reduce noise, and to align with the existing

distribution main. The whole pump station is within road reserve and only the control cabinet is

above ground to provide easier access and overcome issues relative to ventilation for heat control.

Apart from a battery back-up for the telemetry system, there is no stand-by power facility for the

pumps during power cuts on site, but the power system is capable of having a generator connected.

This was last successfully utilised during the Y2K changeover and required an electrician for several

hours.

Taumata Reservoir Pump Station


n-49637 Page 32

The Taumata Reservoir pump station was commissioned in 2005/06 to help with the process of

filling Taumata Reservoir on an operationally efficient basis.

Historically, the process involved Fulton Hogan contractors to valve off certain parts of the City

reticulation to gain enough flow to fill the reservoir on the hill behind Gisborne Hospital. As a result of

sending water to one area of the City, this in turn created the problem of high water pressures in the

reticulation.

The pump station is located in the dangerous goods shed in the rear of the Tairawhiti District Health

property. It has no remote access or control capabilities due to the fact that it is run only to flush/fill

the reservoir. The pump is also a diesel run pump so power issues are not relevant apart from the

battery charger used to start the engine.

Gisborne High Level pump stations

Gisborne Water Supply also has four high level pump stations to boost supply into the higher areas

of the town to meet fire fighting standards. The details of these pump stations are shown in the table

below.

Pump Station

Ye

ar

Bu

ilt

Ye

ar

Up

gra

de

d

Co

nd

itio

n¹

Cri

tica

lity

¹

Re

ma

inin

g L

ife

Nu

mb

er

of

Pu

mp

s

To

tal C

ap

acit

y

(m³/

da

y)

Makaraka Booster 1980 1993 1 5 34y 3 26,400

Mechanical 2

Building 1

Electrical / Telemetry 1

Ormond Road 1998 1 3 52y 1

Gis. High Level – Hill Road 1994 2 4 48y 1

Gis. High Level – Hauroa Road 1990 2 4 44y 1

Gis. High Level – Gaddums Hill 1991 2 4 45y 1

Gis. High Level – Pah Road 1969 2 4 23y 1


2 = Good

3 = Moderate

4 = Poor

5 = Very Poor

or Not Critical

Low Criticality


High Criticality


GCWS Reticulation Pipework: Overview

For the purposes of this Activity Management Plan trunk mains are considered the main feeder lines

from water treatment plants to the reticulation mains. For the purposes of this asset management

plan distribution mains are considered the main feeder lines from water treatment plants to the

reticulation mains within the Gisborne City.

Gisborne City Water Distribution Model




Scenario Testing



n-49637 Page 33

This model now supersedes the Beca Stevens report (Overview of Gisborne Water Network Analysis)





present condition, capacity and performance of the water network.

Waingake Distribution Main

The Waingake line is a 525mm (21 inch) concrete lined steel pipe with gibault joints, approximately

every 7 m, is cathodically protected and extends from the Waingake Water Treatment Plant to the

intersection of Gladstone Road and Lytton Road with various connections along the line.

Most pipe bridges meet the required performance criteria and are of good condition. One exception

and an area of concern is the Te Arai River swing bridge. This has been identified as a possible point

of failure during a flood event which did occur in late 2005 and is in the Gisborne City Water Supply

PHRMP. This involves the implementation of the maintenance programme recommended in the Te

Arai River swing bridge structural report. Further details are in Section 6: Options and Choices.

The self-supporting span at Emerald Hills requires technical reviewing as apparent sagging is evident

in the pipeline, but it is of no immediate danger of failure.

Additional diversion of the Waingake water occurs at Granny Tarr Street opposite the Gisborne

Showgrounds, and feeds through a 450 asbestos cement pipe across the Taruheru River to

Cameron Road to Back Ormond Road via Hansen Road. The main continues through the full length

of Ormond Road, down to Wi Pere Street with dispirit take offs and a main feeder running to the

hospital hill reservoir, but for the purposes of this part of asset we will treat the asbestos cement

main separately from the reticulation.

Waipaoa Distribution Main

A 400 mm concrete lined steel pipe fully welded, which extends from the Waipaoa Augmentation

Plant and joins into the Waingake supply line downstream at the Makaraka Booster Pump Station,

approximate distance being 6 km. Additional security of welding the pipe to form a continuous line

was taken to overcome risks associated with earthquake and provide continuity for Cathodic

Protection.

Reticulation Components

The physical parameters of the Gisborne City reticulation are provided for in the following tables,

which show the age profile, material type and pipe diameter for the water mains. The age profile

mirrors all ancillary equipment associated with those mains, such as fire hydrants and valving, and

for the purposes of this Activity Management Plan, these have been included as part of the mains

profile for valuation purposes. The table identifies that there are three main pipe material types

being cast iron, asbestos cement and concrete lined steel.

For the purpose of this Activity Management Plan, valves, hydrants and air valves have been

included in the valuation costs for the pipe line, as they have identical ages as the pipe line and any

repairs undertaken for these components are only to maintain their level of service and are unlikely

to be reused should that line be replaced at a later stage. This will be reviewed as part of the

improvement programme.

Schedule of Pipework

Pipe Asset (mm) Length (metres)

Pipe Size

20 180


n-49637 Page 34


25 466

32 14

38 70

40 99

50 14,314

63 633

75 1,061

90 490

100 92,610

125 285

150 45,501

180 247

200 9,072

225 4,082

250 1,656

300 13,921

375 308

400 6,011

450 13,408

525 36,153

Total Length (m) 240,581

Pipe Fittings

Hydrants 1,508

Valves 1,652

Reticulation Material Type

Reticulation Material Type

05

10152025303540

AC Cast Iron Expoxy

Lined

MDPE PVC ST-CL OTHER

Materials

% P

ipe L

en

gth

Reticulation Age

Material type of the reticulation system is largely dependant on installation date. Early pipes were made of cast iron, in the 50’s to 80’s AC mainly used. Since the 1980’s plastic have dominated material types being installed.


n-49637 Page 35

Reticulation Age

0

5

10

15

20

25

0-5

6-1

0

11-1

5

16-2

0

21-2

5

26-3

0

31-3

5

36-4

0

41-4

5

46-5

5

56-6

0

61-6

5

66-7

0

71-7

5

76-8

0

80+

Unknow

n

Age (Years)

% P

ipe L

en

gth

Reticulation Condition

0

10

20

30

40

50

60

70

80

1 Very Good 2 Good 3 Moderate 4 Poor 5 Very Poor

Condition Grading

% P

ipe L

ength

Reticulation Performance

0

10

20

30

40

50

60

70

80


% P

ipe L

ength

The pipe ages are reflective of the city development and expansion.

Recent cast iron rehabilitation, lead pipe replacement programme and the relevantly recent installation dates means all assets are moderate or better

The good performance is a reflection on the

condition and age of the reticulation.


n-49637 Page 36

* Definition of Performance and Criticality Gradings:-

Grade Condition Performance Criticality

1 Very Good Always meets target service

standards.

No significant adverse short-term impact.

2 Good Almost always meets target service

standards.

Failure will cause localised and serious

disruption to service delivery.

3 Moderate Generally meets target service

standards.


disruption to service delivery, possible

health and safety effects and / or loss of

critical data.

4 Poor Does not generally meet target

service standards.

Failure will cause serious disruption to

service delivery over a substantial area,

possible health and public safety effects.

5 Very Poor Never meets target service

standards.

Widespread and serious disruption to

service delivery, possible health and public

safety effects.

GCWS Fire Fighting Capacity

Gisborne District Council aims to meet SNZ PAS 4509:2008 New Zealand Fire Service Fire Fighting

Water Supplies Code of Practice for all Urban Fire Districts.

The most influential factor in assessing the future demands is the existing requirements under the

New Zealand Fire Service Code of Practice for fire hydrant flows and storage capacity as opposed to

domestic demand. Some upgrading of watermains has been completed and should resolve the some

known capacity issues. The design standard that will be applied to the capacity upgrading work is the

SNZ PAS 4509:2008 New Zealand Fire Service Fire Fighting Water Supplies Code of Practice.

The Fire Fighting Code of Practice is prepared and issued by the NZ Fire Service pursuant to The Fire

Service Act 1975. It defines various water supply classifications from W1 – W8 (ranging from single

family dwellings to hotels/businesses to supermarkets/industrial areas) by the fire hazards present

and then states minimum water flows, storage volumes and pressures required. The water supply

classification can change within a town between the residential properties (W3), industrial areas

(W7/8) and depending on the floor area (fire cell) of commercial/public properties. Therefore, the

demands on the water supply differ between these areas.

Gisborne City Water Supply is the only gazetted Urban Fire District within Gisborne District. The Fire

Fighting Code of Practice is a guideline document but can be incorporated into bylaws under section

146(b) of the Local Government Act 2002 or district plans prepared under the Resource

Management Act 1991. Section 92(2) of the Fire Service Act 1975 also enables regulations to be

made specifying requirements for fire hydrants, however, this will only be resorted to if the guidelines

prove to be ineffective in achieving compliance. It is important to note that the Building Code also

requires that fire safety clauses be met.

It is noted that the flows required for fire fighting are generally well in excess of the flows required for

domestic or industrial consumption. Therefore, if the fire fighting flow requirements are met this


n-49637 Page 37

could be considered to meet the quantity requirements for providing a water supply under the

various Government Acts and Regulations.

Name Dist. Capacity Category Type Supply

Gisborne Piped Fire fighting Domestic and Industry Urban Demand

Te Karaka Piped Consumer Domestic Residential Restricted and Storage

Whatatutu Piped Consumer Domestic Residential Restricted and Storage

Te Puia Piped Consumer Domestic Residential Restricted and Storage




Scenario Testing


This model now supersedes the BECA Stevens report (Overview of Gisborne Water Network Analysis)





present condition, capacity and performance of the water network, but in order to finalize all

recommendations on this subject, the calibration of the water model must be completed first. This is

programmed for 2009/10. It is important to note that until the verification of the Hydraulic model is

completed, all recommendations and monies will come from the BECA report.

Both the required flow rates and storage volumes are considered when examining compliance with

the Fire Fighting Code of Practice.

Currently Gisborne City Water Supply meets the Fire Fighting Code of Practice in all but the high level

areas and some outlying areas where hydraulic grades must be overcome. Upper storage capacity

has been increased to meet the Code of Practice.

It is possible that the requirements for fire fighting may reduce over time as changes in fire fighting

technology occur, for example, development of foam and non-water products for extinguishing fires.

This may alter the Fire Fighting Code of Practice and hence the design requirements. These changes

will be monitored and the appropriate actions taken as they occur.

Areas identified as not meeting the Fire Fighting Code of Practice will be included in capital upgrade

programmes as appropriate. Existing work programmed include:

Fire flow capacity upgrade in 2011/12-2012/13.

A ring main to the Western Industrial area to boost capacity and fire fighting ability in

2008/09-2009/10.

Further detail on these proposed projects are in Section 6: Options and Choices.

There are 1508 fire hydrants in the Gisborne City fire area. The fire services in their monthly checks

identify the hydrants that need maintenance and fail to meet their minimum standard.


n-49637 Page 38

Te Karaka Water Supply (TKWS)

TKWS Overview

Te Karaka Water Treatment Station

Te Karaka Water Treatment Station is located on the township side of the Waipaoa river stop bank

and provides a water supply that is supplementary to the rainwater collected by each individual

consumer during extended dry periods. Treatment involves oxidation and filtering of raw water, then

chlorine is added to help with disinfection.

This system was setup through funding from a Health Department subsidy and was installed in

December 1982. Since then, issues regarding low water quality from the bore, insufficient treatment

facilities and non-compliance from the connected properties.

This pump station is well maintained but is beginning to age with an increasing number of faults

expected as the economic life nears ending.

Supply Pump Stations

The pump was replaced in 2005 as the impellors of the old one separated from the spindle and the

condition grading reflects this. The pump has a high number of starts per hour as it operates in a

pressure pump capacity more than a strictly supply pump. This is the only pump in the system and is

used to force water through the treatment process and to the consumer.



Schedule of Pump Stations

Pump Station

Ye

ar

Bu

ilt

Ye

ar

Up

gra

de

d

De

scri

pti

on

Co

nd

itio

n1

Pe

rfo

rma

nce

1

Cri

tica

lity

1

Re

ma

inin

g L

ife

Nu

mb

er

of

Pu

mp

s

Groundwater 1983 Nil Bore pump 1 3/4 5 9y 1


2 = Good

3 = Moderate

4 = Poor

5 = Very Poor

or Not Critical

Low Criticality


High Criticality


Water Quality

Untreated Water Quality

Water quality from the bore is poor. The water has a high iron and manganese content. The supply is

provided from a bore on the outer stop bank of the Waipaoa River and is pumped from the bore into

a pressure tank, and fed directly to the town.


n-49637 Page 39

Treated Water Quality

The water quality has been assessed as part of the Health Department grading as an Ee. Major

concerns with supplying a higher water quality exists, due to the supplementary nature of the supply

being discharged directly into rain water tanks, which has a lower water quality than that being

provided to the consumer.

As part of the future water review standards for the NZ Drinking Water Standards it would be

proposed to address water quality used directly with the Health Department and the Chief Medical

Health Officer, as currently standards do not adequately cover this situation. This will be solved with

the success of the TAP & CAP application.

Schedule of Treatment Plants

Treatment

Plant Description

Year

Built

Ye

ar

of

Ma

jor

Up

gra

de

s

Structure Plant General

Re

pla

ce

me

nt

Va

lue

($0

00

)

Co

nd

itio

n1

Pe

rfo

rma

nce

1

Re

ma

inin

g L

ife

Co

nd

itio

n1

Pe

rfo

rma

nce

1

Re

ma

inin

g L

ife

Cri

tica

lity

1

Te Karaka

Cumry iron

removal

and

chlorinator

1982 Nil 2 2 9y 3 4 9y 2 $68.3


2 = Good

3 = Moderate

4 = Poor

5 = Very Poor

or Not Critical

Low Criticality


High Criticality


The water produced by this plant is independently sampled by the Gisborne District Council

Environmental Health Office who acts on behalf of the MoH. Sampling programmes include

microbiological monitoring, and chemical parameter monitoring.

Catchment Security

The bore feeds from the fluvial deposits of the Waipaoa River. The groundwater is shallow and

unsecure.

Supply Pipe Line

Te Karaka is situated at a relative level above the bore pump station. A 100mm PVC line extends

from the bore pump shed to the reticulation system.

Reticulation

The reticulation is a supplementary supply and security is impossible to ensure to the consumers tap

as the water supply mixes with unknown water quality in the private tank systems. Water supply is

managed so that the water has residual chlorine of at least 0.3g/m³ when entering the tank.

Quality Control

Management Quality Assurance

The same management Quality Assurance techniques as Gisborne City will be applied.

Operational Quality Assurance


n-49637 Page 40

To establish and ensure the ongoing improvement of the quality of this Plan a series of quality

assurance systems are planned as follows:

Treatment Plant operational manuals

Reticulation quality systems

Hazard quality systems

Connection controls

Backflow Prevention

Treatment Plant operations manuals

The Te Karaka system has had an operational manual for the groundwater pump station and

treatment system developed. Operation occurs within the confined of these procedures.


A public health risk management plan (PHRMP) is currently in the draft stages at the time of writing

this Activity Management Plan but is scheduled to be submitted to the Ministry of Health within the

next few months. This is used to apply for funding from Central Government set aside to offer Capital

and Technical assistance (TAP & CAP funding) for small water supplies. GDC‟s aim is to completely

overhaul the water supply system in Te Karaka but this is solely subject to the funding that is granted

by the Ministry of Health.

An extensive monitoring programme exists by various stakeholder groups. This monitoring includes;

Monitoring – Daily, for basic chemical parameters

Sampling – Monthly, microbiological

Sampling – 2 monthly, Iron, Manganese

Spot condition sampling, as required.

Hazard Quality systems

Site safety is a critical component to the operation of the treatment plant, with a large portion of

safety documents having been written. The Treatment facility has a chlorine solution on site for

treatment. The chlorine on site is below the amount required for the site to require a chlorine storage

certification.

On-site induction for visitors and contractors exists. Ongoing operator training is provided to maintain

competency levels. As part of the need to identify and fulfil requirements of Occupational Safety &

Health, it has been necessary to document to a higher level the processes and safety requirements.

Health and Safety is an ongoing evolving process and monthly meetings are held to specifically raise,

highlight, resolve and educate health and safety items amongst the operational.

Council‟s reticulation maintenance contractor Fulton Hogan has a strong health and safety policy

and these issues are handled within the maintenance contract.

Control over connections

Council has strict control over the existing and new connections. All connections require a toby

boundary tap to be installed. This allows council to isolate service lines that do not meet the Council

requirements and apply restrictions where necessary.

All domestic connections shall progressively be upgraded to a toby manifold.

New connections to existing infrastructure require approval by Council. Only Council‟s approved

maintenance contractor is allowed to tap the water main for new connections.

A Level 3 Water Reticulation Service Person qualification is the minimum standard qualification a

person working on the water main including the installation of new connections.

Backflow Prevention


n-49637 Page 41

A double check valve backflow preventer is provided in all new toby manifolds. This unit houses both

the backflow prevention and flow restrictor. These were last inspected in 2006/07 by GDC staff

which gives further detail under „Performance‟ in the Te Karaka: Reticulation section of this

document.

TKWS Reservoirs, Dams and Other Storage Facilities

There are no storage facilities or reservoirs in this system other than those privately owned that this

service supplements. 1 tank exists for the sole use of the rural fire service.

The size of private storage varies but is generally 22 cubic metres (5,000 gallon)

The condition of the private tanks vary any leaks are noted during regular property inspections and

addressed as required.

TKWS Reticulation









Pipe Size

25 655

32 135

40 855

50 1545

75 490

100 400

Total Length (m) 4080

Pipe Fittings

Hydrants 0

Valves 12

TKWS Fire Fighting Capacity


n-49637 Page 42

The reticulation is insufficient to provide fire fighting flows and no hydrants are provided in the

reticulation system. A number of bulk fire storage tanks exist underground in Currie, Cliff and Library

Roads.

Whatatutu Water Supply (WTWS)

WTWS Overview

The original design for the Whatatutu water supply was for 400 people, with the original population

at 320. The original forecast was for the population to increase as a consequence of forestry

development in the Mangatu Area, in actual fact the population has diminished to approximately

280 people, and further growth in this area is unlikely over the next planning horizon. The original

design was to cater for 1000 litres of water per property per day, which is the equivalent to 250 litres

of water per person per day per household, assuming occupancy of four people.

The original scheme was undertaken in conjunction with a Health Department subsidy, which was

available at that time. Installation took place in 1979 and was provided on a supplementary supply

basis to top up existing users rainwater tanks during extended dry periods.

The original supply is provided from a bore adjacent to the Mangatu River and is pumped from the

bore into a pressure tank, pumped up the hill to a sand filter and fed directly to the town. This has

subsequently been replaced with a Cumary filter, which introduces oxygen into the water supply to

assist in iron, and manganese removal, which is taken out as part of the filtration process. This is

then chlorinated and pumped through pressure tanks to the consumer.

No loss of service potential exists for these assets and maintenance levels are carried out on a

proactive and reactive basis. A contract exists for the maintenance of this reticulation system with

Fulton Hogan, Council‟s maintenance Contractor, with a pseudo township caretaker residing at Te

Karaka and employed by Fulton Hogan. His duties consist of daily water quality testing at the Te

Karaka and Whatatutu bores recording those results and forwarding them through to Engineering

and Works for further processing. Complaints are currently fielded at the Te Karaka Service Centre,

with all complaints being logged and submitted to Engineering and Works on a weekly basis. Due to

the static population no increase in the reticulation is anticipated and only the ongoing renewal of

the system is being planned for.

As previously stated, renewals will be based on current levels of service but further public

consultation will proceed as part of any renewal plan, closer to the time of replacement. No deferred

renewals exist.

The original forecast was for the population to increase as a consequence of forestry development in

the Mangatu Area, in actual fact the population has diminished, and further growth in this area is

unlikely over the next planning horizon. The original design was to cater for 1000 litres of water per

property per day, which is the equivalent to 250 litres of water per person per day per household,

assuming occupancy of four people.

The original scheme was developed in conjunction with the installation of sewer reticulated system.

It was constructed with Health Department subsidy which was available at that time. Installation took

place in December 1982 and was provided on a supplementary basis to top up existing users

rainwater tanks during extended dry periods.

Supply Pump Stations

The pump was replaced in 2005 as the impellors of the old one separated from the spindle and the

condition grading reflects this. The pump has a high number of starts per hour as it operates in a


n-49637 Page 43

pressure pump capacity more than a strictly supply pump. This is the only pump in the system and is

used to force water through the treatment process and to the consumer.



Schedule of Pump Stations

Pump Station

Ye

ar

Bu

ilt

Ye

ar

Up

gra

de

d

De

scri

pti

on

Co

nd

itio

n1

Pe

rfo

rma

nce

1

Cri

tica

lity

1

Re

ma

inin

g L

ife

Nu

mb

er

of

Pu

mp

s

kW

of

ea

ch

Pu

mp

Groundwater 1979 Nil Bore pump 1 3/4 5 7y 1 4


2 = Good

3 = Moderate

4 = Poor

5 = Very Poor

or Not Critical

Low Criticality


High Criticality


B = Building

C = Cabinet Only

SB = Switchboard

Water Quality

Untreated Water Quality

Water quality from the bore is poor. The water has a high iron and manganese content. The supply is

provided from a bore adjacent to the Mangatu River and is pumped from the bore into a pressure

tank, and fed through to the pump station located at the end of Peneha St.

Treated Water Quality

The water quality has been assessed as part of the Health Department grading as an Ee. Major

concerns with supplying a higher water quality exists, due to the supplementary nature of the supply

being discharged directly into rain water tanks, which has a lower water quality than that being

provided to the consumer.

As part of the future water review standards for the NZ Drinking Water Standards it would be

proposed to address water quality used directly with the Health Department and the Chief Medical

Health Officer, as currently standards do not adequately cover this situation. This will be solved with

the success of the TAP & CAP application.

Schedule of Treatment Plants

Treatment

Plant Description

Year

Built

Ye

ar

of

Ma

jor

Up

gra

de

s

Structure Plant General

Re

pla

ce

me

nt

Va

lue

($0

00

)

Co

nd

itio

n1

Pe

rfo

rma

nce

1

Re

ma

inin

g L

ife

Co

nd

itio

n1

Pe

rfo

rma

nce

1

Re

ma

inin

g L

ife

Cri

tica

lity

1

Whatatutu Cumry iron

removal

and

chlorinator

1979 Nil 2 2 7y 3 4 7y 2 $68.2


2 = Good

or Not Critical

Low Criticality

B = Building

C = Cabinet Only


n-49637 Page 44

3 = Moderate

4 = Poor

5 = Very Poor


High Criticality


SB = Switchboard

The water produced by this plant is independently sampled by the Gisborne District Council

Environmental Health Office who acts on behalf of the MoH. Sampling programmes include

microbiological monitoring, and chemical parameter monitoring.

Catchment Security

The bore feed from the fluvial deposits of the Mangatu River. The groundwater is shallow and

unsecure.

Supply Pipe Line

Whatatutu is situated at a relative level above the bore pump station. A 50mm PVC line is supported

up the hill side with waratah stakes and has been covered with 100mm of soil to protect it from

stock damage and UV light.

Reticulation

The reticulation is a supplementary supply and security is impossible to ensure to the consumers tap

as the water supply mixes with unknown water quality in the private tank systems. Water supply is

managed so that the water has residual chlorine of at least 0.3g/m³ when entering the tank.

Quality Control

Management Quality Assurance

The same management Quality Assurance techniques as Gisborne City will be applied.

Operational Quality Assurance

To establish and ensure the ongoing improvement of the quality of this Plan a series of quality

assurance systems are planned as follows:

Treatment Plant operational manuals


Hazard quality systems

Connection controls

Backflow Prevention

Treatment Plant operations manuals

The Whatatutu system has had an operational manual for the groundwater pump station and

treatment system developed. Operation occurs within the confined of these procedures.


A public health risk management plan (PHRMP) is currently in the draft stages at the time of writing

this Activity Management Plan but is scheduled to be submitted to the Ministry of Health within the

next few months. This is used to apply for funding from Central Government set aside to offer Capital

and Technical assistance (TAP & CAP funding) for small water supplies. GDC‟s aim is to completely

overhaul the water supply system in Whatatutu but this is solely subject to the funding that is

granted by the Ministry of Health.

An extensive monitoring programme exists by various stakeholder groups. This monitoring includes;


n-49637 Page 45

Monitoring – Daily, for basic chemical parameters

Sampling – Monthly, microbiological

Sampling – 2 monthly, Iron, Manganese

Spot condition sampling, as required.

Hazard Quality systems

Site safety is a critical component to the operation of the treatment plant, with a large portion of

safety documents having been written. The Treatment facility has a chlorine solution on site for

treatment. The chlorine on site is below the amount required for the site to require a chlorine storage

certification.

On-site induction for visitors and contractors exists. Ongoing operator training is provided to maintain

competency levels. As part of the need to identify and fulfil requirements of Occupational Safety &

Health, it has been necessary to document to a higher level the processes and safety requirements.

Health and Safety is an ongoing evolving process and monthly meetings are held to specifically raise,

highlight, resolve and educate health and safety items amongst the operational.

Council‟s reticulation maintenance contractor Fulton Hogan has a strong health and safety policy

and these issues are handled within the maintenance contract.

Control over connections

Council has strict control over the existing and new connections. All connections require a toby

boundary tap to be installed. This allows council to isolate service lines that do not meet the Council

requirements and apply restrictions where necessary.

All domestic connections shall progressively be upgraded to a toby manifold.

New connections to existing infrastructure require approval by Council. Only Council‟s approved

maintenance contractor is allowed to tap the water main for new connections.

A Level 3 Water Reticulation Service Person qualification is the minimum standard qualification a

person working on the water main including the installation of new connections.

Backflow Prevention

A double check valve backflow preventer is provided in all new toby manifolds. This unit houses both

the backflow prevention and flow restrictor. These were last inspected in 2006/07 by GDC staff

which gives further detail under „Performance‟ in the Te Karaka: Reticulation section of this

document.

WTWS Reservoirs, Dams and Other Storage Facilities

There are no storage facilities or reservoirs in this system other than those privately owned that this

service supplements. 1 tank exists for the sole use of the rural fire service at 6 Ngawari Place.

The size of private storage varies but is generally 22 cubic metres (5,000 gallon)

The condition of the private tanks vary any leaks are noted during regular property inspections and

addressed as required.

WTWS Reticulation






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Pipe Size

25 1710

38 340

50 635

Total Length (m) 2685

Pipe Fittings

Hydrants 0

Valves 10

WTWS Fire Fighting Capacity

The reticulation has insufficient to provide fire fighting flows and no hydrants are provided in the

reticulation system. One bulk fire storage tank exists underground at 6 Ngawari Place.

4.4 Current Costs and Funding Policy

Council has completed a rigorous examination of funding policy for all activities under its control. The

following funding mechanisms are promoted.

Funding Sources and Mechanisms;

100% Targeted Rates, to people connected to the reticulation system. (To those

who have availability but are not connected, charge 50 %.)

Commercial users and bulk users have a combination of Targeted Rate and

water charges.

Loans

Councils funding strategy is outlined in the Annual Plan and Long Term Financial Strategy.

Council‟s funding strategy for the water supply assets are:

Operations maintenance expenditure from specific uniform annual charge.

Rates are levied on a uniform charge for each property receiving the service.

Loss of service potential identified as catch-up is funded from specific uniform

annual charge in the same manner as the operations maintenance expenditure.

Capital expenditure is funded from either loan or renewal fund.

Depreciation is calculated in accordance with the requirements of Financial

Reporting Standards from the fixed asset register.

Fees and Charges Schedule of Fees and Charges

The following Fees and Charges apply to the Water Supply Activity:


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The Domestic Water Connection Fee for the first connection to an un-serviced property

for Water is $330 (inclusive of GST).

Metered water to commercial and industrial properties is charged at a rate set annually

by Council.

All other charges are covered by the rate strike. Rates for water are charged per

connected property. Properties able to be connected, but who choose not to be

connected are rated a half charge.

Standard plumbing and drainage charges for Building Consents apply.

Table L1

Fees and Charges for Water Supply

Fee or Charges Current Charge

(GST Exclusive) Comments

Connection Fee

(subsidised)

$300 + rate adjustment Individual lot first domestic connection.

Connection Fee Actual cost + 10% + rate

adjustment

Second domestic connection per lot or

commercial

Metre reading $0.805 per cubic metre Reading intervals based on quantity of

usage.

Policy and Procedural Implications

No policy or procedural matters are unresolved. As the funding method is reviewed this may require

some adjustment of Council policy. These adjustments will be included in later activity management

plans.

4.5 Key partners/stakeholders

To assist in the water, wastewater and stormwater activities the Gisborne District Council

has the following partnerships and/or special relationships to plan and deliver the activity.

Opus International Consultants – Professional Services Contract

To provide and assist the Gisborne District Council with professional services for design,

supervision, procurement and delivery for the activities of the wastewater, water supply and

storm water activities.

The Opus Team are to become an integral partner in the running of the three activities. This

will be formally through the professional services contract. The contract is more of a

„partnership‟ than any standard services contract and is currently part way through a review

at the time of writing this plan. That is expressions of interest have been received, assessed

and an initial discussion has occurred with Opus. The next step is to provide a memorandum

of understanding or similar and undertake working workshops to progress the partnership.

Opus would provide relevant expertise and technical experience within their local office and

provide a „window” into their experience and technical expertise nationally.

They also provide a best for project methodology and along with project and asset

management skills.


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Fulton Hogan Limited – Maintenance Contract

Fulton Hogan provides the services and maintenance of the stormwater, wastewater and

water supply assets for the Gisborne District.

Fulton Hogan is engaged to maintain the existing infrastructure at the designed capacities to

provide the agreed levels of service. They protect the community from the effects of failed

infrastructure and minimise or eliminate any health, safety and environmental concerns.

Fulton Hogan have a large local presence and cover the three activities on a 24/7 coverage.

Currently Fulton Hogan primarily maintains the reticulation and distribution of the water

network with GDC operators running the treatment plants and storage dams. Fulton Hogan

also maintains the collection, distribution and disposal of wastewater and stormwater

services. It is undecided at the time of writing this AMP if the new WWTP will be run by the

maintenance contractor. If it is not it would be run by a GDC operations team as currently is

the case with the water treatment plants.

Hydro-Technologies Ltd – Equipment Maintenance and Environmental Monitoring; Data

Management

Hydro-Technologies monitor resource consent compliance for all of Utilities resource

consents. They also undertake quality control monitoring which includes sampling and/or

analysis on ground water, surface water, soil samples, leachate, potable water, general

sewage and trade wastes. Reports are produced immediate for non compliances where

required and summary reports are produced as regular as on a monthly basis.

Areas for monitoring include but are not limited to – septage disposal sites, marine outfall

consent monitoring, bore consent monitoring, oxidation pond (Te Karaka) consent

monitoring, water supplies and compliance monitoring, tradewaste monitoring, and

calibration of rain gauges.

Environmental Health GDC – Water supplies action and reporting protocol

The Environmental Health section of the Gisborne District Council have a protocol document

which is primarily to assist the Utilities department in the operation and monitoring

requirements for the NZDWS within the water supply activity. The document sets out what to

do for any non compliances, exceedances and transgressions and what actions are to be

undertaken in particular situations. The population of the WINS database is undertaken by

the Environmental Health.

The following stakeholders do not hold any formal contract with the Gisborne District Council

but have in the past provided and assisted in the execution of the water and wastewater

activities. They continue to do this today.

Transfield (Napier) – Telemetry

Transfield provide Abbey System software and Scada support for wastewater and water

telemetry systems. It is intended that Transfield continue to be employed as required.

Operational Plans and Manuals – Mike Davidson


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Mike Davidison provides operational plans and manuals primarily for the operation of the

collection, treatment and reticulation of the water supply activity. Mike Davidson also has

produced various contingency plans, wastewater operational plans and manuals. It is

intended that Mike Davidson continue to be employed regularly as required.

4.6 Assumptions

Below are the significant assumptions made in preparing this Activity Management Plan:

The information provided has been developed from a sound base, the asset register being of

high quality and renewal projections risk based on pipe failure.

The accuracy of the valuations and the need to reassess valuations once the capital

upgrading programme is completed could affect the financial projections.

The renewal programme is based on a small condition sample. These inspections have

indicated that the assets are in good condition.

The financial information presented in this Activity Management Plan would also be affected

if Council chose to service towns not currently serviced, or to develop services to

accommodate a large industry in an area either currently unserved or with under-capacity

services.

The Water Engineer‟s best judgement has been used in preparing capital cost projections

with anticipated results from the preparation of the Public Health Risk Management Plans

and the outcome of the Water and Sanitary Assessments. Any significant change in the

desired Level of Service identified through these processes could impact on this Activity

Management Plan and these changes will be incorporated into the next review of this Plan.

In preparing this Activity Management Plan, it is assumed that the District Plan (which is

currently partly operative) will become operative without substantial modification to matters

that would affect the Stormwater network system.


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4.7 Risk Management

The water, wastewater and stormwater activities have had a significant number risk assessment and

management documents undertaken in the past. The following is a list of these documents from

2006 onwards –

Report Name Author Date Company

GDC Risk Management - Stormwater Reticulation Tim Crook 19-May-

98

Gisborne District Council:

Legal Team

GDC Risk Management - Sewerage Reticulation Tim Crook 16-Jul-

98

Gisborne District Council: Legal

Team

GDC Risk Management - Sewerage Treatment &

Disposal Tim Crook

16-Dec-

98


Team

GDC Human Health Risk Assessment for the

Wastewater Outfall EGIS Consulting Sep-99 EGIS Consulting Australia

GDC Risk Management - Water Supply Pipeline Gordon Brock 19-May-

98


Team

GDC Risk Management - Dams & Storage Reservoirs Kristen

Mcpherson

28-Sep-

98


Team

Public Health Risk Management Plan – Gisborne Water

Supply Helen Churton Feb-08 OPUS Consulting

Public Health Risk Management Plan – Te Karaka

Water Supply Marlis Haertel Feb-08 GDC

Public Health Risk Management Plan – Whatatutu

Water Supply Marlis Haertel Feb-08 GDC

Volcano-Hydrologic Hazards in the Waipaoa Catchment V Manville Jul-04 Institute of Geological & Nuclear

Sciences Ltd

GDC Emergency Management Response Plan for Bulk

Water Pipeline Failure Mike Davidson

1-May-

08

Quality System Consulting

Services

GDC Risk Management – Plant & Motor Vehicles Tim Crook 7-Apr-99 Gisborne District Council: Legal

Team

GDC Risk Management – Staff & Industrial Relations Kay Ligget 16-Mar-

99


Team

Gisborne District Civil Defence & Emergency Services

Volcanic Contingency Plan Unknown Dec-06 GDC

GDC Emergency Management Plan – Water & Waste Mike Davidson Feb-08 Quality System Consulting

Services

The documents below have been listed as they were produced as part of the risk portfolio. However

these documents provide information on types of risks rather than being a formal risk assessment

and management document.

Risk Information

Documents

Name Author Date Subject

Kaharoa Eruption

Hazards Workshop Environment B.O.P.

12

October

2003

A Regional Volcanic Contingency plan

for a Kaharoa eruption.

National Civil Defence

Emergency

Management Strategy

Ministry of Civil

Defence

August

2003 Proposal for discussion

Guidelines for Action American Public August Public works role in emergency


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Works Association 1998 management

Lifeline Utilities &

Emergency

Management

Ministry of Civil

Defence

December

2002 Directors guidelines for lifeline utilities


Emergency

Management

Ministry of Civil

Defence

December

2002 Information for lifelines utilities

Lifelines Co-operation

Study for Water Supply Carson Group NZ

October

1998

Investigate developing a voluntary

agreement between Water authorities

(nationally) for supplying assistance to

another authority who suffers major

infrastructure damage from a natural

disaster

Civil Defence Report

97/5

Institute of

Geological &

Nuclear Sciences

report

May 1997

The impact of recent falls of volcanic

ash on public utilities in two

communities in the United States of

America

Risk & Realities Canterbury

University 1997

A multi-disciplinary approach to the

vulnerability of lifelines to natural

hazards.

A summary document broken down into each activity and then detailing corresponding reports has

been attached as Appendix D. Also included in the attachment is a list of „counter measures‟ and

„improvement plans‟ compiled from each of the individual reports.

Every „counter measure‟ and „improvement‟ from the documents above has been considered when

creating the improvement plan section of this Activity Management Plan.

Water

There are a significant number of water risk assessment and management documents that have

been completed within the past year. These documents are substantial documents and have had

significant input from existing GDC staff and technical experts. It is not intended to undertake any

new risk assessment documents for the water activity in the near future as the improvement plan

component of the existing documents will take significant time and resources to work through. The

plan will reviewed as required by the Ministry of Health.

Private Water Supply Systems

Council has identified, as part of the Three Waters Assessments Consultation, that there are

accepted health risks associated with the provision of Water, Wastewater and Stormwater and that

the rural communities do not wish the Council to increase Levels of Service to reduce these risks.

Due to the costs associated with the development works owned and managed by Council the

community does not favour implementation of council capital works that would reduce the health

risk.

4.8 Negative effects

The potential significant negative effects of the water supply activity are:

Environmental - the effects on the environment of discharges of chlorinated water from

maintenance activities or pipeline failures.


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Social - Health and safety risks associated with the construction, maintenance or operation

of the water supply infrastructure. Property damage resulting from mains failures. Damage to

some household hot water valves caused by corrosion by-products within galvanised iron

rider mains and service connections.

Cultural - no potential significant negative cultural effects have been identified for the water

supply activity.

Economic - the economic cost to the community as a result of property damage resulting

from mains failures and corrosion by-products within the water supply.

Council mitigates these potential negative effects by a mix of asset management planning activities

including:

Asset development work.

Monitoring and testing.

Demand management initiatives.

Public education, including water conservation programmes.


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5. Where we want to be

5.1 Growth

Population in the serviced area is projected to remain fairly constant over the lifetime of the

Community Plan. Notwithstanding, up to around 1000 additional residential units are projected in

association a declining average household size. „Greenfield‟ residential development is projected to

continue to occur in areas around the city, such as the Taruheru Block. Some intensification is also

projected in existing residential areas. Heavy Manufacturing, Other industry Servicing,

Accommodation and Bars, Restaurants and Cafés and Residential Services (aged care facilities) are

to experience growth over the period, while Education and Health and Community Services are

projected to decline.

The growth projections used in this discussion are from the Gisborne District Council Growth Model

2008 and are for the period 2006-2021, which is just beyond the ten-year period of the Long Term

Council and Community Plan.

Residential

The growth model suggests that residential growth will be confined primarily to the Gisborne Urban

Area (GUA). In the rest of the District the number of households is projected to increase only slightly.

The growth model 2008 also suggests locations throughout the Gisborne Urban Area where the

residential growth will be more significant than in other areas. The more substantial residential

growth areas are –

Location

Estimated

household

numbers

2006

Projected

household

numbers

in 2021

Increase

in

household

numbers

from

2006 to

2021

Predominately Greenfields

1 Riverdale A (Taruheru Block) 265 403 138

2 Makaraka A (Taruheru Block) 27 155 128

3 Wainui 589 709 120

4 Matokitoki B (Glenelg Corner) 93 188 95

5 Makaraka C 157 228 71

Predominately Infill

6 Gisborne Central 1328 1511 183

7 Mangapapa 1600 1769 169

8 Whataupoko 1479 1629 150

9 Te Hapara 1716 1800 84

10 Kaiti South 965 1035 70

Comments on the above residential growth areas are –

1 & 2) Riverdale A and Makaraka A


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These two areas make up the Taruheru Block. This area is the most significant area of

“Greenfield” growth in the Gisborne Urban Area. The main town bulk supply pipes run along

the outside boundary of this area. This means that the impact on the water infrastructure is

primarily limited to the area serviced. The larger transfer mains required to maintain

appropriate service to the new area have been identified and sized through hydraulic

modelling and incorporated in to the Taruheru Structure Plan.

3) Matokitoki B (Glenelg Corner)

A feasibility study was undertaken for extending wastewater reticulation from the city as far

as the adjacent rural residential area between Matokitoki B and the city. However the

Council decided that onsite wastewater systems would continue to be used for any

development in this area. Logically the area will therefore also remain serviced primarily by

on-site water collection systems. This is because provision of a reticulated water supply (even

restricted) to this area would have a detrimental effect on on-site wastewater systems given

the high water table and some poorly drained soils. Therefore extension of water reticulation

as far as Matokitoki B is not anticipated.

4) Makaraka C

There is one large proposed subdivision in this area currently known as Citrus Grove. A

diameter 300mm main to provide water to the western industrial area is proposed to go

through this land. Alignment is subject to confirmation. Water could potentially be supplied

from this. However on-site water supply would probably be required for any lifestyle block

developments. Existing infrastructure should be capable of accommodating development

elsewhere in Makaraka C.

5) Wainui

The reticulation of the Wainui, Okitu, Sponge Bay area with water and wastewater was

pursued this year through the special consultative process in the LGA. After four days of

submissions being heard a resolution was agreed to not proceed with reticulation. This

means that the all but the 95 Lot subdivision in Sponge Bay, which is part way through

construction, is to be serviced by onsite wastewater systems and predominately roof water.

The Sponge Bay subdivision is to pay a financial contribution covering any upgrade works

required in the existing wastewater and water systems.

The upgrade of portions of the bulk mains from Ormond Road to the Knob Hill reservoir, new

pipes in the vicinity of the existing reservoir and a new pump station is proposed to enable

full mains supply development. It is proposed to undertake this work before all buildings on

this and the proposed development on the „Kaiti Blobs‟ land in Kaiti South are completed.

6, 7, 8 &9) Gisborne Central, Mangapapa, Whataupoko and Te Hapara

These areas are well facilitated with larger water mains running through these areas. Given

the relatively small increase in demand due to residential growth, and the likely spread of

development, it is expected that existing infrastructure should be able to cater for the

proposed growth. Local area upgrades only may be required. The hydraulic Model will be

updated regularly to check on this as new subdivisions occur.

9) Kaiti South

This area will have improved service due to the upgrade works proposed for Sponge Bay and

Kaiti South developments. This coupled with the relatively small increase in demand due to

the population growth and the likely spread of development means that only local upgrades

may be required. The hydraulic Model will be updated regularly to check on this as new

subdivisions occur.


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All local area upgrades will be identified on a case by case basis and sub-divisional support funds

from DC‟s would be utilised for this work.

Non Residential

The growth model projects a growth of 41,000m2 in the Gross Flood Area (GFA) of non-

residential activities. Using standard equivalence factors based on estimated typical daily

demands, this equates to about 180 „household unit equivalents‟ (HUE) of growth. The

most significant growth areas are –

Location

Estimated

GFA 2006

(m2)

Projected

GFA 2021

(m2)

Increase

in GFA

between

2006 and

2021

(m2)

Approx.

Increase in

HUE

Predominately Greenfields

1 Tiniroto A and Makaraka D (Western

Industrial Area)

40,686 56,647 15,961 36

Heavy Manufacturing 38,292 45,354 7,062 16

Warehousing 101 478 377 1

Other Industry/Servicing 2,293 10,814 8,521 20

Predominately Infill

2 Gisborne Central 385,798 394,992 9,194 42

Commercial (Other) 96,254 101,168 4,914 16

Visitor Accommodation 12,834 15,298 2,464 13

Restaurants, Bars & Cafes 16,346 17,821 1,475 22

Retail 91,134 92,823 1,689 3

Other 169,230 167,882 -1,348 -12

3 Gisborne Airport B (Industrial) 100,637 105,977 5,340 14

Heavy Manufacturing 237 2,591 2,354 5

Warehousing 6,103 6,480 377 1

Other Industry/Servicing 93,737 96,198 2,461 6

Other 560 708 148 2

Comments on the above residential growth areas in respect to the wastewater activity are –

1) Tiniroto A and Makaraka D (Western Industrial Area)

The growth model projects some 16,000m2 growth in the GFA of non-residential activities in Tiniroto

A and Makaraka D (the Western Industrial Area) between 2006 and 2021. This represents a growth

in GFA of 39%. All of the projected growth is in Heavy Manufacturing, Warehousing and Other

Industry and Servicing activities. The growth is equated to only 36 „household unit equivalents‟

according to the standard equivalence factors. However actual demands may be more significant

due to the conservative nature of these equivalence factors.


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There is a project, Western Industrial Ring Main, to lay a new pipe from Makaraka to increase the

capacity and provide an improved fire-fighting service to the Western Industrial Area. The project has

been delayed due to land access and confirmation of alignment of the main. The horizontal and

vertical alignment must ensure that the water pipes have adequate protection but that depth is not

excessive. Excessive depth could cause long term significant maintenance issues. It is expected that

this alignment will be finalised and the water pipe laid in year 2009/10. There is currently only

minimal spare capacity in the existing water main servicing this area and, until the main is

constructed, minimal development can occur. Growth has been limited in this area to date and this

deferral of the project has not caused issues.

Existing properties have paid a water fee based on their demand as a contribution to the installation

of the existing water main. This will have to be readdressed when the new Western Industrial Ring

Main has been completed.

Developments requiring a higher fire fighting service than the planned service will be required to

install onsite storage and pumps.

2) Gisborne Central

Growth of about 9,200m2 in the GFA of non-residential activities is projected in Gisborne Central

between 2006 and 2021. This represents a growth of 2% in GFA and equates to about 42

„household unit equivalents‟ of growth, in addition to the 183 households projected over this period.

Existing infrastructure should be capable of accommodating this growth, with the possibility of some

local upgrades. The hydraulic model will be updated regularly to monitor capacity. Subdivision

support funds from development contributions will utilised if upgrades are required.

3) Gisborne Airport B (Industrial)

The growth model projects a growth of about 5,300m2 in the GFA of non-residential activities in this

area between 2006 and 2021 (5%). This equates to only 14 „household unit equivalents‟. However

actual demands may be more significant due to the conservative nature of these equivalence

factors. Existing infrastructure should be capable of accommodating this growth.

5.2 Trends

Climate Change Trends

One significant issue facing the region in the future and in the face of climate change will be access

to and allocation of water. The demand for water will be affected by the climatic changes affecting

soil moisture levels and the supply of water will be affected by changes to rainfall and the

subsequent runoff to streams, recharge to aquifers and through roof-top collection systems.

The current insignificant growth projection for the Gisborne region does not appear to put more

demand pressures for domestic water. It is more difficult to predict the commercial demand given

that there will be changes in industry trends. There will also be changes in agricultural and

horticultural demand driven by both climate change and changing land use patterns.

Peak daily water demand in Gisborne is usually at the end of an extended dry, hot spell of 10 days or

more. If such events increase with climate change, then the number of peak days can be expected to

increase.

Natural resource: surface and groundwater

Key climate variables: average rainfall (monthly, seasonal, annual)

Climate change effects: decreased rainfall in the north and east of New Zealand


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Key risk: decreased security of water supply

Uncertainty: average decreases in rainfall appear more likely in the east of New Zealand

The following trends due to climate change have been extracted from the MfE document ‘Preparing for climate change - A guide for local government in New Zealand’ published in July 2008. These are largely influenced by predictions of changes in rainfall and temperature. The possible effects of climate change on water infrastructure will be associated with:

Possible larger variations in water volumes.

Reduction in the quality of the raw water sources.

Sedimentation in the source rivers (Te Arai and Waipaoa) and weed/algae growth in the source dams (Williams, Clapcott and Sang).

Changes in type/distribution of pest species.

Economic Trends

The predicted economic trends relating to the operation and maintenance of the Water Supply Utility

are summarised below as they relate to the various aspects of the service.

Price increases have largely been a product of transportation (price of oil) and power increases.

There have been significant price increases in products as the global demand for steel and

petroleum based products, furthermore the cost of transportation and electricity has increased. For

August 2008 to July 2009 the following price increases in materials are expected:

Modified plastics (PVC, ABS, MDPE ect.) 20 - 30%

Treatment chemicals (Chlorine, PACL, HFA, Lime) 12 -15%

Concrete prices (Reinforced concrete pipes) 10-15%

Cast iron and ductile iron products have increased 20 -30%

Technology Trends

The following technological changes are expected to impact on Water Supply network management

and practices.

Advances in pipeline renovations including trenchless technologies.

Continued use of hydraulic modelling, including model calibration.

Leisure Trends

No Leisure trends have been identified in this Activity Management Plan. Leisure trends that may

impact on the Water Supply Utility will be revisited and investigated for the next Activity Management

Plan.

Social Trends

No Social trends have been identified in this Activity Management Plan. Social trends that may

impact on the Water Supply Utility will be revisited and investigated for the next Activity Management

Plan.

Demand Management

The capacity of the current public potable water supply system is sufficient to meet the existing

future-projected needs; however the demand for the system to service large industrial operations

and the servicing of residential areas can put significant pressure on the water available especially

during summer evenings. Much of this water is being used for garden irrigation and this puts

pressure on the existing water supply, treatment and reticulation network.


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Future Demand Management Approach

The future demand management approach centres on the Demand management Plan in this section

of the Activity Management Plan.

The objective of the demand management plan is to:

Reduce water demand

Adopt all reasonable and practicable measures to achieve an efficiently operated system

To eliminate any sources of identified leakage

Definitions relating to Demand Management of the Water Supply include:

Term Definition

Unaccounted for Water The difference between the amount of water supplied from the

treatment plant to the consumer (via water meter) and measured

water use (hydrant use, mains flushing, etc)

Actual Water Loss Water loss due to leaks and illegal draw off

Night Time Flow The amount of demand during the night (1am – 4am) over and above

the minimal consumption anticipated. This indicates possible leakage

in the network

Non-Asset Solution A solution that does not involve altering or repairing the water supply

asset to reduce water consumption

Demand Management A plan to reduce total water use and promote water reuse both by the

consumer and more efficient network operations

Demand Management Plan

The Demand Management Plan involves implementing strategies to minimise the loss of water in the

water network. These strategies involve altering or repairing the asset to achieve the target. The loss

minimising strategies used by Gisborne District Council are outlined in Table below.

Table– Demand Management Loss Minimising Strategies

Strategy Description

Leak Detection A proactive Leak Detection programme ensures the percentage of

treated water lost through leakage is minimised.

Response Time Prompt response and rectification of reported leaks

Replacement /

Rehabilitation

Programme

The Renewal Programme as described in this plan to ensure

assets are not utilised beyond their useful life when the risk of

unidentified failure and leakage is greatly increased

Code of Practice Enforcement of the Engineering Code of Practice to ensure all

maintenance is carried out to the relevant standard

Technical Standards Ensuring new assets are constructed to the correct standard and

tested before being put into commission as specified in this plan

Standard Materials The use of standard (high quality) materials as specified in this

plan

Quality Audits To ensure all standards above are being met

Network Model The analysis of the network model to indicate areas where

consumption is higher than anticipated to focus leak detection

programmes


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The Demand Management Plan also involves implementing non-asset strategies to manage the

demand for a service. Non-asset solutions used by Gisborne District Council are outlined in the table

below.

Demand Management Non Asset Strategies

Strategy Description

Water Conservation /

Public Education

Encouraging Water Conservation through public education and

advertising campaigns

Water Restrictions Water Restrictions are used as a necessary tool to reduce peak

demands that are unable to be met by the current system.

Water Metering Water Metering and invoicing of consumption increases

consumer‟s awareness of water use and therefore reduces

unnecessary water use.

New Domestic

Technology

Encourage the adoption of new technologies in the home such as

low flow showerheads and dual flush toilets

Sustainable Development/Operation

Sustainable development takes into consideration the impact on the environment of the activity of

humans as we develop the environment we live in to suit our wants and needs.

Therefore, Gisborne District Council encourages sustainable development and minimising the impact

on the environment is minimised through the following strategies:

Operating the treatment plants efficiently to minimise backwash discharges

Further issues and strategies will be developed following the Water Assessments and included in the

next revision of this Activity Management Plan.

Monitoring of Demand

The reticulation is monitored for performance relating to water consumption by:

Comparison with the network model for pressure loss areas and potential leakage

Industrial consumption is monitored via water meters

Average household consumption is calculated as a desktop exercise

Illegal connections are monitored for during routine maintenance

This data is analysed periodically to indicate trends in consumption and identify target areas in the

reticulation for leak detection and programmed maintenance.

Network Model

A network model is employed to simulate water network from source to consumer. This is done by

creating a model of the network complete with attributes such as pipe diameter, material and

hydraulic grades and then adding demand at points throughout the network to simulate domestic

and industrial demand. These demands are configured to mimic how demand occurs throughout the

day with peaks in morning and evening and lows at night.

Opus international Consultants Ltd has completed development of the model for Gisborne District

Council.

A network model is useful for:

The design of new systems

Assessment of network capacity

Compliance with fire fighting regulations

Design for optimising pressure zones within reticulations to reduce water losses

Investigations of pumping times to save costs.

The model,


n-49637 Page 60

The current water model is being continually updated as changes to the network occur such as

renewals and upgrades or as changes to asset attributes are identified, however to confirm its

accuracy the model is yet to be calibrated. The calibration takes place by taking field measurements

from flow meters out of reservoirs and key locations and pressure monitoring throughout the

reticulation.

Capital Works resulting from Demand Management

As a consequence of the demand management issues installation of universal water metering for

Gisborne City is programmed pending Council‟s decision. This is only one method in which demand

management can occur as finalisation of the most preferred method will be deduced after the

establishment of a Demand Management Plan (see Sections 6: Options and Choices and 7:

Improvement Plan). Universal Metering will enable accurate identification of unaccounted for water.

Targeting reduction of and measuring of unaccounted for water will then be possible.

Implementation / Improvement Plan

The strategies employed for the demand management plan will be continually updated as new

technologies become available.

Following the installation of universal water metering in Gisborne City the demand management plan

will be reviewed to include the additional data this makes available to engineers for the tracking and

analysing of water demand.

Renewals, Capital Expenditure and Depreciation

It should be noted that currently the remaining economic life is the primary driver for replacement of

an asset. It is intended to develop a more detailed framework for the application of the Advanced

Asset Management factors. This will be developed for future revisions of this Plan.

Renewal works identified in terms of the renewal strategies may be deferred if the cost is beyond the

community‟s ability to fund. This can occur when higher priority works are required on other

infrastructural assets, or there are short term peaks in expenditure, or if an inadequate rating base

exists.

It is recognised that the deferral of some items of work will not impede the operation of the assets in

the short term, however to continue to defer renewals is to create a liability and increase the risk of

asset failure to the point where levels of service cannot be maintained.

When renewal work is deferred the impact of the deferral on economic inefficiencies and the

system‟s ability to achieve the required service standards will be assessed.

This funding renewal profile varies from the asset renewal profile as detailed in Appendix X (available

on request).

This variation has occurred due to:

• The implementation of Advanced Asset Management Techniques since renewal expenditure was

promoted.

• Revaluation of assets has occurred since renewal expenditure was promoted.

• Adoption of BERL indices as a basis for inflation.

• Balancing renewal expenditure with financial availability on a corporate scale.

This variation in the next three years is minor. Variations outside this window will be reviewed at the

next review of the Activity Management Plan.

Table 12 compares the forecasted renewal requirements and the ability of depreciation funds for the

next 10 years.


n-49637 Page 61

The Future Asset Development Approach

Capital works are those works that create a new asset that did not previously exist, upgrade or

improve an existing asset beyond its previous design capacity.

Assets are acquired as a result of:

Taking over new reticulation constructed with subdivisional development (constructed at the

developer‟s expense).

Extensions constructed by Council to service new areas.

Asset upgrading constructed by Council to:

o provide additional system capacity to overcome inadequacies in level of service or

provide for growth, for example larger pipes, pumps, and treatment capacity

o meet new standards, for example additional treatment facilities to remove

cryptosporidium and giardia

o meet legislative requirements such as hydrant flows.

Creation/Acquisition Plan

The water supply systems will be developed to meet community expectations, technical and

environmental standards and growth projections over the next 20 years.

New works are identified on the following basis:

Regulatory - expenditure needed to meet new regulations, for example modified resource

consents as a result of Resource Management Act or water quality requirements.

Consumer demand.

Growth - ability to meet the most likely demand projections.

Operation efficiency - to reduce costs and improve efficiency.

The selection criteria for the prioritising and programming of asset development projects is a

function of Council preference, consideration of risk, costs and benefits, affordability and ranking

with other projects.

Project approvals will be supported by an economic appraisal using cost/benefit analysis techniques

which take into account:

Capital costs of various options.

Any change in net annual operating costs.

Any change in annual maintenance requirements.

Any salvage value of existing assets or components.

Within a subdivision the developer shall meet Council standards and specifications. On satisfactory

completion the public portion of these assets will be vested in the Council.

Creation/Acquisition Standards and Specifications

Council standards and specifications for the construction of assets will reflect the best current

technologies, national standards and legislative requirements. All new water assets constructed by

Council or acquired from subdivisions or developments will be built in accordance with the Gisborne

District Council Engineering Code of Practice.

The Code of Practice is due to be updated in 2008/09 updated to incorporate relevant experiences

and changes in best practice and will form the technical basis of all development and renewal

contracts.

Once new projects / capital expenditure is identified it is promoted to the Corporate Management

Team who assess the proposed projects along with other corporate spending. Projects are there

assessed as to feasibility and affordability in consideration of all Council activity. The priorities listed

below are those projected promoted for the coming 10 years, the Future New Capital Works


n-49637 Page 62

Programme shows those items approved through the management team for final adoption by

Council.


n-49637 Page 63

6. How we plan to get there

6.1 Options and Choices

Options have been considered in this section only for a specific project selection. These projects

have been selected for discussion as they are judged to be the most significant in terms of their

impacts on the following issues:

Financial

Cultural

Environmental

Social

Potential for the project to have a significant community profile

The Capital Works Programme and specific operational projects are being developed in accordance

with the Local Government Act 2002 requirements. This will be a structured process that ensures all

alternative options are considered, justification for the works is recorded, and the consequences of

not undertaking the work are assessed.

A complete list of the proposed projects for the water activity is included in Appendix C: Financial

Information.

Although renewals are a significant financial item options have not been considered for them.

Renewals are required to maintain the integrity of the water supply asset. If renewals are delayed

eventually emergency repairs will need to be carried out on the asset. These will likely have a higher

relative cost of carrying out the renewal and at greater inconvenience to the community. Planning of

renewals creates opportunities for contractors to better price, notify and plan work. Therefore it is

crucial that all of the renewals as included in the budget are proceeded with.

Options for subdivision support projects have also not been considered. Allowing for predicted

growth at the time of the subdivision is always going to be the most prudent option as the other

options would be do nothing or to attempt to get the developer to upsize for future growth. The

former would mean excavating twice, double-up of infrastructure and disposal of relatively new

assets. The latter would be unfair, illegal and would stifle some subdivisions altogether. Subdivision

support will result in the extension of the existing asset.

DWSNZ:2005 Compliance Projects

CAPEX Project – CX5 & CX6

Rural Townships: Te Karaka and Whatatutu Water Supply Upgrades (subject to CAP funding)

Urgent need for Water Supply upgrades as identified in the PHRMP documents. These upgrades aim

to improve the water quality both treatment wise and aesthitically, satisfy the Protozoal compliance

criteria of the DWSNZ:2005 and reduce maintenance costs attributed to the current setup. Project is

subject to a successful Capital Assistance Program (CAP) grant by the Ministry of Health.

Feasible options:

Provided a Ministry of Health funded Capital Assistance Program (CAP) application is

successful; design, build and commission a new water treastment facility and carry out

improvements on the water supply system

Do nothing/Status quo: Continuation of non compliance with DWSNZ:2005 and high

operational and maintenance costs due to a high breakdown rate. .


n-49637 Page 64

These budgets are based on cost estimates by GDC staff from the PHRMP Improvement Plans.

95% of the funding for these projects is most likely to come from the CAP grant from the Ministry of

Health due to these communities being classed as 10 (the highest possible) on the Drinking Water

Assistance Programme Deprivation Index. A score of 10 is regarded as “a supply most likely to

receive CAP funding‟. The remaining 5% will have to be loan funded.

CAPEX Project – CX4

Distribution: Hospital Hill Chlorine circulation improvements

According to the PHRMP risk assessment, Hospital Hill Reservoir has stratification and mixing issues

with Free Available Chlorine (FAC) because of its volume and the inlet halfway up the wall. This has

been identified as “extreme” in the priority scoring because of the potential for Bacterial Non

Compliance in the DWSNZ:2005.

This project aims to produce a solution for poor Chlorine circulation. On completion, this solution will

aid in improving the lateral and vertical circulation of the water and inhibit stratification issues which

have an adverse effect on the accuracy of Chlorine testing and .

Feasible options:

Study, design and construct a process and/or device that will effectively and efficiently mix

the volume of water within each Hospital Hill Cell.

Do nothing/Status quo: Leave system as is and accept risks associated with current

situation. Risks include potential DWSNZ:2005 Bacterial Non compliance.

This budget is based on cost estimates obtained from a report by OPUS Consultants who followed up

recommendations from the PHRMP Improvement Plans.

Demand Management Planning Projects

On deciding on the best option for effective demand management planning the establishment of a

Demand Management Plan (OPX16) must initially be completed. If application for funding is

successful, this is programmed for 2009/10. This will then determine what approach will be taken

and will finalize the best method/s for effective demand management.

In this section there are two CAPEX projects (CX8 & CX9) that will improve security of supply which

will have a positive demand management effect on the Water Network. These are the only options at

this stage as we have more confidence in pricing these projects. As previously stated, when the

Demand Management Plan is established, other options may eventuate and the best method/s will

be determined.

OPEX Project – OPX16

Water Utility: Establish Demand Management Plan

Establish a Demand Management Plan to provide standard protocols/procedures and a programme

which will have a positive demand management effect on the Water Network. This project aims to

plan for future demand/capacity for growth, avoid unnecessary upgrading or installation of assets by

developing a most cost/benefit effectiveness programme and increase the level of security of supply

for the Water Network.

Feasible options:

Develop and implement a Demand Management Plan for the Water Supply System.

Develop and implement a Demand Management programme and recommend best projects

taking costs/benefits into consideration.

Do nothing/Status quo: Leave issues as is and accept risks and costs associated with the

current situation. Risks include lack of planning for future demand, unnecessary upgrading


n-49637 Page 65

of raw and treated storage water, no increase in security of supply and no provision for

capacity for growth.

This budget is based on cost estimates obtained from a report by OPUS Consultants whom followed

up recommendations from the PHRMP Improvement Plans.


Distribution: Universal Metering

Universal metering for domestic consumers could be implemented as one of several demand

management tools for the Water Network. This project is a highly successful water conservation and

demand management tool which aims to reduce the risk of having to upgrade storage facilities,

increase the security of supply and will provide capacity for growth.

Feasible options:

Install meters on all domestic and commercial connections on the Water Reticulation

Network. It will also involve replacement of older style Toby manifolds that aren‟t compatible

with the model of water meter chosen for mass installation.

Approve a different demand management project in place of this which may be cost

effective.





This budget is based on a calculation of current installation costs (Fulton Hogan Ltd) and the number

of connections which need water meters to be installed.


Waingake Catchment: Williams Dam Storage increase

The increase of storage capacity in the Williams Dam could be implemented as one of several

demand management tools for the Water Network. This project has the capability to provide capacity

for growth and offer an increase in security of supply at the source by ensuring all practicable steps

are taken to reduce the risk of restricted or loss of supply due to high consumption and low rainfall

(as occurred in autumn 2007).

Feasible options:

Design and build an extension on the 'Morning Glory' overflow. Carry out project according to

the recommendations noted in the Mangapoike Dams Safety Review Report by OPUS

Consultants Ltd and any future design specifications.

Approve a different demand management project in place of this which may be cost

effective.





This budget is based on cost estimates obtained from a report by OPUS Consultants who assessed

all three Dams on their current state and condition. From this, recommendations and price

estimates were made and included this project.

Strategic Asset Management Projects



n-49637 Page 66

Waingake Catchment: Clapcott Dam supply main replacement

Currently, peak demand flows solely from the Clapcott Dam are not being achieved due to hydraulic

constraints of the 300mm dia. supply main between the dam and the Damline Pumpstation.

To allow an even use of the Williams and Clapcott Dams and greater versatility of the different

source supplies the installation of a larger pipeline is required. This project has been identified as a

medium priority in the PHRMP risk assessment process.

Feasible options:

Install a 450mm pipeline from Clapcott Dam Intake Tower to the junction with Williams Dam

pipeline (approx 600m).

Do nothing/Status quo: Leave issues as is and accept risks associated with current situation.

This budget is based on cost estimates obtained from a report by OPUS Consultants whom followed

up recommendations from the PHRMP Improvement Plans.


Water Utility: Asset Componentry Condition Assessment & Renewals Program. 1 FTE for

24months

Budget for 1 FTE for 24 months to facilitate the condition assessments and renewals programme

needed to satisfy NZ equivalent to International Accounting Standard 16 (NZ IAS 16). More

effectively predict and allow for failing infrastructure.

Reasons for project:

Allow for 1 FTE for 24 months for the development and facilitation of condition assessments

and a renewals programme. Compliance with accounting standard NZ IAS 16.

Feasible options:

Approve budget for the required work to take place.

Do nothing/Status quo: Disregard condition assessment and renewals programme. Asset

componentry project is not carried out.

Figures for budget????

SNZ PAS 4509:2008 Fire Fighting Compliance Projects


Distribution: Fire Fighting Upgrade

In order to satisfy the Firefighting Code of Practice:2008 requirements of meeting the minimum

flows from hydrant and also provide capacity for growth, upgrades to selected sections of

watermains need to be carried out.

As a design and programming prerequisite, calibration of the Hydraulic Water Model needs to occur

first. This has been programmed as an OPEX project (OPX15, see Appendix C for information) for

2009/10 and finalize the sections of watermains for upgrades.

Feasible options:

After calibration of the Hydraulic Water Model, upgrade water mains identified by the

modelling process to meet the Firefighting CoP:2008.

Do nothing/Status quo: Leave system in its current state and accept the non compliance

with Firefighting legislation.


n-49637 Page 67

This budget is based on cost estimates obtained from a report by Beca Stevens but as previously

stated, the number of upgrades required and the total project cost will be finalized by the Hydraulic

Water Model.


Bulk Distribution: Western Industrial Ring Main (In previous LTCCP)

The construction of a new water main between Makaraka and the Awapuni Rd water main needs to

occur to satisfy the Firefighting Code of Practice:2008 requirements of meeting the minimum flows

from hydrants and also provide capacity for growth,.

Originally programmed for 2007/08, it was delayed due to accessibility issues over private land and

is now likely to occur in 2009/10. Although postponed, it still aims to meet firefighting legislative

requirements, increase the level of service in the Western Industrial Area and provide capacity for

growth. When installed, we have confidence that all these factors will be achieved.

Feasible options:

Design and construction of pipeline which creates a ring main situation by joining the end of

the racecourse water main to the Aerodrome/Awapuni Rd water main.

Do nothing/Status quo: Leave system in its current state and accept the non compliance

with Firefighting legislation.

This budget is based on a Tender evaluation obtained by OPUS Consultants , which included the

contract price, contingencies, design, supervision and GDC on-costs.

Asset Maintenance Projects


Bulk Distribution: Te Arai Pipe Bridge repairs

Acccording to conditions assessments carried out by OPUS, the Te Arai Pipe bridge has had damage

incurred in the past during flooding events. This project aims reduce the risk of bridge failure

Feasible options:

Carry out recommendations made by OPUS in the Structural Inspection Report of Feb 2006.


current situation.

This budget is based on cost estimates obtained from the OPUS Structural Inspection Report of Feb

2006.


Distribution: Hospital Hill Reservoir Waveband (Design and built 5 year priority)

Hospital Hill Reservoir is subject to a large amount of damage to the waveband during a significant

earthquake. When this occurs, replacement is needed which has a large cost associated. Project is

to design and build a waveband that will be less subject to damage, which poses the risk of vermin

contamination.

Reasons for project:

To reduce the repair/replacement costs after an event that causes the Waveband to fail. To become

more financially sustainable.

To reduce the risk of contamination from vermin entering the potable water stored in Hospital Hill

Reservoir after an event which causes the Waveband to fail.

Feasible options:


n-49637 Page 68

Design and build a Waveband that when an event for its design use occurs (predominantly large

earthquakes), it will be subject to less damage and in large part, be reusable. This subsequently

reduces the repair/replacement cost and contamination risk.

Do Nothing/Status quo: Replace Waveband failures on an 'as required' basis according to the current

specifications.

This budget is based on cost estimates obtained from the Structural Inspection Report Roy Taylor

Concrete Tank Consultants from April 2008


n-49637 Page 69

6.2 Implications

Project Community

Outcomes

Strategy and

policy

Levels of

service Financial Forecasts Funding Policy

DW

SN

Z:2

00

5 C

om

pli

an

ce

Pro

jec

ts

Te Karaka WS

upgrades

(subject to

CAP funding)

Safe and

Health Haven

Public Health

Risk

Management

Plan

Statutory

Compliance,

Maintain

LoS

Upgrades will create a greater

efficiency in the operation of this

system; therefore, the current

operational budget should be

sufficient.

Funding for up to 95% of the

$250,000 total is available

through the Ministry of Health

Capital Assistance Program

subsidies. Council is currently in

the application process.

Council will need to fund the

remaining money which is most

likely to be 5% of the $250,000

total.

Whatatutu WS

upgrades

(subject to

CAP funding)

Safe and

Health Haven

Public Health

Risk

Management

Plan

Statutory

Compliance,

Maintain

LoS





sufficient.

Funding for up to 95% of the

$250,000 total is available

through the Ministry of Health

Capital Assistance Program

subsidies. Council is currently in

the application process.

Council will need to fund the

remaining money which is most

likely to be 5% of the $250,000

total.

Te Karaka

Water Supply

Improvements:

Design and

Supervision

(subject to

CAP funding)

Safe and

Health Haven

Public Health

Risk

Management

Plan

Maintain

LoS

Further funding for this project is

not necessary as design and

supervision is only required for the

life of completing installation of the

upgrades.

Will be loan funded.

Whatatutu Safe and Public Health Maintain Further funding for this project is Will be loan funded.


n-49637 Page 70

Project Community

Outcomes

Strategy and

policy

Levels of


Water Supply

Improvements:

Design and

Supervision

(subject to

CAP funding)

Health Haven Risk

Management

Plan

LoS not necessary as design and

supervision is only required for the

life of completing installation of the

upgrades.

Hospital Hill

Cl2 circ.

Improvements

Safe and

Health Haven

Public Health

Risk

Management

Plan

Maintain

LoS


not necessary. Any issues will be

covered by the current operational

budget.


De

ma

nd

Ma

na

ge

me

nt

Pla

nn

ing

Pro

jec

ts

Universal

Metering

Positive

Leadership

Demand

Management

Plan, Water

Conservation,

Climate

Change

Policy

Growth,

Maintain

LoS

New assets will increase

expenditure due to increased

operational expenditure.

Combination of predominantly loan

funding and some development

contributions.

Williams dam

storage

increase

Positive

Leadership Demand

Management

Plan

Increase,

Maintain

LoS




budget.

Combination of predominantly loan

funding and some development

contributions.

Establish

Demand

Management

Plan

Positive

Leadership

Demand

Management

Plan, Water

Conservation

Growth,

Increase

LoS

After initial plan production, further

funding will only be needed for

reviews or updates. Will be loan funded.

Str

ate

gic

Asse

t

Ma

na

ge

me

nt

Pro

jec

ts

Clapcott Dam

supply main

replacement

Positive

Leadership

Public Health

Risk

Management

Plan

Maintain

LoS




budget.

Will be funded from depreciation

reserve.

Water Utility:

Asset

Componentry

Condition

Positive

Leadership

Increase

LoS


not necessary. Will be loan funded.


n-49637 Page 71

Project Community

Outcomes

Strategy and

policy

Levels of


Assessment &

Renewals

Program. 1

FTE for

24months

SN

Z P

AS

45

09

:20

08

Fir

e

Fig

hti

ng

Co

mp

lia

nc

e

Pro

jec

ts

Fire-fighting

upgrade (In

previous

LTCCP)

Positive

Leadership

Maintain

LoS





sufficient.

Combination of predominantly the

depreciation reserve and some

development contributions.

Western

industrial Ring

Main (In

previous

LTCCP)

Positive

Leadership

Public Health Maintain

LoS





sufficient.

Combination of predominantly the

depreciation reserve and some

development contributions.

Asse

t M

ain

ten

an

ce

Pro

jec

ts

Bulk

Distribution:

Te Arai Pipe

Bridge repairs

Safe and

Health Haven Public Health

Maintain

LoS

Upgrades will create greater

security in the operation of this



sufficient.


Distribution:

Hospital Hill

waveband

(Design &

Built, 5year

priority)

Safe and

Health Haven Public Health

Maintain

LoS

Upgrades will create greater

security in the operation of this



sufficient.



n-49637 Page 72

6.3 Preferred option

The following summarises the preferred option for the major Water supply projects scheduled in the next ten years. Table i: Proposed Water Supply Improvement Plan Programme for next 10yrs

Identifier Project Name Project Driver Description of preferred option LOS Year(s) Total

Budget

CX5 Te Karaka WS upgrades (subject to

CAP funding) Public Health (DWSNZ:2005)

Following a successful Capital Assistance Program (CAP)

application; design, build and improve on the water

supply system by studying the current situation then

initiation of the improvements to be made. These

improvements are yet to be fully determined.

Statutory

Compliance,

Maintain LoS

2010/11 $250,000

CX6 Whatatutu WS upgrades (subject to

CAP funding) Public Health (DWSNZ:2005)

Following a successful Capital Assistance Program (CAP)

application; design, build and improve on the water

supply system by studying the current situation then

initiation of the improvements to be made. These

improvements are yet to be fully determined.

Statutory

Compliance,

Maintain LoS

2010/11 $250,000

OPX 3

Te Karaka Water Supply

Improvements: Design and

Supervision (subject to CAP funding)

Public Health (DWSNZ:2005) If CAP application is successful, approve budget for the

Consultancy costs involved in the design and supervision

of the upgrading of Te Karaka Water Supply.

Maintain LoS 2011/12 $20,000

OPX 2

Whatatutu Water Supply

Improvements: Design and


Public Health (DWSNZ:2005) If CAP application is successful, approve budget for the

Consultancy costs involved in the design and supervision

of the upgrading of Whatatutu Water Supply.

Maintain LoS 2011/12 $20,000

CX4 Hospital Hill Cl2 circ. Improvements Public Health (DWSNZ:2005) Study, design and construct a process and/or device

that will efficiently mix the volume of water within each

Hospital Hill Cell.

Maintain LoS 2011/12-

2012/13 $115,000

CX8 Universal Metering Demand Management, Water

Conservation, Climate Change

Install meters on all domestic and commercial

connections on the Water Reticulation Network. It will

also involve replacement of older style Toby manifolds

that aren‟t compatible with the model of water meter

chosen for mass installation.

Growth,


2018/19 $4,000,000

CX9 Williams dam storage increase Demand Management

Design and build an extension on the 'Morning Glory'

overflow. Carry out project according to the

recommendations noted in the Mangapoike Dams Safety

Review Report by OPUS Consultants Ltd and any future

design specifications.

Increase,


2016/17 $1,026,198

OPX 16 Establish Demand Management Plan Demand Management, Water

Conservation

Develop and implement a Demand Management Plan for

the Water Supply System.

Growth,

Increase LoS 2009/10 $50,000


n-49637 Page 73

Identifier Project Name Project Driver Description of preferred option LOS Year(s) Total

Budget

CX10 Clapcott Dam supply main

replacement Public Health (DWSNZ:2005)

Install a 450mm pipeline from Clapcott Dam Intake

Tower to the junction with Williams Dam pipeline (approx

600m).


2015/16 $729,000

OPX 21

Water Utility: Asset Componentry

Condition Assessment & Renewals

Program. 1 FTE for 24months

AMP – Statutory Compliance (NZ IAS

16) Approve budget for the required work to take place Increase LoS 2010/11 $75,000

CX11 Fire-fighting upgrade (In previous

LTCCP)

Statutory Compliance (SNZ PAS

4509:2008)

After calibration of the Hydraulic Water Model, upgrade

water mains identified by the modelling process to meet

the Firefighting CoP:2008


2012/13 $481,280

CX12 Western industrial Ring Main (In

previous LTCCP)

Growth Model – Security of supply for

large industry

Design and construction of pipeline which creates a ring

main situation by joining the end of the racecourse water

main to the Aerodrome/Awapuni Rd water main


2009/10 $1,074,182

OPX 5 Bulk Distribution: Te Arai Pipe Bridge

repairs Public Health (DWSNZ:2005) Carry out recommendations made by OPUS in the

Structural Inspection Report of Feb 2006 Maintain LoS 2010/11 $73,500

OPX 6 Distribution: Hospital Hill waveband

(Design & Built, 5year priority) Public Health (DWSNZ:2005)

Design and build a Waveband that when an event for its

design use occurs (predominantly large earthquakes), it

will be subject to less damage and in large part, be

reusable. This subsequently reduces the

repair/replacement cost and contamination risk


2012/13 $100,000


n-49637 Page 74

7. Improvement Plan Council is committed to an ongoing improvement philosophy, and plans to progressively review and improve Councils asset management planning. The

improvement plan detailed in the Table below outlines the steps Council intends to take in order to improve various aspects of the Stormwater Activity as

they have been identified within this activity management planning document.

Project Issue Planned Improvement Target Date

M an

ag e m en t Pl

an s Demand Management

Plan

Currently no plan exists to reduce total water use,

promote water conservation to the consumer and

Establishment and implementation of a Demand

Management Plan. 2009/10

Imp

rove

me

nt

of

Info

rma

tio

n a

nd

/o

r S

yste

ms Sanitary Survey

Unknown land use and faecal and/or chemical

contamination risks within the Waipaoa River

catchment.

Consultants to conduct a Sanitary Survey of

farmland properties at 5 yearly intervals. Results will

help determine where any potential contamination

issues could eventuate from.

2013/14

Asset Componentry:

Overall Strategy

Treatment Plants and Pump Stations are recorded in the

asset management computer program as whole assets,

which do not give maintenance records, renewals,

lifecycle and depreciation costings for the components

within these areas of the water network. Understanding

of the asset is insufficient in this area.

Condition assessments and renewals program

developed for each component within the Treatment

Plants and Pump Stations. 1 FTE for 24 months

applied for funding also.

Initial funding applied

for 2009/10-2010/11

Telemetry Upgrade:

Gaddums Hill and Hauroa

Rd

Unknown status of Gaddums Hill and Hauroa Rd during

abnormal operation due to no remote access available.

CAPEX funding needed to complete telemetry

installation at these remote sites, which will allow a

greater monitoring and operation capability for the

Water Operations Staff.

2010/11

Condition Assessments:

Pipe Bridges

Insufficient data on the main trunk line pipe bridges

condition to successfully set up a renewal program.

Depreciated for replacement in 2025.

Conduct a condition assessments and produce a

renewals program to ascertain a timeline for

implementation in the 2014/15 AMP

2012/13 – Needs to

be completed before

the writing of the

2014/15 AMP.

Condition Assessments:

Pipe

Insufficient data on the reticulation condition to

successfully set up a renewal program and

determine/verify water model calibration figures.

Conduct a condition assessments and produce a

renewals program to ascertain a timeline for

implementation in the 2014/15 AMP

2009/10-2018/19


n-49637 Page 75

manage the network in a more efficient manner.

Drought Management Plan

Currently no contingency plan exists to reduce total

water use, promote water conservation to the consumer

and manage the network during a drought.

Establishment and implementation of a Drought

Management Plan when a drought is occurring. 2010/11

Algae Management Plan Currently no contingency plan exists for the occurrence

of an algal bloom.

Establishment and implementation of an Algae

Management Plan to reduce the risk of an algal

bloom or when it is occurring.

2010/11

Emergency Response Plan

Currently we are updating the contingency plan that

gives guidelines on what to do during an emergency

situation.

Establishment and implementation of an Emergency

Management Plan. 2011/12

Activity Management Plan Old, out of date information. Needs revision and

updating every three years.

Consistent updating of the background data for the

AMP‟s before the writing of the AMP‟s. These include

condition assessments, new project estimates and

old project revision, updates of the renewal program

and processing of any projects identified since the

production of the previous AMP.

Revisions in years

2011/12, 2014/15,

2017/18


n-49637 Page 76

8.0 AMP Review and Monitoring

To ensure this plan remains useful and relevant the following process of AM plan monitoring and

review will be undertaken:

Formal Adoption of the AMP by Council.

Revise AMPs annually to incorporate and document changes to work programmes and new

knowledge from a variety of sources including results of improvement programming.

The following table details the activity and timetable adopted to achieve these objectives.

Activity Action Target Date

AM Plan Review and

Development Adoption of AMP by Council

Annual Review of AMP context

o Check AMP content for

consistency with Council

programme and plans.

o Compliance with AM

improvement

programmes

o Effectiveness and

adequacy of AMP

processes systems and

data.

Full review of the AMP and

external peer review of technical

content.

External review of AMP

information by Audit NZ.

Jan/Feb 2009

XX each year

May to October (3

yearly)

November 08to

January 09 then

three yearly.

Condition Data Review Condition Assessment

information.

Levels of Service Review service performance measures

(including public consultation process)

and formally adopt levels of service

Measure actual level of service and

report in Annual Report

Annually with fuller

review 3 yearly.

Risk Register Annual Review of Risk Register Annually with fuller

review 3 yearly.

AMP Monitoring

The following indicators will be monitored to measure effectiveness of this AMP.

Indicator Measure Source of

Information

Compliance with legislative

requirements Unqualified Audit opinion

relating to AMP outputs

Audit NZ reports


n-49637 Page 77

Quality of services delivered Increasing, or 100%

compliance with LTCCP /

Annual Plan targets.

Quarterly Activity

Reports and Annual

report

Quality of risk management No event occurring outside

risk profile

Audit of risk register

Compliance with

documented quality

assurance processes for:

- project prioritization and

financial planning

- data management,

customer service

requests

- risk management

- contract management

and supervision

- improvement

programme

implementation

100% compliance with quality

processes

Quality audit results


n-49637 Page 78


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Appendices

Appendix A - Levels of Service

LTCCP (15) – WATER SUPPLY

RATIONALE: The water supply activity is to provide the community supplied with public water primarily that is clean and safe. Secondary objectives are that the water should always be

available, at a suitable pressure, free from odour and taste issues, and is produced in an environmentally friendly, sustainable and affordable manner.

WATER SUPPLY

Levels of Service Statement

Performance Measure

Current

Performance

Targets

Data Source

Driver

Customer Technical

Yr 1

2009-10

Yr 2

2010-11

Yr 3

2011-12

Yr 4-10

2012-18

To Achieve Changes to

Target (Strategies,

Compliance, Efficiencies,

A)pproach

LOS (1) - Core Value:

Health and Safety

Provide water that is clean and

safe to drink, bath and wash

Number of complaints per

annum regarding water quality 21

(2008) 21

Decreasing

Trend

Decreasing

Trend

Decreasing

Trend

Contact Centre Report

- Water Quality

Effective protozoa

treatment.

Compliance with NZ

Drinking Water Standards

Achieved

(2008) Achieved Achieved Achieved Achieved GDC samples and

protocols to comply

with:

NZDWS

Effective protozoa

treatment.

Number of public advisory

notices issued to boil water

Zero

(2008) Zero Zero Zero Zero MoH Compliance

NZDWS

Effective protozoa

treatment at water plants.

LOS (2) - Core Value:

Quality

Water is available at an

Number of Requests for

Service regarding water leaks;

and

101

(annual average

2005-2008)

100 100 100 100 - 80 Contact Centre Report

- Water

Effective and efficient

maintenance contract and

renewals programme.


n-49637 Page 80

WATER SUPPLY

Levels of Service Statement

Performance Measure

Current

Performance

Targets

Data Source

Driver

Customer Technical

Yr 1

2009-10

Yr 2

2010-11

Yr 3

2011-12

Yr 4-10

2012-18

To Achieve Changes to

Target (Strategies,

Compliance, Efficiencies,

A)pproach

appropriate pressue, free from

taste and odours and produced

in an environmentally,

sustainable and affordable

manner

The percentage of requests

resolved within target

timeframes.

80%

(2005-2008) 80% 82% 84% 86% - 90% Improving customer

satisfaction.

Number of events regarding no

water / or low pressure 50

(2008) 50

50

50

50 - 45

Contact Centre Report

- No Water

Effective and efficient


renewals programme.

Percentage of residents who

are very / fairly satisfied with

the water supply system

75%

(June 2008) 75%

N/M

82%

Year 4 - N/M

Year 5 - 10

86%

2 yearly Communitrak

Survey

Demand management

strategies. Better

customer focus through


operations within Utilities.

Water provided

continuously and without

restriction in compliance

with the maintenance

contract for up to a 50 year

drought in the Gisborne

region.

Achieved

(2008) Achieved

Achieved

Achieved

Achieved

Maintenance Contract

Reports

Demand management and

source water review and

strategy.


n-49637 Page 81


n-49637 Page 82

Appendix B – Asset information

Asset Info – Graphs Reticulation Material Type

0.00%

5.00%

10.00%

15.00%

20.00%

25.00%

30.00%

35.00%

40.00%

AC Cast

Iron

Epoxy

Lined

MDPE PVC ST-CI Other

Materials

% P

ipe L

en

gth

Material type of the reticulation system is largely dependant on installation date. Early pipes were

made of cast iron, in the 50‟s to 80‟s AC mainly used. Since the 1980‟s plastic have dominated

material types being installed.

Reticulation Age

0%

5%

10%

15%

20%

25%

30%

35%

0-5

6-2

5

26-4

5

46-6

5

66-8

5

86-1

05

106+

Remaining Life (Years)

% P

ipe L

en

gth

The pipe ages are reflective of the city development and expansion.

Reticulation Condition


n-49637 Page 83

0

10

20

30

40

50

60

70

80


Condition Grading

% P

ipe L

ength

Recent cast iron rehabilitation, lead pipe replacement programme and the relatively recent

installation dates means all assets are moderate or better.

Reticulation Performance

The good performance is a reflection on the condition and age of the reticulation. * Definition of Performance and Criticality Gradings:-

Grade Condition Performance Criticality

1 Very Good Always meets target service

standards.

No significant adverse short-term impact.

2 Good Almost always meets target service

standards.


disruption to service delivery.

3 Moderate Generally meets target service

standards.


disruption to service delivery, possible

health and safety effects and / or loss of

critical data.

4 Poor Does not generally meet target

service standards.

Failure will cause serious disruption to

service delivery over a substantial area,

possible health and public safety effects.

5 Very Poor Never meets target service

standards.

Widespread and serious disruption to

service delivery, possible health and public

safety effects.

0

10

20

30

40

50

60

70

80


% P

ipe L

ength


n-49637 Page 84

Asset Condition, Capacity/Criticality, Performance and Life

Gisborne City Water Supply (GCWS)

GCWS Collection/Source: Condition

Earthquake Damage

On December 20th 2007, the Gisborne region experienced an earthquake measuring 6.6 on the

Richter Scale. This caused the GDC Utilities department to carry out post event inspections as soon

as practicable. This inspection list included all structural water assets and initially found the all

Mangapoike Dams to be of relatively good condition.

Because these assets are high priority, Utilities then commissioned an inspection to be carried out

by OPUS Consultants. The scope of work included the following:

A visual inspection of Clapcott, Sang and HC Williams Dams covering all outside and inside

surfaces where accessible.

A full photographic record of items of interest.

Advise of any initiatives/recommendations to be implemented or earmarked for further

investigation.

Estimated cost of the work recommended.

After the Engineers inspection, his report included the following results:

Reservoir Type of Construction Condition

Clapcott Concrete arch Inconclusive due to vegetation overgrowth.

Sang Earth Generally in good condition.

HC Williams Earth Generally in good condition.

HC Williams Dam

The water quality within the dam is generally of high quality. Compressed air is used during summer

to prevent stratification. Testing of the different depths within the dam has indicated a large portion

of the water can be used on a continual basis. This has been concluded through the use of nutrient

testing, oxygen and temperature analysis. Further testing of the dams will continue to establish the

operating regime for taking of water to achieve a consistent and reliable water quality.

Due to risks associated with earth dams, a control monitoring programme to monitor both movement

and settlement of the dam exists. Monitoring to date has shown no issues.

A formal inspection programme has been developed and implemented. Regular mowing of the grass

embankment is undertaken.

The water source is generally considered secure although poaching and some illegal cannabis

growing does exist within its catchment and has the potential to compromise the water supply

although the risk is not considered high. Any further areas around the actual intake consist of

forestry plantings but do not discharge into this catchment. The catchment is part of the Hawkes Bay

Catchment which is located on the Wharerata Hills, the divide between Gisborne and Wairoa.

Council‟s consents for this dam lie with the Hawkes Bay Regional Council.

Clapcott Dam

The Clapcott Dam is a concrete arch dam and is showing signs of some deterioration; however it is

generally in good stable condition.


n-49637 Page 85

A seismic analysis of the structure has been undertaken by Works Consultancy and a life of

200years has been assigned to this structure. The dam receives compressed air from a compressor

pump to ensure that stratification of layers does not occur.

Annual monitoring of water leaks is taken on the dam face to monitor deterioration. To date leakage

is stable and monitoring will continue. Localised leakages will be plugged on an “as required basis”

as part of routine maintenance.

Sang Dam

The condition of the Sang Dam is good.


Te Arai Bush Catchment consists of 1,100 ha of land of huge intrinsic value as a gene pool for flora

and fauna. It remains the finest example of undisturbed dense native bush on East Coast soft hill

country. The area boasts diverse vegetation and soil character. It has a QEII designation on the land.

The catchment is inspected aerially on an annual basis for slips, vegetation die off or other factors

that could affect water quality.

The main operational issues regarding this area are the control of pests (possums, goats, pigs) and

to a lesser extent disease. Council as a result undertake regular sanitary surveys.

At the lower end of the catchment a concrete weir was constructed as an inlet for the capture of the

Te Arai River. The Bush Catchment provides 40% of the City‟s current water. Some maintenance

issues surround the effective operation of the screen washing system. A condition and operation

check will be carried out to determine if improvements need to be made. These have been identified

and inserted into the Gisborne City Water Supply Public Health Risk Management Plan (PHRMP).

For the purposes of water supply it provides a high quality source. While the water rises beyond a

turbidity level impractical to treat during heavy rain, it returns to a practical level far quicker than

surrounding catchments. For example, it is the norm rather than the exception to bring the river back

on line within 24 hours of heavy rain while the river downstream is still of an unacceptable quality -

due to tributaries past the bush line.

Waipaoa River

The Waipaoa River is the source water for the Waipaoa Augmentation Plant. The Waipaoa River has

the second highest sediment loading of any river in the world and hence the extraction intakes have

been placed below stream bed level, to allow some filtering before extraction. Entire catchment

control is difficult due to its extent however district land use plans do provide some regulation of use.

To improve knowledge of potential faecal and/or chemical contamination risks, a project has been

proposed to involve a Sanitary Survey of the Waipaoa River catchment. Further detail is included in

Section 7: Improvement Plan.

GCWS Collection/Source Pump Stations: Condition


As a consequence of its critical nature the previously existing DC motor has been replaced and

upgraded with an AC motor, in combination with the replacement of the variable speed controllers,

due to their unreliable nature. The refurbishment of the existing site is now complete and the high

level maintenance is undertaken on this site, by both mechanical and electrical means and it

remains in a fairly new condition. Site reliability of all equipment is high and reflects the level of

maintenance and inspections that occur.


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Maintenance checks are monthly, vibration analysis being undertaken on a six monthly basis, now

extended to yearly with the establishment of historic data and regular checking of all electrical items

on the site, with specific use of infrared protection equipment to identify hot spots within all

switchboards ensuring site condition is maintained to a high standard.


High level maintenance occurs at this critical site and therefore the mechanical and electrical

equipment is in excellent condition.

The overall condition of the site is excellent and being of a new construction, no perceived

maintenance problems exist. This site is deemed a critical component and therefore high level

maintenance and monitoring occurs.

Waipaoa Intake Pumps

The condition of these pumps is good and has had relatively small usage since installation. An active

monthly check and maintenance programme ensures reliable serviceability.

Emergency Bores

Condition of the bores is high with only one historic problem, being a leak in the existing wiring

causing a burn out of the electric motor. This occurred in Cameron No. 2 and required extraction,

refurbishment of the electric motor and replacement of the electrical cables.

Routine maintenance is undertaken on these bores on a monthly basis with a run up of

approximately one hour to ensure they reach operational temperatures and maintain that for a

defined period. Draw down tests have been performed with motors being run over a 24 hour period.

Council will continue to maintain these bores for emergency provisions.

GCWS Collection/Source: Performance

An extensive quality manual system has been developed to control and direct the operation and

hence the performance of these dams and water supplies. Details are in the “Headworks, Waingake

and Waipaoa Work Instructions Manual”.

Also, extraordinary events that could have a large effect on the performance of the Mangapoike

Dams are droughts and Algae issues. These have been identified as high enough in risk to propose

the establishment and implementation of a contingency and management plan. Further details into

these proposed projects are included in Section 7: Future Improvements.

HC Williams Dam

HC Williams Dam is the largest earth dam in the region and consists of a water intake for supply

purposes, an internal spill way (morning glory) which discharges excess water through the dam wall

to a controlled spill way below the earth dam. An emergency spill way is located to one side of the

earth dam should excess rain occur and the internal spill way cannot cope. The intake structure at

the dam works well although the condition is unknown.

Water is conveyed from the Williams Dam through a 450 mm diameter concrete lined steel pipe via

two Booster Pump Stations (Damline and Fairview Booster Pump Stations) and connects to a

common supply pipe with the Te Arai bush intake. It then gravitates to the Waingake Water

Treatment Plant some 8 km from the dam itself.

Algae have been suspected to have an effect on filter run length. A monitoring programme has been

established by NIWA to measure the algal levels in the dam which is part of the Algae Development

Plan identified in the Gisborne City Water Supply PHRMP (proposed new project for Results from

samples have been analysed but are yet to be interpreted. The operators are currently continuing the

sampling program to gain further data. The dams are on an active cycling programme in an effort to

ensure the water turns over adequately within the dam.


n-49637 Page 87

The introduction of trout to control algae has been investigated and in consultation with Fish and

Game NZ a viable consideration. The issues preventing this are; one there is no river entries into the

dam itself meaning no spawning ground for trout all stock will therefore need to be introduced, and

two Fish and Game are not in a position to supply trout unless the dam lakes were opened to the

public for recreational fishing which introduces access and potential contamination issues.

Lamination or stratification within the dam has been identified to occur. Compressed air is blown

into the dam through a perforated pipe to de-stratify the water body.

Clapcott Dam

Clapcott dam has a more significant algae population with water sourced from Clapcott showing the

shortest filter run than either Williams or the bush catchment. In early 2005 Clapcott was dosed with

Copper Sulphate to reduce the algal population. Algae has been monitored by NIWA since then and

the results reflect a low concentration on Algae due to insufficient nutrient level within the Williams

and Clapcott Dams. The Water team has been advised that this low nutrient level is also to low to

sustain an Algal Bloom.

Previous inspections by divers showed the intake valves were no longer functional and replacement

was required in order to restore serviceability. Full replacement of the valves, valve key stand-pipes

and all intake tower bolts and nuts eventuated and was completed in 2007/08. These upgrades

occurred because of re issuing Capital Works funding, originally allocated to the Waingake

Emergency Intake fund, to this project.

Performance is now restricted by the pipe outlet size from the Dam. The existing line is a 300mm

pipe that feeds into a 450mm pipe prior to the first Booster Pump Station. This creates a problem

that when the Clapcott Dam is solely used; the Booster Pump Station cannot operate at 100% as the

pump trips out on low suction pressure. In order for this to be rectified the 300mm line will need to

be upgraded. This has been noted in the Gisborne City Water Supply PHRMP.

Lamination or stratification within the dam has been identified to occur. Compressed air is blown

into the dam through a perforated pipe to de-stratify the water body.

Sang Dam

The Sang Dam is the emergency storage dam that feeds into Clapcott. This dam is the smallest and

shallowest and therefore most susceptible to major algal population explosions. Because Sang Dam

is drained into the Clapcott Dam for abstraction, the water quality effects on filter performance is

unknown. Sang dam was used as an experimental testing area for Copper Sulphating to ensure

copper and sulphate residuals were acceptable post dosing. These trials were successful and lead to

the Clapcott dosing.

This dam is cycled periodically via a siphon.


The main operational issues regarding this area are the control of pests (possums, goats, pigs) and

to a lesser extent, disease originating from these pests. Council as a result undertake regular

sanitary surveys.

At the lower end of the catchment a concrete weir was constructed as an inlet for the capture of the

Te Arai Stream. Maintenance requirements are low and generally problem free. The weir is flushed

from a 7,000 L chamber serviced from the dam‟s line that works on an automatic siphon system.

This chamber was installed at the time of the weir and its condition and effectiveness needs to be

confirmed.

A report has been completed by Opus Consultants to extract more water from this river. A pumped

take would be required to maximise the take which conflicts with pumped flows from the

Mangapoike Dams in summer. This option is not considered economically justified due to the

availability of the Waipaoa Augmentation Plant, but also, there is proposed legislation (National

Environmental Standard for the Measurement of Water Takes) requiring the water operations to

leave a minimum flow in the river which is currently not the case. Current resource consents allow


n-49637 Page 88

the full usage of the Te Arai Stream to be obtained. This proposed legislation could affect the

performance immensely due to reduced supply capacity.

Due to the RL‟s of the dams and the bush intake, a break pressure chamber is required to dissipate

the energy of the water coming from the dams. This chamber works well but is thought to introduce

air into the pipeline reducing its capacity. Several changes have recently been made to reduce the

introduced air problem and initial signs are good but the full effect will not be known until further

monitoring is completed.

There has also been discussion over some time about replacing this chamber with a micro-power

generation scheme. A project report on this option has been produced by Works Consultancy which

in 2007/08 was reviewed by an independent engineer. After reviewing the original report he

concluded that, while the project costs and benefits are now substantially different, the project

warrants serious consideration. For the year 2008/09, GDC will carry out a feasibility study

concerning this option and the findings of the study will determine if this will be cancelled or

pursued.

Waipaoa River

Water quality of the Waipaoa River is poor. Heavy sediment loads mean that this water source is

difficult to treat however the Waipaoa Augmentation Plant has been specifically design to

accommodate this.

The regional arm of council has established a minimum river flow of 600 l/s at the Matawhero

Bridge and 1.3m³ per sec at the Kanakanaia Bridge at which restrictions may be applied. These

flows have never been reached and restrictions never applied. It is thought that when the river is in

low flow condition, water drains from the surrounding aquifers supplement the normal water flows.

GCWS Collection/Source Pump Stations: Performance

Energy Audit Report

In early 2007, via Economic Development: GDC, Utilities commissioned Power Solutions Ltd to

conduct an Energy Audit on the Water Supply System which included the Collection/Source Pump

Stations. The scope of work included the following:

Investigate efficiencies that can be gained within the main city water supply system and

prepare a report.


investigation.

Estimated cost of the work recommended and estimated savings expected.

Recommendations for implementation from this report (Gisborne District Council – Water Supply

System Energy Audit – Oct 2007) are included in the Improvement Plan.


The gravitational flows from the three Mangapoike Dams is limited to a maximum of 500 m³/hr, any

flows above this requires additional booster pumping and the main pump station that achieves this

is the Damline Booster Pump Station. Damline Booster Pump Station runs full-time through summer

and approximately a third of the time during winter.

Due to its key role in providing summer flows, a second stand-by pump exists on this site with pump

duties being rotated. The site is telemetry monitored to identify faults and has the provision for a

stand-by generator to be connected to it in an emergency situation. The power supply in this area is

of poor quality and interruptions to supply can be expected.


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Two pumps exist on site, one as duty pump, the other as stand-by in recognition of the criticality of

this site. Maximum flow from the pump station can vary dependent on the dam levels. Gravity flow

can be achieved from this site with no pumping at 500 m³/hr. The existing combined maximum flow

of DLB and Fairview Booster Pump Station (FVB) are 1,200 m³/hr, a potential maximum flow of

1,530 m³/hr is possible with an upgrade of the Fairview booster pump which will be discussed with

Fairview Booster Pump Station. Due to treatment plant constraints with dealing with this quantity of

water, it is envisaged that this option would not be pursued to achieve its maximum output given

also that the Waipaoa Augmentation Plant is available, and the cost benefit would not be achieved

with a capital upgrade of Fairview Booster Pump Station, until such time as population demand

would dictate which is not perceived in the next 20 years.

Its remote nature both from Gisborne and the Waingake Water Treatment Plant has some

operational constraints which have generally been overcome by the use of telemetry system and

remote control. We see this as an integral part of its operation, but can be run on-site without the

use of system controls.

Fire issues we believe is the highest risk for this site, and accordingly a risk assessment of the

options for mitigation have been undertaken. The methods of extinguishing fire would render the

electrical equipment inoperative and would in effect cause an equal amount of damage, therefore

additional site security and maintenance activities are undertaken to minimise the risk of fire on this

site. The risks of its non-operation have been minimised due to the availability now of the Waipaoa

Augmentation Plant and that a combination of gravity feed Te Arai Bush Catchment and the Waipaoa

Augmentation Plant, supply can be maintained, but depending on the time some levels of service

may be compromised until remediation work occurs on any damage.


Fairview Booster Pump Station is an auxiliary pump station containing one pump and requires

Damline Booster Pump Station to be running at 80% revs or more, to prevent it tripping out on low

suction pressure. Fairview Booster Pump Station provides an additional 200 m³/hr flow to Damline

at full flow. Fairview Booster Pump Station runs for approximately two months of the year, during the

peak of summer.

To increase the overall supply, it is possible with changing of the existing pump system to achieve

1,530 m³/hr by increasing the pump size to a 500 kW. As previously mentioned, with the

requirement to upgrade the treatment plant to cope with the additional increase coupled with the

existence of the Waipaoa Augmentation Plant, there is no plan to implement this strategy.

Provision has been made on the FVB site for an additional pump and is conceivable could operate in

tandem with the existing one.


These pumps perform in order to supply the design flow rates between 180 to 790 m³/hr (50-

220l/sec). They are operated by automatic or manual control and are adjusted to work in series or

parallel in order to supply volumes required.

The pump station is constrained by the extraction rate from the web screens in the Waipaoa River

and regular maintained maintenance must occur to ensure full functionality. However, during periods

of high demand access to the screens is not possible and contingency reviews have meant that an

emergency intake has been constructed. Additional intake provides additional security and will have

the added benefit of a lower amount of sediment being pumped into the settling ponds.

Emergency Bores

During Cyclone Bola three emergency bores were constructed, Hansen Road, Cameron Road No. 1,

Cameron Road No. 2. These bores are run up monthly to ensure the performance of these assets is

up to a suitable standard. The Cameron Rd No. 1 bore is currently leased to Riversun Nursery who

utilise water for grape rootstock watering. Their bore pump is currently installed with the agreement

that they may have only 24 hours notice to remove it should Council require it.


n-49637 Page 90

The discharge from the Cameron Road Bore No.2 is pumped monthly, discharge occurs to the

Taraheru River. Hansen Road Bore is also pumped to ground monthly.

Recharge on these bores is unknown as they have never been operated for an extended period of

time. Modelling at resource consent stage suggests there is sufficient volume for Council to meet

emergency needs it may have to utilise the bores for. Pump tests indicate the consented volumes

and rates of the takes are sustainable. Water quality is poor with a high iron content causing

significant quality issues.

Emergency Bores Cameron Road No. 1 Cameron Road No. 2 Hansen Road

Water Quality

Manganese g/m³ 0.107-0.170 0.107-0.170 0.198-0.240

pH 7.14-7.45 7.14-7.45 7.17-7.49

Hardness (Total) g/m³ 360-430 360-430 410-460

Ammonia g/m³ 4.7-6.2 4.7-6.2 5.3-7.0

Total Iron g/m³ 2.3-3.4 2.3-3.4 1.5-1.9

GCWS Collection/Source: Capacity and Criticality

HC Williams Dam

HC Williams Dam was constructed in 1974 and has a total capacity of 2,291,864 m³, a useable

capacity of 1,833,491 m³ and is at elevation of 473.5 m above sea level. Maximum depth of the

dam is 14.25m.

It is supplied by a catchment of 254.9 ha which is uninhabited and consists of secondary regrowth

generally being Manuka.

Should additional capacity be required at the HC Williams Dam the dam structure has been designed

to accommodate this. The existing governing factor is the „Morning Glory‟ a concrete overflow

structure which limits the height of the water in the dam. This is not seen as a required option to

meet future demands but may be considered under the scope of demand management. In March

2008, Opus Consultants produced a report of the Mangapoike Dams which included

recommendations of raising the „Morning Glory‟ height. The optimum workable recommendation is

raising the height 300mm. If this were extended then additional capacity could be created. Further

details on this project are in Section 6: Options and choices.

This asset is highly critical as it provides essential summer storage and a reliable water supply when

the bush catchment is too turbid to provide water to the treatment facility.

Clapcott Dam

Clapcott Dam was constructed in 1948 and has a total capacity of 1,121,365 m³, a useable capacity

of 896,500 m³ and is at elevation of 472.9 m above sea level. It is supplied by a catchment of 148.9

ha which has similar characteristics to the HC Williams Dam. Maximum depth of the dam is 11.6m.

Should additional capacity be required at the Clapcott Dam the dam structure has been designed to

accommodate this. The existing governing factor is the spillway crest, an overflow structure within

the main dam wall which limits the height of the water in the dam. This is not seen as a required

option to meet future demands but may be considered should the situation arise. In March 2008,

Opus Consultants produced a report of the Mangapoike Dams which included recommendations of

raising the spillway crest height. The optimum workable recommendation is raising the height

150mm. If this were extended then additional capacity could be created.


n-49637 Page 91

Clapcott Dam is a storage dam to provide water through summer demand when the Te Arai River is

flowing at its lowest. It also acts as a buffer for winter flows when the Te Arai River is running turbid.

Sang Dam

The smallest of the three dams, Sang Dam is a 1972 earth dam that holds a total and useable

capacity of 347,568 m³. Elevation of sang is 514.7m and has a maximum depth of 8.6m. The

catchment area for Sang is 41.1 Ha.

0

500

1000

1500

2000

2500

Sang Clapcott HC Williams

Reservoirs

000's

m3 Capacity

Useable Capacity

Catchment Area (ha)


The Bush Catchment provides 40% of the City‟s current water. Winter take averages 500-600 m³/hr

while summer take averages 100-200 m³/hr. During periods in winter following heavy rainfall events

entrained sediment negatively affects water quality to a point where it becomes untreatable using

the direct filtration configuration of Waingake. During these periods the bush take is isolated and

dam water only is utilised.

Waipaoa River

The Waipaoa river supply is highly critical. Gisborne has been fortunate that the last significant

natural disaster to directly affect the urban area was Cyclone Bola in 1988. The criticality of the

Waipaoa WTP and the Waipaoa River for water supply is often over looked there.

0

500

1000

1500

2000

2500

Waipaoa Te Arai

Source: Waipaoa Area (km2), Te Arai Area (ha)

Average Flow (Daily)

Catchment Area


n-49637 Page 92

CGCWS Collection/Source Pump Stations: Capacity and Criticality


The maximum delivery with this pump station operating is approximately 1000m³/hr. The actual

volume is controlled by a variable speed drive. Without this pump station operating volumes limited

to 500 m³/hr³ are conveyed to the treatment plant. During winter this is probably acceptable in most

conditions, except when heavy rainfall means no river water can be taken. During peak summer

demand conditions this would surely mean the city would run out of water and thus has a high

criticality.

One issue for Damline is that the outlet from the Clapcott Dam is only 300mm. When Damline

operates at 100% the 300mm line is of insufficient capacity to deliver the water fast enough and the

pump station trips out with low suction pressure. This problem is not experienced from Williams Dam

as the outlet pipe is larger being 450mm. Of the proposed major Water Supply projects for the next

10 years, the replacement of the 300mm outlet main with a 450mm is included in this. Further

detail is in Section 6: Options and Choices.


Fairview increases flow to the Waingake water treatment plant by an additional 200m³/hr. As a

contingency the implementation of a variable speed drive will allow Fairview to run independently

and would provide some level of redundancy from any failure of the Damline booster.

Fairview becomes a critical site for approximately six weeks a year at the very peak of the summer

demand. This is somewhat mitigated if the timing of running up Waipaoa Augmentation Plant

coincides with those peaks.


These pumps deliver the volume for the Waipaoa facility and can deliver up to 720m³/h. Without

these pumps the Waipaoa facility will not be able to function. They therefore have a very high

criticality.

Bores

Pump stations exist at the 2 emergency bore sites. Cameron Road site has two bores and Hansen

one. All bore have separate pumping structures and would be utilised only in extreme emergencies

(i.e. Civil Defence scenarios) when surface water supplies become contaminated or unusable. The

last time these were operated for water supply was March 1988 when cyclone Bola destroyed the

main supply line. Since then the Waipaoa Augmentation Plant has been constructed to further

reduce the likelihood of abstraction for drinking water from these bores.

The capacities of the pumps are such that it would not meet the required demand of the City and

major water restrictions would be necessary. This is an excepted position given the likely

circumstances which they would be used.

GCWS Collection/Source: Life

Future life of the storage facilities varies. These are all being depreciated. As these stations near

replacement they will be condition assessed and replaced from the depreciation reserve as required.

The next condition assessments due are the Trunk Main Pipe Bridges which have a depreciated

remaining life of 16 years. This has been recognized since the 2004 Activity Management Plan and

further details on this project are in Section 7: Improvement Plan.

Install Date Structure Age Base

Life

Remaining

Life Comments


n-49637 Page 93

1/01/1962 Power Transmission 46.5 44 -2.7 Currently being programmed.

In progress.

1/01/1991 Cathodic Protection 17.5 17 -1.0 Relates to 'Cathodic

Protection Additional'

30/06/2006 Cathodic Protection Additional 2.0 17 15.0 Should be completed around

November 08

1/01/1962 Pipe Bridges 46.5 63 16.0

1/01/1962 Self-supporting Pipe Bridges 46.5 63 16.0

30/06/2008 New Inlet Valves Clapcott Dam 0.0 50 50.0

1/01/1948 No1 Dam - Clapcott 60.5 200 139.5

1/01/1972 No 1A Dam - Sang 36.5 400 363.5

1/01/1974 No 2 Dam - HC Williams 34.5 400 365.5

GCWS Treatment: Condition

Waingake & Waipaoa Treatment Plants

All equipment, mechanical and structural components for the treatment plants are in excellent

condition and reflect the recent construction dates of these sites.

Any foreseeable future capital expenditure will be due to an increase in standards rather than

condition or performance related issues. Recent maintenance of the components at Waingake has

ensured that most of the equipment is in good condition and is unlikely to need replacement in the

next 5 years. Electrical and mechanical components may need replacement before the asset is

renewed, where this occurs this will be done within the existing operational budgets and not

capitalised as the replacement is maintaining service potential not increasing the asset life or

upgrading performance. Structural renewals will be completed as part of the renewal programme.

GCWS Treatment: Performance

The performance of the treatment facilities is excellent. In stating this there is a recognition that the

plants are in a continual improvement status with fine-tuning occurring, as we understand the assets

to a more detailed level. The most likely future addition that can be projected at this point would be

the possible future use of ultra-violet light (UV) to remove and provide higher level of security for both

cryptosporidium and giardia removal, than that provided within the current system at both Waingake

Treatment and Waipaoa Augmentation Plants.

GCWS Treatment: Capacity & Criticality


n-49637 Page 94

The capacity of the Waingake Treatment and Waipaoa Augmentation Plants are adequate to meet all

current demands and predicted future demands.

The additional demand from the proposed extensions of the water supply reticulation into the

Western Industrial Area, the Taraheru Residential Area and potentially Makaraka can all be catered

for through the use of existing assets and the currently identified CAPEX work. Meeting the current

demand may involve running the Waipaoa Augmentation Plant for up to three months in summer to

supplement the supply. Demand Management Strategies will however be put in place and will have

an effect on this. This is further detailed in Section 5.2: Trends and Section 6: Options and Choices

(Universal Metering and Williams Dam Storage Increase).

The capacity of Waipaoa is adequate as this is usually only run during peak demands, maintenance

on the Waingake Water Treatment Plant and in emergency situations.

Supply of water for irrigation from the water supply reticulation can cause very high and in some

cases unsustainable demand during summer. As this is not the targeted use of the water supply this

is not considered essential demand and hence not be included in the planning window.

Waingake Water Treatment Facility

The treatment plant can currently process a winter maximum of 1450 m³/hr, in reality the summer

peak throughput is more like 1300 m³/hr. This lower volume is a resultant of the restricted

availability of water coming onto the plant. A maximum of 1200 m³/hr is available from the dam

supplies with all pump stations running and the remainder from the Te Arai River source. The

maximum daily throughput is accepted as being around 31,000m³ the volume to town is less

(28,000m³) due to water being required for backwashing of the filters where up to 3000 m³/day can

be required.

A future capacity review of the Waingake Water Treatment Plant has been undertaken. The original

long-term objective was to increase the outflow of treated water from the plant to 35,000 m³ per

day, which meant that approximately 38,000 m³ (inflow) would need to be treated to account for

system losses from backwashing of the filters. The review clearly identified the inadequacy of the

existing clarifier and the need for additional filters to achieve the required outflow. Additional

pumping on the supply mains would be required to deliver the additional quantities to the treatment

plant as well. Given that Gisborne District Council has an additional water treatment plant with the

Waipaoa Augmentation Plant, it was not recommended to pursue any future upgrading of the

Waingake Water Treatment Plant in the foreseeable future, until such time as demand or the

necessity to process high turbidity water and meet a high consistent outflow from the plant is

required. This should somewhat be alleviated with the development of a Demand Management Plan

as noted in the Section 6: Options and Choices & 7: Improvement Plan.

Waipaoa Augmentation Plant

The Waipaoa Augmentation Plant was constructed from the recovery process during Cyclone Bola in

March 1988. During this event the Gisborne City became quickly aware of its isolation and

dependency on the Waingake facility. As part of the rebuilding process it was identified that an

alternative water source and treatment facility was required and the Waipaoa Augmentation Plant

was constructed and commissioned by 1991 to augment the existing Waingake supply.

Waipaoa Augmentation Plant has the ability to produce water volumes up to 720m³/hr or 17000m³

per day although it is possible to deliver up to 880m³/hr or 21,000 m³ per day onto the plant.

Typically these volumes would only be required during emergency conditions and during routine

operations 8640m³ per day would be expected.

Waipaoa, while it has not been fully utilised, has shown on a number of occasions the critical role it

plays in the overall provision of water services. During drought events in 1998 and the low dam

period of 2004/05, Waipaoa was able to augment supply ensuring residential and commercial

customers noticed no reduction to their level of service. Should Gisborne continue to develop

industrially, Waipaoa also is a critical supply link for water.


n-49637 Page 95

GCWS Treatment: Life

The treatment facilities are comparably new with reference to many other facilities nationwide. Life

expectancy of these two assets is the same, at 44 years. These assets are being depreciated

annually and when they have reached their economic life will be replaced using this financial

reserve.

GCWS Distribution: Condition


A weekly inspection of the reservoirs is undertaken by water treatment staff. This inspection is to

ensure site integrity and to monitor chlorine residuals within the stored water. Following is an

overview of those items with identified condition issues, good condition can be assumed if not

identified otherwise.

Earthquake Damage

On December 20th 2007, the Gisborne region experienced an earthquake measuring 6.8 on the

Richter Scale. This caused the GDC Utilities department to carry out post event inspections as soon

as practicable. This inspection list included all structural water assets and initially found the all

reservoirs within the city to be of relatively good condition. The exception to this was Hospital Hill

Reservoir which obtained extensive damage to the waveband and crack damage to the pillars

supporting the roof.

Utilities then commissioned an inspection to be carried out by Concrete Tank Consultants. The scope

of work included the following:

A visual inspection of Knob, Hospital Hill and Taumata Reservoirs covering all outside and

inside surfaces.

A full photographic record of items of interest.

Preparation of report with recommendations of scope for further investigation.

Estimated cost of the work recommended.

A prioritisation of the work required in the form of a 10 year maintenance programme.

After the inspection, the report included the following results:

Reservoir Type of Construction Condition

Knob Hill

Post-tensioned cast in situ concrete walls with

reinforced concrete dome roof and reinforced

concrete floor.

Good subject to minor repair work. Roof in good

condition and walls in remarkably good condition for

its age.

Hospital

Hill

Cast in situ floor, walls and roof. Roof supported

independently by columns.

Good apart from cracking of columns and damage

to waveband.

Taumata

Reinforced concrete walls set in the ground.

Reinforced concrete floor and a corrugated steel

roof.

Remarkably good condition considering age. Known

to be subject to vermin and similar ingress.

Recommendations for implementation from this report (Gisborne District Council – Visual Inspection

of Three Reservoirs – April 2008) are included in Section 6: Options and Choices.


Due to the recent earthquake, the reservoir condition is currently being addressed. This reservoir has

been condition assessed and from the results of a report from Concrete Tank Consultants, an

improvement plan has been established. As far as sedimentation goes, there is a minimal residue

because of the recent cleaning and super-chlorination by Fulton Hogan contractors. Further planned

inspections will be undertaken to monitor any further deterioration. At this stage this monitoring will

be met within the maintenance budget.


n-49637 Page 96

Knob Hill Reservoir

The rate of sedimentation within the reservoir is considered minimal and the historic five yearly

cleaning has been extended to seven years. This was last completed in 2007/08 in conjunction with

the condition assessment by Concrete Tank Consultants. Following the remaining cast-iron

rehabilitation work, we believe that this is likely to go out to approximately 10 years. Replacement of

joint sealant will be periodically undertaken following routine inspections and performed as part of

normal maintenance. A report was undertaken on the seismic reliability of the reservoir and also a

risk assessment of a future building site was undertaken. The recommendation is no additional

reservoirs should be placed beside the existing one, but all other factors of performance are

adequate for the existing reservoir.

Taumata Reservoir

Taumata Reservoir is the oldest of the reservoirs but overall structure is in sound condition. The roof

was replaced three years ago due to wind damage so is in excellent condition. The reservoir is

inspected when empty for sealing issues. These inspections highlighted poor sealing that has since

been repaired. The pipe line that feeds the Taumata Reservoir is both an in and out line and this

pipe line was upgraded five years ago as part of a risk assessment of the reservoir structures. No

major capital expenditure is budgeted for this reservoir in this asset management plan, and all

needs will be meet from the yearly operational budget.

High Level Storage

The Gaddum‟s Hill tanks have been subjected to some land instability since installation. Monitoring

is occurring on the amount of movement that is occurring. The tanks positions have not moved in the

past three years and monitoring will continue at this site.

Hauroa Road tanks may also be subject to stress and the inlet line has been noted to have a stress

kink in it. Monitoring is occurring on this site and to date no immediate action is required.

GCWS Distribution: Condition Pump Stations

Waipaoa City Pumps

The condition of these pumps is good and has had relatively small usage since installation. An active

monthly check and maintenance programme ensures reliable serviceability.


The motors are DC motors and were over-hauled in 1996. High maintenance occurs on this site as

part of on-going efficiencies, operational changes and minor upgrades have taken place to improve

the efficiencies, an example being the use of split seals replacing the requirement for historic

packing to prevent leakage from the bearings of the pumps. This has successfully prevented leakage

of water from the pump bearings and reduced the friction and hence reduced the power

requirements.

The pump station building is of A frame construction and is of excellent condition. The roof and

internals have recently been repainted and no immediate maintenance is envisaged. Internally the

21 inch City main is above ground for pumping purposes and is in good condition within the pump

station. Cathodic Protection does exist for the City pipeline, but due to electrical interference with the

control and electrical appliances it is a requirement to electrically separate the Cathodic Protection

from the internal electrical components on the site. This is not an issue as no corrosion is expected

for pipe work above ground.


This pump station is relatively new and its condition reflects that. The above ground cabinet and

control gear is housed in a sturdy cover. The pumping equipment is below ground and is housed in a


n-49637 Page 97

concrete well chamber. The condition of the pumps is good. An active monthly check and

maintenance programme ensures reliable service.


The condition of this pump is good considering the age of the motor but it has had initial problems

pertaining to the setup of this system. After monitoring and making improvements to counter issues,

it now shouldn‟t need any improvements that are known at this time. An active monthly check and

maintenance programme now ensures reliable serviceability.

Gisborne High Level Pump Stations

The condition of the high level pump stations is good. Active weekly monitoring and inspection

programmes identify issues as they arise. Routine maintenance occurs proactively as part of the

reticulation maintenance contract.

GCWS Distribution: Performance


The two cells are 300 mm different in height, with the roof being supported by internal beams to

provide a gap between both the roof and the reservoir walls, to allow water to be dissipated over the

sides during a major earthquake event where wave action within the reservoir will occur.

Lamination is known to occur in the reservoir. It is unclear if this is temperature stratification or due

to water flow path. This is largely managed by operational methodology but it does require additional

investigation and action as per the Gisborne Water Supply PHRMP. Further details are included in

Section 6: Options and choices as one of the major water supply projects proposed for the next 10

years.

Knob Hill Reservoir

Knob Hill performs well and meets the operational requirements for current normal demand, but

there are some issues when the City is in peak demand. This has been identified by the use of the

Gisborne Water Model. Access to this site has been a health and safety issue with the track being

4wd only.

Taumata Reservoir

Historically this reservoir has operated during periods of high pressure when gravity can push the

required water to its elevation. Being the highest of all reservoirs, an operational change to system

pressures has meant that filling under normal operating situations cannot be achieved. To ensure

that future over-pressurisation of the reticulation does not occur, it is proposed to use one of the

existing emergency pumps which Council owns for the extraction of water in emergency from the

Waipaoa River will by the issue of this report have been constructed to pump water up to the

Taumata Reservoir. Information from this upgrade will be included into the asset management plan

as an improvement upgrade.

High Level Storage

The existing tanks all have an external water level indicator. The water level in the tanks is controlled

by a bermad altitude valve.

Locations that have specific items are;

Einstein Street has poor access and operationally has difficultly turning water over. This site

will be reviewed as part of the fire fighting upgrades programmed.

Hauroa road lower tanks have little or no turn over except when water is demanded for fire

fighting.

Hauroa road upper tanks

Mercury switches at Pah hill and Hauroa road need to be upgraded to allow better control

of volumes stored.


n-49637 Page 98

Gaddums Hill tanks have subsided and require tank levelling.

Access lids on all high level storage reservoirs have been identified as a potential source for

contaminant entry. Modifications to these entry hatches were carried out but after an extended

period since installation, this design will need further investigation.

Installation of equipment at some of the High Level Pump Stations has been identified in the

Gisborne Water Supply PHRMP. This is to reduce the risk of having an inadequate water supply to

the households feeding off the High Level Storage Tanks. Further detail is included in Section 7:

Improvement Plan.

GCWS Distribution: Performance Pump Stations

Energy Audit Report

In early 2007, via Economic Development: GDC, Utilities commissioned Power Solutions Ltd to

conduct an Energy Audit on the Water Supply System. The scope of work included the following:

Investigate efficiencies that can be gained within the main city water supply system and

prepare a report.


investigation.

Estimated cost of the work recommended and estimated savings expected.

Waipaoa City Pumps

The performance of these pumps is good and has had relatively small usage since installation. An

active monthly check and maintenance programme ensures reliable serviceability.


During gravity flows the water still flows through the pump station as flow is controlled by a Bermad

control valve during gravity conditions. This valve is by-passed when the pumps are running. With the

pumps operating at full capacity it is possible to create negative pressure on the suctions side of the

pump and hence is carefully monitored and operated within defined parameters. The minimum

suction pressure between 10pm and 6 am is 100kPa, during 6am to 10pm the minimum is

increased to 200kPa as demand dictates. The actual volume that this delivers is variable depending

on pipeline water demand prior to the pump station. Operation of the Makaraka Booster is controlled

by the work instructions developed as part of the quality system of this site.

Three pumps exist on-site with two running in tandem at any one time, the other operating as a

standby pump with all pumps being rotated to achieve equivalent usage. Control of the pumps are

provided by the use of Alan Bradley SLC500 PLC‟s, with monitoring being provided by Abbey

Telemetry System. The site can be run manually.

The site has stand-by power for monitoring only, and if a power cut occurs, so will the pumping

capability of this site, but the power system is capable of having a generator connected. This was

last successfully utilised during the Y2K changeover and required an electrician for several hours.

The on site stand-by power that is provided allows the control of the gravity valve and also continues

to provide telemetry information of the site status.


Ormond Road is run to provide additional volume over to Knob Hill reservoir. The performance of the

Ormond Road Pump Station is very good. Operation of the Ormond Road Booster is controlled by the

work instructions developed as part of the quality system of this site.


The performance of this pump is good considering the age of the motor but it has had initial

problems pertaining to the setup of this system. After monitoring and making improvements to


n-49637 Page 99

counter predominantly high temperatures and cooling issues, it now shouldn‟t need any

improvements at this time. An active monthly check and maintenance programme now ensures

reliable serviceability.


The performance of these pump stations is generally good. Some issues arise in summer demands

where it is possible for these pumps to loose prime and require resetting. These issues are relatively

small and easily overcome.

Hauroa Road doesn‟t operate on a daily operational basis to service consumers as the mains

pressure fills this high level storage. It is required however when fire hydrants are being utilised as

the pressure from main supply is insufficient.

GCWS Distribution: Capacity & Criticality


Council has three main reservoirs, Taumata, Knob Hill and Hospital Hill which provides approximately

one and a half days storage in summer and five days storage in winter. There are also a number of

small storage reservoirs within the system in order to meet demand in geographically high areas of

the city.


The Hospital Hill Reservoir is the newest, has the greatest storage capacity and is a critical asset to

the overall performance of the reticulation system. The reservoir is divided into two cells,

independently valved and operated with one pipe feeding water in and out of the two cells. Level

control is with altitude valves requiring small hydraulic pumps to ensure adequate closure. Council

has made provision for an additional storage cell to be constructed on this site, but it is not

envisaged that this will occur within the planning horizon of this Activity Management Plan.

Knob Hill Reservoir

The Knob Hill Reservoir is a circular tank constructed of pre-cast, pre-stressed concrete and

operates with an internal float with water being delivered to and from the reservoir through one pipe.

This site is telemetered for water levels.

Taumata Reservoir

Built in 1933 Taumata is the oldest and highest reservoir in the reticulation system. It performs

adequately for the emergency purpose it serves and is regularly tested. Water is checked weekly and

turned over monthly to maintain quality.

Description Taumata Reservoir Knob Hill Reservoir Hospital Hill Reservoir

Volume m³ 3,846 8,805.6 38,517

Construction Date 1933 1961 1992

Shape Rectangular

(2 cells) Circular

Rectangular

(2 cells)

Dimensions (h x w x b) or (h x r) 4.88 x 17.68 x 26.29 7.366 x 19.507 4.5 x 69.2 x 69.2

Top Water Level 76.36 GPD 1926 67.83 GPD 1926 North 65.07 GPD 1926

South 65.65 GPD 1926

Bottom Water Level Telemetry 71.98 GPD 1926 60.46 GPD 1926 North 60.87 GPD 1926

South 61.45 GPD 1926

Level Control Manual Altitude Valve Ball Valve

Legal Description Lot 1 DP 3245 Pts Kaiti 327 x 335 c Lot 20 DP 9198

High Level Storage


n-49637 Page 100

Hauroa Road High Level Storage

Hauroa Road tanks service the houses in Hauroa Road. It is a dual system, with water feeding two

upper level tanks and two lower tanks which provide additional capacity utilised for fire fighting

requirements. Booster pumping is required for fire fighting purposes. Generally the upper tank

provides all necessary water. The lower booster pump is operated on a monthly basis as part of the

normal maintenance checks and is required to run for approximately one hour. This system is seen

as a critical component to the operation of reticulation and meets Council‟s legal obligations for fire

fighting purposes and ensures levels of service are maintained.

Gaddums Hill High Level Storage Tanks

Gaddums Hill has two upper tanks and operates on identical basis to the Hauroa Road system, in

this instance the pump is required to pump water to the upper tanks with the two lower tanks

stationed beside the pump station to act as storage for fire fighting purposes and are filled under

gravity.

Pah Hill High Level Storage Tanks

The Pah Hill tanks are stationed above the highest house at the top end of Wallis Road and consist

of six interlinked domestic house tanks, with water being pumped to them from a pump station

located beside the Knob Hill reservoir. This system is considered in excellent condition.

Hill Road High Level Storage Tanks

The Hill Road high level storage services the area of Hill Road, Hillary Heights and the top end of

Russell Street. Just above the intersection of Hill Road and Ballance Street a booster pump resides

to pump water to the four upper storage tanks, and is targeted to operate during off-peak power

consumption times which have a lower rate incurred.

Einstein Street Upper Level Tanks

This tank is a 25 m³ plastic tank. Water is fed to the tank by gravity, generally at night when system

pressures are high and back feeds water into the upper Einstein Street area during high peak

periods. Generally the combination of reticulation pressure and tank pressure provides adequate

levels of service. Regular inspections are undertaken on a weekly basis.

Description Hauroa Rd Hill Rd Einstein

St Gaddums Hill Pah Hill

Volume m³ 90.8 90.8 22.7 90.8 136.2

Construction

Date 1990 1994 2007 1991 1969

Shape Circular Circular Circular Circular Circular

Dimensions (h x

w x b) or (h x d)

2 upper, 2 lower

2.74 x 3.43

4 tanks

2.74 x 3.43

1 tank

2.7 x 3.48

2 upper, 2 lower

2.74 x 3.43

6 tanks

2.74 x 3.43

Top Water Level

(DOSLI)

Upper 66.1 m

Lower 43.4 m

56.4

approx 97.12

Bottom Water

Level Telemetry

53.9

approx 94.47

Level Control Altitude/Press Altitude/Press Altitude

Valve Altitude/Press Altitude/Press

Legal Description

Pump Station:

Road reserve

adjacent to Lot 3

DP471

Road reserve

adjacent to Lot 18 DP

4833

Road reserve

adjacent to Lot 3 DP

8662

Pts Kaiti 327 &

335C

Tanks: Lot 1 DP 8474 Pt Lot 38

DP 484

Adjacent to Lot 4 DP

1221 Lot 1 DP 5299

Taumata Reservoir


n-49637 Page 101

The Taumata Reservoir acts as an emergency source and is valved out from daily operational

contribution to the reticulation system. The total capacity is 3,846m³ but the outlet to the reservoir is

approximately 600mm off the floor meaning that not all of this is practically useable. This reservoir is

moderately critical and is necessary only on high water demand or emergency situations.

High Level Storage

The capacity of the treated water reservoirs and most of the high level storage tanks is adequate for

future projected demand and to meet the storage requirements for the New Zealand Fire Fighting

Code of Practice.

GCWS Distribution: Capacity & Criticality Pump Stations

Waipaoa City Pumps

Unlike Waingake, all water produced at Waipaoa must be pumped to be delivered to town. These

delivery pumps are therefore very highly critical. These pumps are able to deliver up to 720m³/h at

normal operating pressures of around 1000kPa.


The Makaraka Booster Pump Station was built in 1980 and is located beside the railway line at

Makaraka, approximately 2 km from the City boundary. The Makaraka Booster Pump Station

provides additional boosting of the water from the Waingake Water Treatment Plant where the limit

of gravity flow is 840m³/hr, with maximum flow with the booster pumps being 1,200m³/hr if suction

pressures are maintained at self imposed limits.

Water will continue to be supplied to the city should Makaraka become unavailable, albeit at a

reduced level. In summer this flow would be insufficient to meet the city demands. This pump station

has a high criticality rating.


The Ormond Road Booster Pump Station is highly critical as it contributes three fold to the overall

asset operation.

During summer this pump station is essential to maintain Knob hill reservoir levels

Ormond road allows a consistent pumping pressure at Makaraka Booster to be achieved

It negates the need for high pressures in the reticulation to be achieved in order to

maintain levels in the major storage reservoirs of Knob and Hospital Hill


This pump station has a low criticality because of two reasons:

It is not used as an online booster pump. Fills/flushes the reservoir only.

Pump station is capable of being bypassed if diesel motor fails to run. Carry out old Fulton

Hogan valving procedure to send more water towards the hospital reticulation area.


The capacity of the Booster Pump Stations and the high level pump stations is adequate for the

projected future demand.

These pump stations are highly critical as they ensure that the fire fighting code of practice is

achieved and the reticulated supply would be unable to supply these high level subdivisions solely on

delivery pressures to the city .

GCWS Distribution: Life

Future life of the storage facilities varies. These are all being depreciated. As these stations near



n-49637 Page 102

Install Date Structure Age Base Life Remaining Life

1/01/1969 Pah Hill 39.5 63 23.0

1/01/1933 Taumata Reservoir 75.5 100 24.5

1/01/1992 Einstein St 16.5 50 33.5

1/01/1990 Hauroa Rd 18.5 63 44.0

1/01/1991 Gaddums Hill 17.5 63 45.0

1/01/1994 Hill Rd 14.5 63 48.0

1/01/1964 Knob Hill Reservoir 44.5 100 55.5

1/01/1991 Hospital Hill Reservoir 17.5 78 60.6

GCWS Distribution: Life Pump Stations

Future life of the pump stations varies. These are all being depreciated. As these stations near


Install Date Structure Age Base Life Remaining Life

1/01/1980 Makaraka Booster Pump Stn 28.5 63 34.0

1/01/1990 Waipaoa T/Plant - Filter Pump Stn 18.5 63 44.0

1/01/1998 Ormond Booster Pump Stn 10.5 63 52.0

30/06/2000 Hillview Tce Booster pump station 8.0 63 54.5

30/06/2006 Taumata Reservoir Booster Pump Station 2.0 63 61.0

GCWS Reticulation Pipework: Condition Trunk Mains

The line is fully cathodic protected and additional external wrapping was provided as part of the

construction requirement. This line is recently constructed and is in very good condition, with no

major maintenance or work envisaged within the next 50 years.

The largest portions of the pipeline are located within road reserve, but in sections closer to

Makaraka extend through private property and the provisions for access and maintenance are

covered within the Local Government Act.

For valuation purposes the distribution main has been included in the overall pipe system. Most

failures that have resulted have been a result of mechanical failure of somebody hitting or digging up

the pipe. Some corrosion has occurred but was picked up as part of the Cathodic Protection work,

other failures have been minimal, and in two cases as a consequence of misalignment of the pipe.

Some factors needed for consideration when assessing the pipe condition are the following:

Rate of leaching from the concrete lining of the Trunk Main

Pitting of the steel

Exposure to the elements causing corrosion (Cathodic Protection does not work in this

situation)


n-49637 Page 103

It is anticipated to take strategic samples and undertake metallurgic testing to predict future life

expectancy.

The Waingake line crosses a number of pipe bridges and self supporting spans. The condition of

these is very good.

Every joint (averaging 7 m) from the Mangapoike Dams to the City boundaries was excavated as part

of the bonding required for Cathodic Protection. This provided the opportunity to undertake repairs

on the gibault joints and to repair an external corrosion evident on sections of pipe. From this

extensive work undertaken in 1990-91 additional assurances on the condition has been gained. We

believe that the expected life of this pipe will exceed 50 years and will coincide with felling of the

trees on the pipeline corridor used to protect the pipeline and will prove a source of funding for

replacement should that be appropriate at that time. At this future time it will also be opportune to

review the future City demands and the requirements for additional dam storage in the Puninga

Basin, which if required would increase the size of the supply mains. These are decisions we believe

are beyond the requirements of the asset management plan, other than to identify the review period

and will be best made in future asset management plans.

Waingake Line Waipaoa Line

Installation Date 1940s 4/91

Material Concrete lined steel Concrete lined steel

Jointing Gibault Gibault

Length 29.6 km 6.10 km

Pipe Bridges 9 0

Pipe Spans 3 0

Cathodic Protection Yes Yes

From To Diameter Type Install Length

Clapcott DLB 300 ST-Conc 1949 1 km

HC Williams DLB/Clapcott 450 ST-Conc 1974 170

DLB Bush Intake 450 ST-Conc 1949 5

Bush Intake Waingake 450 ST-Conc 10/10/88 4

Waipaoa Intake Settlement Ponds 400 ST-Conc 1990 150

GCWS Reticulation Pipework: Condition Reticulation

The asset capacity and performance has been reviewed extensively as part of a network analysis

undertaken by Beca Steven‟s for earlier Activity Management Plans, reviewing the levels of service

relative to Council‟s legal requirements for fire fighting and a targeted level of 300kPa residual

pressure with a flow of 40 litres per minute for domestic supply. This clearly indicated the capacity

related problems and demonstrated that clearly the over-riding factor for performance of the

reticulation is for the purposes of fire fighting rather than the specific demand placed on it from

consumers. This information provided the basis and decision by Council to upgrade the existing cast

iron pipes by using hydrant flow testing to identify mains requiring relining. As a result of this testing

three categories for levels of service for the cast iron pipes was established, these are:

GCWS Reticulation Pipework: Condition Reticulation Components

As part of the specification for these components, considerable effort has focused on both internal

and external corrosion issues, and Council has used high quality, high efficient components, and

included several levels of corrosion mitigation and even considers the construction of the

components with respect to electrical potential, longevity of the coating systems, their scratch


n-49637 Page 104

resistant nature and the requirement to provide additional protective wrapping on the external areas

of those components.

Council uses raised pavement markers (commonly known as cats eyes), for the identification of fire

hydrants by using a blue reflector and has proven very successful in assisting the fire service. These

are beyond the legal requirements for identification markings for fire hydrants according to the SNZ

PAS 4509:2008 New Zealand Fire Service Fire Fighting Water Supplies Code of Practice but the use

of them will be continued.

GCWS Reticulation Pipework: Performance

As part of on-going maintenance monthly measuring of cathodic potential readings, a bi-annual walk-

over of the pipeline and an annual leak detection are currently undertaken. The pipeline is seen as a

critical asset and future advanced risk management investigations will be required. As part of post-

Cyclone Bola a lot of work was undertaken to reduce the risk of damage to this line, and we believe

that this has effectively minimised the risk of failure to a satisfactory level. This will however not

negate further investigation as part of strategic planning.

Very few easements exist for the pipeline, however provision within the Local Government Act protect

and provide access for maintenance purposes of the pipeline. The largest portion of the pipeline has

been located within road reserve, but in sections closer to Makaraka extends through private

property. Some access agreements have been established with some of the owners, specifically

Opou Station, in all cases the pipe is not located on Council land.

All pipelines have control valves and air valves associated with it, which require regular inspection to

ensure their efficient performance and are part of routine maintenance procedures.

Scour valves are provided at strategic locations to allow drainage of the line should any maintenance

be required. Consent to discharge water from this has been provided for as a “permitted activity”

within the district plan.

As part of the protection programme of the supply and distribution mains, Cathodic Protection was

constructed to reduce the external corrosion of the concrete lined steel pipes. A number of beds

exist at strategic locations and we believe we have and continue to successfully extend the life of the

supply mains. The Cathodic Protection system is a series of zinc anode beds linked to a power

rectifier to induce a ground potential, to reduce the corrosion of the pipe. The rectifiers and potential

of the main is regularly monitored by Council staff, with levels fluctuating dependent on the ground

moisture conditions. On-going maintenance is required to check the performance of the cathodic

system with replacement of the anode beds nearing completion at the time of writing this Activity

Management Plan. This was started in 2005/06 and all anode beds have been replaced apart from

two sites. These will be partly upgraded to increase life and performance by December 2008.

The Cathodic Protection requires permanent supply of electricity and has an on-going annual cost as

a consequence. These costs have been allowed for in the future maintenance for the cathodic

system.

The performance of the Cathodic Protection apart from the area identified is meeting all design

requirements and is still operating well. The results from monitoring are sent on a bi-annual basis to

the original supplier to validate readings and results that have been recorded for any additional

comment on the performance of this system.

On the section of pipe known as Damline extension which covers the length from the top of the

Tarewa-Tokanui Road known as the divide, down to the Te Arai Bush intake, provides the opportunity

for micro-hydro generation and during earlier years, a report was commissioned to look at these

issues. This report was presented to Gisborne District Council and it was agreed that not being a

core business of Council, that the option of generation would be first offered to Eastland Energy, and

for them to make a proposal based on a number of scenarios, and further economic analysis.


n-49637 Page 105

This report has now been superseded by a report produced by Power Solutions Ltd and facilitated by

Economic Development: GDC.

As part of the capacity performance review of the City reticulation, a full network analysis was

undertaken; An Overview of Gisborne Network Analysis dated January 1998 was undertaken by Beca

Stevens. This has now been superseded by the development of the OPUS Hydraulic Water Model

which was the result of studies and monitoring during 2006/07.

A current level of service of 300 kPa residual pressure with a flow of 40 litres per minute for

domestic supply was used. This clearly indicated any capacity related problems and demonstrated

that the over-riding factor for performance of the reticulation is for the purposes of fire fighting rather

than the specific demand placed on it from consumers. Although the overall capacity of the network

was found to be adequate some capacity enhancing work on cast iron mains was identified as well

as specific capital development works.

??? identifies renewals required to meet domestic levels of service as they currently exist and the

upgrades required. These upgrades consider future demand and account for those as part of the

upgrade. For the purposes of this asset management plan meeting the existing levels of service is

the basis for this plan, and therefore these upgrades are included within the 10 year financial

window.

GCWS Reticulation Pipework: Capacity & Criticality

The pipeline has additional capacity should additional pumping be placed on the main; however this

will require pumping at the Te Arai Bush intake to prevent water from the Damline exiting through

that intake.

GCWS Reticulation Pipework: Life

Material

Typical Failure Mode

Estimated Average Service

Life (years)

CI (Cast Iron) Flow restriction due to tuberculation.

Failure of lead joints. 100

Steel (Concrete lined) External Corrosion due to reaction with some soils.

Internal abrasion. 100

Concrete Pipe Weakening of pipe wall.

Failure of joints. 60

AC (Asbestos Cement) Softening of pipe wall.

Splits/cracks due to ground movement. 60

GI (Galvanised Iron) External corrosion due to reaction with some soils.

Flow restriction due to tuberculation. 50

up Fractures due to pressure fluctuations.

Solvent joints with shear movement. 90

HDPE (High density polyethylene) Poor installation. 100

LDPE (Low density polyethylene) Failure of joints.

Fatigue. 30

Spiral Welded Steel (Concrete

lined) Poor welds. Damaged protective coatings. 100

Ductile Iron Damaged protective coatings. 100

Copper Corrosion due to reaction with soils and corrosive

water. 80

Figure 1- Typical Pipe Failure and Estimated Average Service Life


n-49637 Page 106

AC Pipe – Data on life expectancies do vary with diameter of pipe. This is due a number of factors

that have been assessed on a national level. In 2001 New Zealand Water and Waste Association

compiled an Asbestos Cement Water Main manual. Life expectancies of varying pipe sizes are

summarised below. These ages are pressure dependant, a working pressure of 600kPa has been

assumed.

AC pipe diameter (mm) Class National Average Life Expectancy (Years) Gisborne City Life Expectancy (Years)

50 E/F 38 40

80 C 42 44

100 C 51 54

150 C 59 62

200 C 67 70

250 C 76 80

300 C 90 95

375 C 111 117

CI main not identified for epoxy lining have had life extension condition factors applied. These factors

have been calculated to increase the pipe life (to be outside the 20y window or +20y).

Te Karaka Water Supply (TKWS)

TKWS Treatment: Condition

Treatment Station Water quality is far better than that contained in the consumer‟s rainwater tank. Unfortunately the

NZDWS do not recognise this and require a higher standard that is greatly diminished when

discharged in the tanks. These issues have yet to be resolved with the Chief Medical Health Officer

on the quality that Council will supply to a top up rain water system. If the full TAP & CAP application

is successful, than the water quality should improve immensely. Also, the supply will change to a full

mains water supply system taking out the risk of contamination via the rainwater tanks. This

application is due by November 2008.

Supply Pump Stations This pump station is of metal and concrete construction and has a submersible pump. The condition

of the pump station is moderate. The housing shed is sound and has had recently been replaced.

This work has been carried out in 2007 including strengthening the base of the walls and door of the

pump station. The door periodically is vandalised as attempts to break in occur.

The pump is new in 2005 and is in very good condition.

The well is inspected annually as the bore pump is removed. The condition of this bore has

deteriorated with the high mineral content in the water however it remains good.

TKWS Treatment: Performance

Treatment Station The supply is provided from a bore on the outer stop bank of the Waipaoa River and is pumped from

the bore into a pressure tank, and fed directly to the town. This has subsequently been upgraded

and a Cumary filter has been added, which introduces oxygen into the water supply to assist in iron,

and manganese removal, which is taken out as part of the filtration process. This is then chlorinated

and pumped through pressure tanks to the consumer.


n-49637 Page 107

The system operates on pressure differentials to ensure flows to the reticulation system are suitable.

The interrelationship of the treatment components is critical so a treatment system operation

manual has been developed to aid the capture of corporate knowledge.

Supply Pump Stations The performance of this pump station is unusual. The bore pump operates not only as a supply

pump but also in a pressure pump capacity. It has a high number of up to 30 starts per hour. The

performance of this pump station requires review with funding in Central governments Technical

Assistance Programme (TAP) being considered as a funding source for this work.

In theory this pump station should only operate in summer where water sourced from the domestic

roof is insufficient to meet the domestic demand. This has not been realised as a result of issues

within the reticulation.

TKWS Treatment: Capacity and Criticality

Treatment Station Few complaints are received on the performance of the system. When complaints have been

received investigations have shown that a number of consumers are not complying with the

conditions of the supply. This is a result of not maintaining their own roof water system to ensure

that the Council supply only acts as a supplementary supply and not their main source of water.

Supply Pump Stations The current pump station operates satisfactorily to deliver water to residents. The pump station is

critical as the system has no storage other than individual‟s tanks and if the pump station fails the

system can not operate to supply water.

In some cases non compliance still remains unresolved and will not be pursued until the water

quality issues have been resolved with the Chief Medical Health Officer on the quality that Council

will supply to a top up rain water system.

The capacity and performance of the system consequently at times appears not to meet the 1000

litres of water per property per day. On investigation it would appear in fact that the water quantity is

met and is more a reflection of consumer expectation to a higher level of service than that for which

the system was originally designed. Given that the reducing population, the move to a higher rental

status of properties, it is unlikely that the rate payers would be prepared to fund any capacity

increases to a higher level of service, and focus will be more on internal management of their own

systems. Further meetings on levels of service will need to be held with the consumers following the

enforcement of new drinking water standards following the Health (Drinking Water) Amendment Act

2007.

TKWS Treatment: Life

Treatment Station The treatment system has 9 years remaining life. This has been estimated from the installation date

and the original design life being 35 years.

Replacement will be funded depending on the success of the TAP & CAP application.

Supply Pump Stations The pump station has 9 years remaining life. This has been estimated from the installation date and

the original design life being 35 years.


n-49637 Page 108

TKWS Reticulation: Condition

The reticulation system was constructed of low density polyethylene (LDPE) with mechanical

couplers and it is anticipated that the economic life for this reticulation is 35 years which leaves a

figure for remaining life of 9 years. PVC is also present in the Te Karaka reticulation and the

economic life for this is 80 years which leaves a figure for remaining life of 54 years. With the

introduction of the filtered water system and high level removal of iron and manganese these

residue deposits which exist within the reticulation are being removed as part of on going

maintenance and believed will ensure that the economic life for this system can be achieved. Leak

detection work is also on going to identify any leaks which we believe would substantially diminish

the capacity of the reticulation, but to date no identifiable leaks have been found. This work will be

on going.


As part of the specification for these components, considerable effort has focused on both internal






The poor water quality of the source water does cause significant build up of iron deposits on the

reticulation.

TKWS Reticulation: Performance

While an increasing number of people are questioning the performance of the top up water supply,

they remain a small percentage. Investigations have shown that a number of consumers are not

complying with the conditions of supply, nor maintaining their own roof water system to ensure that

the Council supply only acts as a supplementary supply and not their main source of water.

Investigations have clearly shown a high level of abuse and non-compliance has been on going.

The performance is largely dependant on private users. Water from the pump station travel through

the reticulation to the toby which has a restrictor in it onto the property through a ballcock system

and into the private storage tank.

Conditions of supply are;

The supply is supplementary, a primary source still needs to be provided (typically rainwater)

There needs to be a restrictor of 1m³/day in place (in reality this is a 1.5m³ as the low

pressure reduces supply further)

A ballcock 600mm off the bottom of a 25000 lt tank so that flow is received only when tank

volumes are low

A summary of inspections conducted in 2006 indicated that individual property owner had modified

68% of the connections, but after 2007 inspections, that number was down to 41%. Modification

included restrictor removed, ballcocks removed, illegal connections and no primary water source. In

some case the water supply was simply overflowing the water tanks to ground.

Due to these problems water flows to some individuals are limited as effectively the system has

continuously flowing leaks.

Letters of notification to rectify these problems have been issued however repeated inspection will

need to be required to ensure individual connections comply.


n-49637 Page 109

Flow rates have also been observed by residents to decline over the last 5 years. This is possibly due

to tuberculation occurring from high iron and manganese levels in the reticulated water or the

installation of new restrictor units. These were replaced due to tampering and a worn orifice.

TKWS Reticulation: Capacity and Criticality

The current system will meet the required demands for the foreseeable future.

TKWS Reticulation: Life

Material


Estimated Average

Service Life (years)

PVC Fractures due to pressure fluctuations.

Solvent joints with shear movement.

80

LDPE Failure of joints. Fatigue. 35

Whatatutu Water Supply (WTWS)

WTWS Treatment: Condition

Treatment Station Water quality is far better than that contained in the consumer‟s rainwater tank. Unfortunately the

NZDWS do not recognise this and require a higher standard that is greatly diminished when

discharged in the tanks. These issues have yet to be resolved with the Chief Medical Health Officer

on the quality that Council will supply to a top up rain water system. If the full TAP & CAP application

is successful, than the water quality should improve immensely. Also, the supply will change to a full

mains water supply system taking out the risk of contamination via the rainwater tanks. This

application is due by November 2008.

Supply Pump Stations This pump station is of metal and concrete construction and has a submersible pump. The condition

of the pump station is moderate. The housing shed is sound and has had repairs as required. The

door periodically is vandalised as attempts to break in occur.

The pump is new in 2005 and is in very good condition.

The well is inspected annually as the bore pump is removed. The condition of this bore has

deteriorated with the high mineral content in the water however it remains good.

WTWS Treatment: Performance

Treatment Station


n-49637 Page 110

Water treatment consists of a Cumary filter, which introduces oxygen into the water supply to assist

in iron, and manganese removal, which is taken out as part of the filtration process. Water is then

chlorinated.

The system operates on pressure differentials to ensure flows to the reticulation system are suitable.

The interrelationship of the treatment components is critical and not well understood due to a lack of

familiarity. A treatment system operation manual has been developed to aid the capture of corporate

knowledge.

Given that the reducing population, the move to a higher rental status of properties, it is unlikely that

the ratepayers would be prepared to fund any capacity or quality increases. Focus will be more on

internal management of their own systems. Further meetings on levels of service will need to be held

with the consumers following the enforcement of new drinking water standards following the Health

(Drinking Water) Amendment Act 2007 and results of submitting the Whatatutu Water Supply

PHRMP for the CAP application.

Supply Pump Stations The performance of this pump station is unusual. The bore pump operates not only as a supply

pump but also in a pressure pump capacity. It has a high number of up to 30 starts per hour. The

performance of this pump station requires review with funding in Central governments Technical

Assistance Programme (TAP) being considered as a funding source for this work.

In theory this pump station should only operate in summer where water sourced from the domestic

roof is insufficient to meet the domestic demand. This has not been realised as a result of issues

within the reticulation.

WTWS Treatment: Capacity and Criticality

Treatment Station Few complaints are received on the performance of the system. When complaints have been

received investigations have shown that a number of consumers are not complying with the

conditions of the supply. This is a result of not maintaining their own roof water system to ensure

that the Council supply only acts as a supplementary supply and not their main source of water.

Supply Pump Stations The current pump station operates satisfactorily to deliver water to residents. The pump station is

critical as the system has no storage other than individual‟s tanks and if the pump station fails the

system can not operate to supply water.

WTWS Treatment: Life

Treatment Station The treatment system has 7 years remaining life. This has been estimated from the installation date

and the original design life being 35 years. Replacement will be funded depending on the success of

the TAP & CAP application.

Supply Pump Stations The pump station has 7 years remaining life. This has been estimated from the installation date and

the original design life being 35 years.


n-49637 Page 111

WTWS Reticulation: Condition

The reticulation system was constructed of low density polyethylene (LDPE) with mechanical

couplers and it is anticipated that the economic life for this reticulation is 35 years which leaves a

figure for remaining life of 7 years. PVC and GALV are also present in the Whatatutu reticulation and

the economic lives for these are 80 years and 35 years respectively which leaves a figure for

remaining life of 54 years and 7 years respectively. With the introduction of the filtered water system

and high level removal of iron and manganese these residue deposits which exist within the

reticulation are being removed as part of on going maintenance and believed will ensure that the

economic life for this system can be achieved. Leak detection work is also on going to identify any

leaks which we believe would substantially diminish the capacity of the reticulation, but to date no

identifiable leaks have been found. This work will be on going.

The condition of the reticulation reflects its age. No sampled condition assessment has occurred on

this network. Most failures are difficult to pick up due to the low pressure system operating. As part

of the renewal programme the system will be condition rated and tested for leakage.

Reticulation Components As part of the specification for these components, considerable effort has focused on both internal






The poor water quality of the source water does cause significant build up of iron deposits on the

reticulation.

WTWS Reticulation: Performance

The performance is largely dependant on private users. Water from the pump station travels through

the reticulation to the toby which has a restrictor in it onto the property through a ballcock system

and into the private storage tank.

Conditions of supply are;

The supply is supplementary; a primary source still needs to be provided (typically

rainwater)

There needs to be a restrictor of 1m³/day in place (in reality this is a 1.5m³ as the low

pressure reduces supply further)

A ballcock 600mm off the bottom of a 25000 lt tank so that flow is received only when

tank volumes are low

A 2007 survey indicated that individual property owner had modified 43% of the connections.

Modification included restrictor removed, ballcocks removed, illegal connections and no primary

water source. In some case the water supply was simply overflowing the water tanks to ground.

Due to these problems water flows to some individuals are limited as effectively the system has

continuously flowing leaks.

Letters of notification to rectify these problems have been issued however repeated inspection will

needs to be required to ensure individual connections comply.


n-49637 Page 112

WTWS Reticulation: Capacity and Criticality

The current system will meet the required demands for the foreseeable future.

WTWS Reticulation: Life

Material


Estimated Average

Service Life (years)

GI (Galvanised Iron) External corrosion. Flow restriction due to tuberculation. 35

PVC Fractures due to pressure fluctuations. Solvent joints with

shear movement. 80

LDPE Failure of joints. Fatigue. 35

Figure 2- Typical Pipe Failure and Estimated Average Service Life


n-49637 Page 113

Appendix C – Financial Information

2009-2019 - Capex Schedules

Total

2008-09

2009-10

2010-11

2011-12

2012-13

2013-14

2014-15

2015-16

2016-17

2017-18

2018-19

Justification sheet

PHRMP Ref.

PHRMP Priority DETAILS

Project

Cost

Annua

l Plan

Year 1

Year 2

Year 3

Year 4

Year 5

Year 6

Year 7

Year 8

Year

9

Year 10


CX1

Waingake TP: Baffles in CWR

$ 80,0

00

$ 80,000

$ -

$ -

CX2

Waingake TP: UVT installation (In previous LTCCP)

$ 65,0

00

$ 400,00

0

$ 65,0

00

CX3

Waipaoa TP: UVT installation (In previous LTCCP)

$ 145,000

$ 90,000

$ 145,000

CX4 B

Extreme

Distribution: Hospital Hill Cl2 circ. Improvements

$ 115,000

$ 25,000

$ 90,0

00

CX5

Rural Townships: Te Karaka WS upgrades

$ 250,000

$ 250,00

0

CX6

Rural Townships: Whatatutu WS upgrades

$ 250,000

$ 250,00

0


CX7

Distribution: Additional meters and valves for efective Demand management investigation

$ 36,6

00

$ 36,6

00

CX8

Distribution: Universal Metering

$ 4,000,00

0

$ 100,000

$ 1,900,000

$ 2,000,000

CX9

Waingake Catchment: Williams dam storage increase

$ 1,026,19

8

$ 40,0

00

$ 986,198


CX10 U

Medium

Waingake Catchment: Clapcott supply main replacement

$ 729,280

$ 100,000

$ 629,280

Fire Fighting Compliance: SNZ PAS 4509:2008 Projects

CX11

Distribution: Fire-fighting upgrade (In previous

$ 481,280

$69,88

0

$ 69,880

$ 411,400


n-49637 Page 114


Total

2008-09

2009-10

2010-11

2011-12

2012-13

2013-14

2014-15

2015-16

2016-17

2017-18

2018-19

Justification sheet

PHRMP Ref.


Project

Cost

Annua

l Plan

Year 1

Year 2

Year 3

Year 4

Year 5

Year 6

Year 7

Year 8

Year

9

Year 10

LTCCP) c/o into 201

1-12

CX12

Bulk Distibution: Western industrial Ring Main (In previous LTCCP)

$ 1,074,18

2

$369,080 c/o

into 200

9-10

$ 1,074,18

2

Operational Asset Management Projects

CX13 P

High

Distribution: Telemetry for Gaddums Hill & Hauroa Rd reservoirs

$ 33,3

80

$ 33,380

CX14

AA

Low

Waingake TP: Filter to waste facility

$ 126,460

$ 126,460

CX15 Y

Low

Waingake TP: Flow switches for Chemical dosing.

$ 39,5

90

$ 39,590

CX16 Z

Low

Waipaoa TP: Install streaming current meter

$ 47,5

60

$ 47,560

CX17

Waingake TP: Backwash Discharge Treatment issues

$ 20,0

00

$ 20,0

00

Emergency Response Planning Projects

CX18 J

High

Waingake TP: Seismic restraints for chemical bulk storage tanks

$ 53,6

15

$ 53,615

CX19 L

High

Waipaoa TP: Seismic restraints for chemical bulk storage tanks

$ 53,6

15

$ 53,615

Asset Renewal Projects

CX20

Distribution: Pipe Renewals [Asbestos main replacement (In previous LTCCP)]

$ 1,623,72

5

$ 52,500

$ 20,9

00

$ 39,100

$ 74,2

21

$ 82,6

57

$ 25,760

$ 43,1

48

$ 550,000

$ 310,000

$ 477,939

CX21

Waingake Catchment: Renew Power Poles (In previous LTCCP)

$ 125,000

$26,87

5 c/o

into 200

9-

$ 125,000


n-49637 Page 115


Total

2008-09

2009-10

2010-11

2011-12

2012-13

2013-14

2014-15

2015-16

2016-17

2017-18

2018-19

Justification sheet

PHRMP Ref.


Project

Cost

Annua

l Plan

Year 1

Year 2

Year 3

Year 4

Year 5

Year 6

Year 7

Year 8

Year

9

Year 10

10

CX22

Distribution: Water Meter Renewals

$ 500,000

$ 50,000

$ 50,000

$ 50,000

$ 50,000

$ 50,000

$ 50,000

$ 50,000

$ 50,000

$ 50,000

$ 50,000

CX23

Waingake TP: Plant road re-seal renewal

$ 60,0

00

$ 60,000

Development Contributions Projects

CX24

Development Contributions:Taruheru block water (In previous LTCCP)

$ 1,018,87

5

$ 92,625

$ 92,6

25

$ 92,625

$ 92,625

$ 370,500

$ 370,500

CX25

Development Contributions: Construct Knob Hill Booster Station & Reservoir Supply Main

$ 1,300,00

0

$ 100,00

0

$ 600,000

$ 600,000

CX26

Development Contributions: Local Urban Upgrades

$ 250,000

$ 25,0

00

$ 25,000

$ 25,000

$ 25,000

$ 25,0

00

$ 25,000

$ 25,0

00 $ 25,000

$ 25,000

$ 25,000

Total Cost

$ 13,504,3

60

$ 1,714,30

7

$ 451,00

5

$ 758,83

5

$ 1,767,58

1

$ 757,657

$ 200,76

0

$ 1,157,92

8

$ 1,771,19

8

$ 2,285,00

0

$ 2,640,08

9

2009-2019 OPEX Schedules

Total

2008-09

2009-10

2010-11

2011-12

2012-13

2013-14

2014-15

2015-16

2016-17

2017-18

2018-19

OPEX ID

PHRMP Ref.


Project

Cost

Annual

Plan

Year 1

Year 2

Year 3

Year 4

Year 5

Year 6

Year 7

Year 8

Year 9

Year 10


OPX 1

BB Extreme

Distribution: Procedure for bulk addition of chemicals into city reservoirs

$ 5,000

$ 5,00

0

OPX 2

not identified

Rural Townships: Whatatutu Water Supply Improvements: Design and

$ 20,00

0

$ 20,0

00


n-49637 Page 116


Total

2008-09

2009-10

2010-11

2011-12

2012-13

2013-14

2014-15

2015-16

2016-17

2017-18

2018-19

OPEX ID

PHRMP Ref.


Project

Cost

Annual

Plan

Year 1

Year 2

Year 3

Year 4

Year 5

Year 6

Year 7

Year 8

Year 9

Year 10


OPX 3

not identified

Rural Townships: Te Karaka Water Supply Improvements: Design and Supervision (subject to CAP funding)

$ 20,00

0

$ 20,0

00

$ -

Asset Maintenance Projects

OPX 4

not identified

Bulk Distribution: Recondition of Makaraka Pumps

$ 13,50

0

$ 13,5

00

OPX 5

not identified

Bulk Distribution: Te Arai Pipe Bridge repairs

$ 73,50

0

$ 73,500

OPX 6

not identified

Distribution: Hospital Hill waveband (Design & Built, 5year priority)

$ 100,0

00

$ 10,0

00

$ 90,000

OPX 7

not identified

Distribution: Hospital Hill reservoir sealing (2 year priority )

$ 171,5

00

$ 50,000

$ 53,500

$ 68,000

OPX 8

not identified

Distribution: Knob Hill reservoir sealing (2 year & 10 year Priority)

$ 133,0

00

$ 98,000

$ 35,000

OPX 9

not identified

Waingake Catchment: Clapcott dam lining

$ 30,57

0

$ 30,570

$ -

OPX 10

not identified

Waingake Catchment: Williams dam sealing and spillway repairs

$ 82,04

0

$ 82,040

OPX 11

D

High

Waipaoa TP: Bird scaring mechanism at sed ponds

$ 6,860

$ 6,86

0

OPX 12

T

High

Waipaoa TP: Protection of Tanker Filling Point

$ 5,150

$ 5,15

0

OPX 13

Connect intake pump station to emergency generator supply

$ 15,00

0

$ 15,0

00


OPX 14

not identified

Distribution: Levelling of City reservoirs

$ 10,00

0

$ 10,0

00

OPX 15

DS High

Distribution: Water Model Calibration

$ 50,00

0

$ 50,0

00


n-49637 Page 117


Total

2008-09

2009-10

2010-11

2011-12

2012-13

2013-14

2014-15

2015-16

2016-17

2017-18

2018-19

OPEX ID

PHRMP Ref.


Project

Cost

Annual

Plan

Year 1

Year 2

Year 3

Year 4

Year 5

Year 6

Year 7

Year 8

Year 9

Year 10

OPX 16

not identified

Water Utility: Establish Demand Management Plan

$ 50,00

0

$ 50,0

00

OPX 17

FQ Medium

Water Utility: Draught Management Plan

$ 20,00

0

$ 20,0

00

OPX 18

DQ High

Bulk Distribution: Model scenarios & Field work to improve operation of Makaraka Booster station

$ 20,00

0

$ 20,0

00


$ -

OPX 19

not identified

Water Utility: Sanitary Assessment

$ 20,00

0

$ 20,0

00

OPX 20

CZ High

Water Utility: Asset Componentry: Overall Strategy

$ 10,00

0

$ 10,0

00

OPX 21

CZ High

Water Utility: Asset Componentry Condition Assessment & Renewals Program. 1 FTE for 24months

$ 75,00

0

$ 75,000

OPX 22

not identified

Waingake Catchment: Pipe bridges condition assessments

$ 20,00

0

$ 20,0

00

OPX 23

EU High

Distribution: Criticality Analysis of Reticulation network

$ 15,00

0

$ 15,0

00

OPX 24

not identified

Waingake Catchment: Hydro Electric Feasibility Study (25% of $28k)

$ 7,000

$ 7,00

0

Fire Fighting Compliance: SNZ PAS 4509:2008 Projects

$ -

OPX 25

GD Medium

Distribution: NZFS flow capability assessment (utilising Water Model)

$ 50,00

0

$ 50,0

00

Operational Asset Management Projects

$ -

OPX 26

GQ Low Bulk Distribution: Establish scouring procedure for bulk main in light of first customer non compliance

$ 7,000

$ 7,000

Emergency Response Planning Projects

$ -

OPX 27

BM High

Water Utility: Emergency Response Plan

$ 30,00

0

$ 30,000


n-49637 Page 118


Total

2008-09

2009-10

2010-11

2011-12

2012-13

2013-14

2014-15

2015-16

2016-17

2017-18

2018-19

OPEX ID

PHRMP Ref.


Project

Cost

Annual

Plan

Year 1

Year 2

Year 3

Year 4

Year 5

Year 6

Year 7

Year 8

Year 9

Year 10

Water Quality Projects (predominantely referring to climate change)

$ -

OPX 28

BL High

Waingake Catchment: Algae Management Plan

$ 20,00

0

$ 20,0

00

OPX 29

FS Medium

Waipaoa Catchment: Review Intake screens performance

$ 9,000

$ 9,000

OPX 30

FW Medium

Waingake Catchment: Develop programme for silt monitoring

$ 8,000

$ 8,000

OPX 31

BG High

Waipaoa Catchment: Sanitary Survey

$ 10,00

0

$ 10,0

00

OPX 32

C

High

Waingake Catchment: Flushing of intake screen if sedimantation occurs

$ 7,000

$ 7,00

0

Asset Renewal Projects

$ -

OPX 33

not identified

Pipe Condition Assessment Project

$ 100,0

00

$ 10,0

00

$ 10,0

00

$ 10,0

00

$ 10,0

00

$ 10,0

00

$ 10,000

$ 10,000

$ 10,000

$ 10,000

$ 10,000

OPX 34

not identified

Pipe Renewals Programming Project

$ 15,00

0

$ 5,00

0

$ 5,000

$ 5,000

OPX 35

not identified

Develop Activity Management Plan

$ 45,00

0

$ 15,0

00

$ 15,000

$ 15,000

$ 1,274,120

$ -

$ 302,540

$ 442,580

$ 145,000

$ 120,000

$ 115,000

$ 39,000

$ 18,000

$ 17,000

$ 30,000

$ 45,000


n-49637 Page 119

Summary of Forecasted Financial Performance for the Ten Years 2010 to 2019 2010

$'000

2011

$'000

2012

$'000

2013

$'000

2014

$'000

2015

$'000

2016

$'000

2017

$'000

2018

$'000

2019

$'000

WATER SUPPLY

Operations

Operating revenue

Activity revenue -

1,515

-

1,560

-

1,604

-

1,647

-

1,701

-1,751 -

1,812

-

1,868

-

1,928

-

1,992

Grants & subsidies 0 0 0 0 0 0 0 0 0 0

Other revenue 0 0 0 0 0 0 0 0 0 0

Total operating revenue -

1,515

-

1,560

-

1,604

-

1,647

-

1,701

-1,751 -

1,812

-

1,868

-

1,928

-

1,992

Operating expenditure

Depreciation 1,887 1,947 2,002 2,059 2,129 2,192 2,275 2,349 2,427 2,572

Interest 82 84 89 98 97 96 95 92 156 289

Operating costs 2,749 3,084 3,027 3,053 3,140 3,072 3,240 3,348 3,367 3,596

Total operating expenditure 4,718 5,115 5,118 5,210 5,366 5,360 5,610 5,789 5,950 6,457

Net internal charges/recoveries) 137 153 178 225 243 255 297 341 444 507

Net cost of service 3,340 3,708 3,692 3,788 3,908 3,864 4,095 4,262 4,466 4,972

Funded by:

Rates income -

3,340

-

3,708

-

3,692

-

3,788

-

3,908

-3,864 -

4,095

-

4,262

-

4,466

-

4,972

Transfers to/from reserves 0 0 0 0 0 0 0 0 0 0

Depreciation not funded 0 0 0 0 0 0 0 0 0 0

(Increase)/decrease in deficits carried

forward

0 0 0 0 0 0 0 0 0 0

Total operations funding -

3,340

-

3,708

-

3,692

-

3,788

-

3,908

-3,864 -

4,095

-

4,262

-

4,466

-

4,972

Capital

Capital outgoings

Asset purchases - Growth 26 27 37 203 180 616 429 58 555 1,025

Asset purchases - Increase level of service 150 0 155 0 0 0 0 0 0 0

Asset purchases - Maintain level of service 241 356 529 1,288 696 1,013 156 830 2,308 2,728

Total asset purchases 417 383 721 1,492 875 1,630 584 887 2,863 3,754

Loan repayments 78 86 89 101 111 112 120 122 127 226

Total capital outgoings 495 469 810 1593 986 1742 704 1009 2990 3980

Funded by:

Rates income 0 0 0 0 0 0 0 0 0 0

Development contribution income -219 -219 -219 -137 -137 -137 -137 -137 -129 -129

Transfers to/from development contribution

reserve

175 193 190 8 6 -406 -287 86 -307 -763

Capital grants & donations 0 -254 -260 0 0 0 0 0 0 0

Other capital revenue 0 0 0 0 0 0 0 0 0 0

Loan funding -169 -49 -255 -195 -12 -160 -49 -102 -

1,976

-

2,184

Transfer from depreciation reserve -281 -140 -267 -1,270 -843 -1,040 -231 -856 -578 -904

Transfer to/from other reserves -1 0 1 1 0 1 0 0 0 0

Total capital funding -495 -469 -810 -1593 -986 -1742 -704 -1009 -2990 -3980

\


n-49637 Page 120

Total Capital Projects

0

1,000

2,000

3,000

4,000

2010 2011 2012 2013 2014 2015 2016 2017 2018 2019

$000

Asset purchases - Growth Asset purchases - Increase level of serviceAsset purchases - Maintain level of service

Depreciation v Renewal Capital Projects

0

500

1000

1500

2000

2500

3000

2010 2011 2012 2013 2014 2015 2016 2017 2018 2019

$000

Renewal Cost Depreciation


n-49637 Page 121

Summary Operational Project Report – Current Projects 2009-2019 LTCCP

Priority Project LOS Description Total Cost 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019

Water Supply Operational

PRIMARY_D 530049 MAINT

100


- Analysis of Reticulation Network 15,000 15,000

SECF_50-54 530036 MAINT

100

Asset Maintenance Projects -

Williams Dam Sealing 82,040 82,040

SECF_50-54 530038 INC

100


Waipaoa Protection of Tanker Filling

Point

5,150 5,150

SECF_50-54 530052 INC

100

Operational Asset Management -

Scouring Procedure 7,000 7,000

SECF_50-54 530054 MAINT

100

Water Quality Projects - Waingake

Algae Management Plan 20,000 20,000

SECF_55-59 530030 MAINT

100


Recondition of Makaraka Pumps 13,500 13,500

SECF_55-59 530032 INC

100

Asset Maintenance Projects - Hospital

Hill Waveband 100,000 10,000 90,000

SECF_55-59 530033 MAINT

100

Asset Maintenance Projects - Hospital

Hill Sealing 171,000 53,000 50,000 68,000

SECF_55-59 530034 MAINT

100

Asset Maintenance Projects - Knob

Hill Reservoir Sealing 133,000 98,000 35,000

SECF_55-59 530035 MAINT

100


Clapcott Dam Lining 30,570 30,570

SECF_55-59 530040 INC

100

Demand Management Planning

Projects - Levelling City Reservoirs 10,000 10,000

SECF_55-59 530041 INC

100


Projects - Water Model Callibration 50,000 50,000

SECF_55-59 530042 MAINT

100


Projects - Establish Demand

Management Plan

50,000 50,000

SECF_55-59 530043 INC

100


Projects - Water Utility Draught

Management Plan

20,000 20,000


n-49637 Page 122



SECF_55-59 530044 INC

100


Projects - Makaraka Booster Station

Improvements

20,000 20,000

SECF_55-59 530046 INC

100


- Water Utility Asset Componentry 10,000 10,000

SECF_55-59 530048 MAINT

100


- Waingake Pipe Bridges

Assessments

20,000 20,000

SECF_55-59 530058 MAINT

100

Water Quality Projects - Intake Screen

Flushing 7,500 7,500

SECF_55-59 530059 MAINT

100

Asset Renewals Projects - Pipe

Condition Assessment 100,000 10,000 10,000 10,000 10,000 10,000 10,000 10,000 10,000 10,000 10,000

SECF_55-59 530060 MAINT

100

Asset Renewals Projects - Pipe

Renewals Programming 15,000 5,000 5,000 5,000

SECF_55-59 530061 MAINT

100

Asset Renewals Projects - Develop

Activity Management Plan 45,000 15,000 15,000 15,000

SECF_60-64 530028 MAINT

100

DWSNZ:2005 Compliance Projects -

Whatatutu Supply Improvements 20,000 20,000

SECF_60-64 530029 MAINT

100


Te Karaka Supply Improvements 20,000 20,000

SECF_60-64 530031 INC

100

Asset Maintenance Projects - Te Arai

Pipe Repairs 73,500 73,500

SECF_60-64 530039 INC

100

Asset Maintenance Projects - Pump

Station Emergency Connection 15,000 15,000

SECF_60-64 530047 INC

100


- Water Utility Assessment &

Renewals Program

75,000 75,000

SECF_60-64 530051 MAINT

100

Fire Fighting Compliance SNZ PAS

4509:2008 - NZFS Flow Assessment 50,000 50,000

SECF_60-64 530053 MAINT

100

Emergency Response Planning

Projects - Water Utility 30,000 30,000


n-49637 Page 123



SECF_65-69 530027 MAINT

100


Chemicals into City Reservoirs

Procedure

5,000 5,000

SECF_65-69 530045 MAINT

100


- Water Utility Sanitary Assessment 20,000 20,000

Totals: 1,233,260 225,540 344,650 285,570 120,000 105,500 50,000 10,000 17,000 30,000 45,000

Grand Total: 1,233,260 225,540 344,650 285,570 120,000 105,500 50,000 10,000 17,000 30,000 45,000


n-49637 Page 124

Summary Operational Project Report – Discontinued Projects 2009-2019 LTCCP

Priority Project LOS Description Total

Cost 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019


SECF_50-54 530055

Subreports

within

table/matrix

cells are

ignored.

Water Quality Projects - Waipaoa

Intake Screens Review

SECF_50-54 530056

Subreports

within

table/matrix

cells are

ignored.

Water Quality Projects - Waingake

Silt Monitoring Programme

SECF_55-59 530057

Subreports

within

table/matrix

cells are

ignored.

Water Quality Projects - Waipaoa

Sanitary Survey

SECF_60-64 530037

Subreports

within

table/matrix

cells are

ignored.


Establishment of Safe Communities 6,860 6,860

SECF_60-64 530050

Subreports

within

table/matrix

cells are

ignored.

Strategic Asset Management

Projects - Waingake Hydro Electric

Feasibility

Totals: 6,860 6,860

Grand Total: 6,860 6,860


n-49637 Page 125

Summary Project Report - Discontinued Projects 2009-2019 LTCCP


Water Supply

SECF_55-59 530007

INC

50

MAINT

50

Waingake Catchment : Williams dam

storage increase 1,254,949 47,840 1,207,109

SECF_55-59 530008 MAINT

100

Waingake Catchment : Clapcott

supply main replacement 869,519 116,900 752,619

SECF_55-59 530013 MAINT

100

Waingake Treatment Plant : Flow

switches for Chemical Dosing 50,834 50,834

SECF_55-59 530014 MAINT

100

Waingake Treatment Plant : Install

streaming current meter 61,067 61,067

SECF_55-59 530021 MAINT

100

Waingake Treatment Plant : Plant

road re-seal renewal 73,440 73,440

Totals: 2,309,809 116,900 800,459 1,280,549 111,901

Grand Total: 2,309,809 116,900 800,459 1,280,549 111,901


n-49637 Page 126

Appendix D – Risk Management Approach

Risk Assessments and Risk Management Reports

a. Stormwater

i. Stormwater Reticulation

b. Sewerage

i. Sewerage Reticulation

ii. Sewerage Treatment and Disposal

iii. Human Health Risk Assessment for the Gisborne city Wastewater Outfall

c. Water

i. Water Supply Pipeline

ii. Dams and Storage Reservoirs

iii. Public Health Risk Management Plan

1. Gisborne Water Supply PHRMP (Draft)

2. Te Karaka Water Supply PHRMP (Draft)

3. Whatatutu Water Supply PHRMP (Draft)

iv. Volcano-hydrologic hazards in the Waipaoa catchment.

v. GDC Emergency Management Response Plan for Bulk Water Pipeline

Failure (Draft)

d. Other

i. Plant and Motor Vehicles

ii. Staff and Industrial Relations

iii. Gisborne District Civil Defence and Emergency Services Volcanic

Contingency Plan

iv. GDC Utilities (Water & Waste) Emergency Management Plan (Draft)

Report Details

1.a.i GDC Risk Management - Stormwater Reticulation Author: Tim Crook, 19 May 1998

This report contains all the information in relation to Stormwater Reticulation that is

necessary for the executive management to determine what action, if any, should be taken in

respect of the risks and to provide information to personnel responsible for the subject matter at a

day to day or routine management level. They will also be used by the Risk Manager to monitor the

system and ensure its efficacy as far as circumstances permit. Sections include: Introduction, Scope

of Risk Assessment, Counter Measures, Question & Response Listing and Counter Measure

Triggers.

Note: See DOCS_n61277_v1_AMP_Risk_Management_Summary_-

_Counter_Measures_for_all_Utilities.xls for project recommendations.

1.b.i GDC Risk Management - Sewerage Reticulation Author: Tim Crook, 16 July 1998

This report contains all the information in relation to Sewerage Reticulation that is






Triggers.



1.b.ii GDC Risk Management - Sewerage Treatment & Disposal Author: Tim Crook, 16 Dec 1998

This report contains all the information in relation to Sewerage Treatment & Disposal that

is necessary for the executive management to determine what action, if any, should be taken in


../../61277/1/DOCS_n61277_v1_AMP_Risk_Management_Summary_-_Counter_Measures_for_all_Utilities.xls





n-49637 Page 127



of Risk Assessment, Scope Details, Risk Assessment, Counter Measures, Question & Response

Listing and Counter Measure Triggers.



1.b.iii GDC Human Health Risk Assessment for the Wastewater Outfall Author: EGIS Consulting ,

Sep 1999

This Risk Assessment evaluates the potential human health risks associated with sewage

effluent discharged into Poverty Bay, Gisborne. This assessment has focused on the risks to human

involved in primary contact recreation (ie. Swimmers, surfers) and shellfish harvesters who may be

exposed to microbiological contaminants present in the marine water and shellfish as a result of the

discharge of raw sewage into the Bay.

1.c.i GDC Risk Management - Water Supply Pipeline Author: Gordon Brock, 19 May 1998

This report contains all the information in relation to the Water Supply Pipeline that is






Triggers.



1.c.ii GDC Risk Management - Dams & Storage Reservoirs Author: Kristen McPherson, 28 Sep

1998

This report contains all the information in relation to the Dams and Storage Reservoirs that is









1.c.iii.1 Public Health Risk Management Plan – Gisborne Water Supply Author: Helen Churton, Feb

2008

The principle purpose of this Public Health Risk Management Plan (PHRMP) is to identify

potential events that present public health risks to the water supply system. Through this

identification, mitigation can occur and contingency plans can be put in place. Also, an improvement

plan to further isolate or eliminate the likeliness of this occurring is there for implementation, but

this is subject to future funding. Fields include: Identification of event, cause, preventative

measures, monitoring requirements and corrective actions.

Note: See DOCS_n61280_v1_PHRMP_Improvement_schedule_Gisborne_City_Water_Supply.pdf

for project recommendations.

1.c.iii.2 Public Health Risk Management Plan – Te Karaka Water Supply Author: Marlis Haertel,

Feb 2008









../../61280/1/DOCS_n61280_v1_PHRMP_Improvement_schedule_Gisborne_City_Water_Supply.pdf


n-49637 Page 128







1.c.iii.3 Public Health Risk Management Plan – Whatatutu Water Supply Author: Marlis Haertel,

Feb 2008









1.c.iv Volcano-Hydrologic Hazards in the Waipaoa Catchment Author: V Manville, July 2004

The Institute of Geological & Nuclear Sciences Ltd. (GNS) prepared a report identifying the

potential hazard from volcanic activity to the Waipaoa River catchment. Elements include:

A literature review of known volcanic impacts on the Waipaoa River,

A review of volcano-hydrologic hazards in river systems arising from eruptions of various

styles and magnitudes both globally and in NZ, with particular reference to downstream

aggradation, impacts on riparian engineering works, and chemical contamination,

An assessment of the vulnerability of the Waipaoa catchment to these hazards and a

ranking of the likelihood and seriousness of potential events, and

Recommendations for further study. (See below)

o Future research in determining the nature of hydrologic changes associated with

ashfalls of a given thickness and grain size.

o Develop a probalistic model of volcanic ash fall on the Gisborne District in order to

quantify the likelihood of hazardous levels of ash being deposited.

1.c.v GDC Emergency Management Response Plan for Bulk Water Pipeline Failure Author: Mike

Davidson, May 2008

The purpose of this plan is to provide an emergency response strategy to effectively

manage pipeline repairs or replacement and restore or maintain the service level and integrity of the

water supply to Gisborne City and rural customers. This plan applies to all emergencies where a Civil

Defence Emergency is NOT declared. Fields include: Identification of pipeline failure, pipeline

shutdown procedure, notification & response plan, communications & links, materials for

emergency and debriefing.

1.d.i GDC Risk Management – Plant & Motor Vehicles Author: Tim Crook, 7 Apr 1999

This report contains all the information in relation to the Plant and Motor Vehicles that is







1.d.ii GDC Risk Management – Staff & Industrial Relations Author: Kay Ligget, 16 Mar 1999

This report contains all the information in relation to the Staff and Industrial Relations that

is necessary for the executive management to determine what action, if any, should be taken in








n-49637 Page 129




1.d.iii Gisborne District Civil Defence & Emergency Services Volcanic Contingency Plan Author:

Unknown, Dec 2006

The purpose of this plan is to identify steps that the Emergency Management Team will use

to manage the lead up to and eruptive stages of a volcanic event. The recovery phase will be

managed with procedures contained in the Group Recovery Plan, except for the cleanup issue which

will have to be planned at the time.

To achieve this, the following factors are considered as the priorities for close co-

ordination.

Warning systems

Media/public information management

Essential services management, water/power/communications/fuel

Evacuations (evacuation plan)

Management of refugees – closure of Waioeka Gorge and SH 35

Logistics

1.d.iv GDC Emergency Management Plan – Water & Waste Author: Mike Davidson, Feb 2008

The purpose of this plan is to document an organisational structure and procedure

guidelines for dealing with an emergency event. This plan applies to all emergencies where a Civil

Defence Emergency is NOT declared. Sections include: Civil Defence – Responsibilities and

Structure, GDC Utilities Emergency Management Plan and Waingake Headworks Inspection Info.

Information Documents

Risk Information

Documents

Name Author Date Subject

Kaharoa Eruption

Hazards Workshop Environment B.O.P.

12 October

2003 A Regional Volcanic Contingency plan for a Kaharoa eruption.

National Civil Defence

Emergency Management

Strategy

Ministry of Civil Defence August 2003 Proposal for discussion

Guidelines for Action American Public Works

Association August 1998 Public works role in emergency management


Emergency Management Ministry of Civil Defence

December

2002 Directors guidelines for lifeline utilities


Emergency Management Ministry of Civil Defence

December

2002 Information for lifelines utilities

Lifelines Co-operation

Study for Water Supply Carson Group NZ

October

1998

Investigate developing a voluntary agreement between Water

authorities (nationally) for supplying assistance to another

authority who suffers major infrastructure damage from a natural

disaster

Civil Defence Report

97/5

Institute of Geological &

Nuclear Sciences report May 1997

The impact of recent falls of volcanic ash on public utilities in two

communities in the United States of America

Risk & Realities Canterbury University 1997 A multi-disciplinary approach to the vulnerability of lifelines to

natural hazards.


n-49637 Page 130

AMP Risk Management Summary

Report Name Author Date Company

GDC Risk Management - Stormwater Reticulation Tim Crook 19-May-98 GDC

GDC Risk Management - Sewerage Reticulation Tim Crook 16-Jul-98 GDC

GDC Risk Management - Sewerage Treatment & Disposal Tim Crook 16-Dec-98 GDC

GDC Human Health Risk Assessment for the Wastewater Outfall EGIS Consulting Sep-99 EGIS Consulting Australia

GDC Risk Management - Water Supply Pipeline Gordon Brock 19-May-98 GDC

GDC Risk Management - Dams & Storage Reservoirs Kristen

Mcpherson 28-Sep-98 GDC

Public Health Risk Management Plan – Gisborne Water Supply Helen Churton Feb-08 OPUS Consulting

Public Health Risk Management Plan – Te Karaka Water Supply Marlis Haertel Feb-08 None

Public Health Risk Management Plan – Whatatutu Water Supply Marlis Haertel Feb-08 None

Volcano-Hydrologic Hazards in the Waipaoa Catchment V Manville Jul-04 Institute of Geological & Nuclear Sciences Ltd

GDC Emergency Management Response Plan for Bulk Water

Pipeline Failure Mike Davidson 1-May-08 Quality System Consulting Services

GDC Risk Management – Plant & Motor Vehicles Tim Crook 7-Apr-99 GDC

GDC Risk Management – Staff & Industrial Relations Kay Ligget 16-Mar-99 GDC

Gisborne District Civil Defence & Emergency Services Volcanic

Contingency Plan Unknown Dec-06 GDC

GDC Emergency Management Plan – Water & Waste Mike Davidson Feb-08 Quality System Consulting Services


n-49637 Page 131

Appendix E – Asset Management Approach

HANSEN PROCEDUREDEVELOPERS WORKS

(GIFTED ASSETS)

DEVELOPERS

WORKS

PRACTICAL

COMPLETION

CERTIFICATE

ISSUED

AS BUILT

PLANS & DATA

RECEIVED

D/O ALLOCATE

DRAWING No.

FILE &

PRINT COPY

NEW ASSET ID’S

ALLOCATED TO

NEW ASSETS

ASSETS

ENTERED INTO

GIS LAYER

ASSETS LINKED

TO

HANSEN IMS

DATABASE

HANSEN

ATTRIBUTE

FIELDS

POPULATED

HANSEN

WORK ORDER

GENERATED

COPY

AS BUILT

PLAN

AS BUILT

PLAN

DATA

GIS PLAN &

WO’S COMPILED

END

START

Created 30/6/2006

Initiated 30/6/2006

Updated 1/8/2008

File Ref. VisioDocument


n-49637 Page 132

HANSEN PROCEDURE

CAPITAL WORKS(NEW ASSETS)

CAPITAL

WORKS

PRACTICAL

COMPLETION

CERTIFICATE

ISSUED

AS BUILT

PLANS & DATA

RECEIVED

D/O ALLOCATE

DRAWING No.

FILE &

PRINT COPY

NEW ASSET ID’S

ALLOCATED TO

NEW ASSETS

ASSETS

ENTERED INTO

GIS LAYER

ASSETS LINKED

TO

HANSEN IMS

DATABASE

HANSEN

ATTRIBUTE

FIELDS

POPULATED

HANSEN

WORK ORDER

GENERATED

COPY

AS BUILT

PLAN

AS BUILT

PLAN

DATA

GIS PLAN &

WO’S COMPILED

START

END

Created 30/6/2006

Initiated 30/6/2006

Updated 1/8/2008



n-49637 Page 133

HANSEN PROCEDUREMAINTENANCE WORKS

AS BUILT

PLANS & DATA

RECEIVED

NEW ASSET ID’S

ALLOCATED TO

NEW ASSETS

ASSETS

ENTERED INTO

GIS LAYER

ASSETS LINKED

TO

HANSEN IMS

DATABASE

HANSEN

ATTRIBUTE

FIELDS

POPULATED

HANSEN

WORK ORDER

GENERATED

GIS PLAN &

WO’S COMPILED

CONTRACTORS

INITIATED

WORKS

UTILITIES

INITIATED

WORKS

GENERATE

HANSEN

MAINTENANCE

WORK ORDER

GENERATE

HANSEN

MAINTENANCE

WORK ORDER

SIGN OFF

HANSEN WORK

ORDER ON

COMPLETION

WORKS

PRODUCE

MONTHLY

AS BUILT DETAIL

REPORT

NEW

OR EXISTING NEW

EXISTING

ANY GIS

CHANGES

UPDATE GIS

ASSET &

ATTRIBUTE

FIELDS

YES

ANY

HANSEN

CHANGESYES

UPDATE

HANSEN

ATTRIBUTE

FIELDS

NO

END

NO

STARTSTART

END

Created 30/6/2006

Initiated 30/6/2006

Updated 1/8/2008



n-49637 Page 134


n-49637 Page 135

HANSEN PROCEDUREHISTORICAL DATA & SPOT INSPECTIONS

AS BUILT

PLANS & DATA

RECEIVED

NEW ASSET ID’S

ALLOCATED TO

NEW ASSETS

ASSETS

ENTERED INTO

GIS LAYER

ASSETS LINKED

TO

HANSEN IMS

DATABASE

HANSEN

ATTRIBUTE

FIELDS

POPULATED

HANSEN

WORK ORDER

GENERATED

GIS PLAN &

WO’S COMPILED

START

NEW

OR EXISTING NEW

ANY GIS

CHANGES

EXISTING

UPDATE GIS

ASSET &

ATTRIBUTE

FIELDS

YES

ANY

HANSEN

CHANGES

UPDATE

HANSEN

ATTRIBUTE

FIELDS

YES

NO

END

NO

END

Created 30/6/2006

Initiated 30/6/2006

Updated 1/8/2008



n-49637 Page 136