Water Supply, Drainage and Flooding Wastewater …blog.innovyze.com/.../Day-1-1020-Wastewater-Planning-A-Consultants...Water Supply, Drainage and Flooding Wastewater Planning: Current

Water Supply, Drainage and Flooding

Wastewater Planning: Current State of Play and Looking to the Future – a Consultant’s Perspective

19th September 2012

David De Rosa, Clear Consultants

Wastewater ModellingEvolved over last 20 years….

Step changes in modelling software; WASSP; WALLRUS; SPIDA; HydroWorks; InfoWorks;

Dendritic → ‘full solution’ looped systems

User interface, GIS and data exchange

Hardware ↔ software constrained

Simplified models → all-sewer models

1-D → 2-D and integrated catchment models

InfoNet asset, survey and data management2

3

Wastewater Planning

Initially based on early versions of SRM

Used to understand asset base and develop schemes

Focus different across WCs

– Long term plans vs model development vehicle

Should have considered all issues, but

– Often focused on hydraulic issues

– Little forward looking operational planning

Criticisms?

– Snap shots / rapidly out of date

– Reports “sat on shelf”

– Too much focus on hydraulic performance / schemes and not enough planning

Evolved over last 20 years…..

4

DAPs – The Current State of Play

Step change to SRM5 & earlier Common Framework

Move to risk based assessments

– Focus expenditure on high priority areas

– Consider consequence of failures

Rolling and “live” to avoid ‘snap shot’ scenario

Linked to service measures, benefits and outcomes

More rounded plans across capital & operational

Medium and long term planning

Increased stakeholder engagement within and outside WCs

Significant change in last 3 years…..

Urban Drainage Challenges

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Longbridge STW

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Milverton

Radford SemeleCastles Park

River Leam

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River Leam


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Sherborne BrookSherborne BrookSherborne BrookSherborne BrookSherborne BrookSherborne BrookSherborne BrookSherborne BrookSherborne Brook

Longbridge Brook

Longbridge Brook

Longbridge Brook

Longbridge Brook

Longbridge Brook

Longbridge Brook

Longbridge Brook

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Grand Union CanalGrand Union CanalGrand Union CanalGrand Union CanalGrand Union CanalGrand Union CanalGrand Union CanalGrand Union CanalGrand Union Canal

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Lillington

Sydenham

Woodloes Park

Hampton Magna

1km

Climate Change

Urban Creep

Growth and New

Development

Surface Water

Flooding

PollutionCSOs & WwTW

Combined Sewer

Flooding

Ageing Infrastructure

Interactions with other

urban stakeholders

Carbon

Resilience

EfficiencyOpex v Capex

Long term strategic plans

Hydraulic Modelling

Tactical operational support

Improvement

Benefits

Value for money

Climate Change

6

SOURCE: UKCIP09 Climate Change Projections

UKCIP09 Climate Projections

Wetter winters & drier summers

More short, intense events causing flooding

Population Growth

7

Population growth of 10m in 25 years SOURCE: www.ons.gov.uk

Urban Creep

8

Front gardens – paved for driveways

Back gardens – conservatories & extensions

Wrong connections

Average approx 1m2 / house / year

– Housing type

– Property density

– Socio-economic groups

Relaxation of Planning Regulations

Ageing Infrastructure

9

70% of sewers across UK are 50 years old or more

Increasing risk of asset deterioration into future

20% 100yrs old

Poor condition

50% pre-war

Capital Maintenance - linked to serviceabilityUnderstand likely collapse, blockage and failure hotspots

Attempt to understand frequency and consequence

Root cause analysis

Deterioration modelling

Low velocity assessments

Failure model analysis

Consequence analysis

Response time assessment

Prioritisation

Drive operational maintenance regimes

10Identify highest risk operational collapse or blockage

and promote within a pro-active programme

Where are we likely to go…

Include Private Sewers to improve asset base understanding and performance and risks – full serviceability ‘all sewer’ models

Type III models in high hydraulic risk areas to give further efficiencies in capital programme

Water Quality modelling to ensure objectives and obligations of WFD are understood and met in the future and pro-actively manage risks in response to growth, climate change and creep

Increase in Integrated Models to understand multi-agency problems, such as flooding

11

12

Surface Water Management Plans

Integration with SWMPsOpportunity to get on front foot with: • model upgrades• Understanding of responsibilities• Pro-active modelling?Inclusion of more SW sewers and 2D modellingIdentify and influence long term stakeholder engagement needsInfluence development planning

Risk based outputs aligned to SWMPs initiatives

13

Sustainable Solutions

Sustainable mitigation initiatives

Surface Water Reduction & SuDSIdentify opportunities for SW reduction or removalUse models to test SW reduction on strategic and local scalesPossible solutions to existing problemsCreate system capacity and headroomDemand management to reduce capital investmentEnergy and carbon benefitsLong term strategy to mitigate climate change, growth and creep

14

Real-Time Monitoring

Permanent / long term monitors to record system performance

On-going model calibration

Manage and utilise headroom

Identify operational issues; as blockages; pump failures

Move from ‘set pro-active’ to ‘just in time pro-active’

Use DAP knowledge to identify optimum locations for strategic long term monitors & operational improvement monitoring sites

DAP models and scenario tests can be used to formulate alarm and response strategies for monitors

Live DAPs lend themselves to driving ownership and implementation of long term monitoring programmes

Predictive Modelling

Real time flow management in response to predicted rainfall events

Prediction of flooding, surcharge and CSO spills

Prediction of bathing water failures

Pre-emptive interventions

15

Back to the Future?

Now doing what the SRM set out to achieve

Long term planning

Asset management

Joined-up – hydraulic, operational, structural, water quality

16

Water Supply, Drainage and Flooding

Wastewater Planning: Current State of Play and Looking to the Future – a Consultant’s Perspective

19th September 2012

David De Rosa, Clear Consultants

Documents

Water Supply, Drainage and Flooding Wastewater …blog.innovyze.com/.../Day-1-1020-Wastewater-Planning-A-Consultants...Water Supply, Drainage and Flooding Wastewater Planning: Current