Water Efficient Buildings

7/27/2019 Water Efficient Buildings

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Water Efficient Buildings

Wong Wai ChengManager (Water Demand Management)


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Total water consumption

58 % for domestic consumption

42 % for non domestic consumption

Water Consumption in Spore


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Why Conserve Water

Reduce Operation Cost

Contribute to National effort to Conserve Water


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WaterConservation

Strategy

PricingReflect the strategic

importance and scarcityvalue of water

Voluntary3P approachPromote ownership of

water conservation

MandatoryCut down on excessiveflow and wastage of water


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Water Tariff Structure

WCT : Water Conservation Tax - Broad-based Tax levied by the Government

Tariff

category

Domestic

Non-domestic

Consumption

block

(m3 per mth)

W.e.f. 1 July 2000

Tariff

(/m3)

WCT

(%)

1 to 40

Above 40

All units 117

140

117 30

45

30

Pricing


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Mandatory

Since 1983

Self-Closing Delayed-ActionTaps

(non domestic premises including

common amenities ofcondominiums)

Constant Flow Regulators

(all premises)

Since 1997Low Capacity Flushing Cistern

9 litre flushing cistern 4.5 litre flushing cistern

Installation of Water Saving Devices


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Reduction of Max Allowable Flow-rates

Area of Usage

Maximum Allowable

Flowrate

(litres/min)

Water Efficient Flow

Rate

(litres/min)

Remarks

New

Basin Tap & Self

Closing Delayed

Action Basin Tap

62 (toilets)

4 (others)

For self closing

delayed action basin

taps, timing shall

remain at between 2

and 3 sec

Sink / Kitchen Tap and

Wash Area8 6

Shower Tap & Self-

Closing DelayedAction Shower Tap

9*

12 (hotels)7

For self closing

delayed action

shower tap, timingshall remain at

between 13 and 15

sec

Other Areas 8 6

Mandatory


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Voluntary

Water Efficient Buildings (WEB)

Reviewwater usage pattern/habits

Reducewater usage, keep to efficientflow rates/flush volume. Recycle/reusewherepossible

Repair leaking fittings promptly to avoidwater wastage

More than 900 buildings/premisescertified as WEB

Encourage building owner / managementagent to take ownership


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Website PortalWater Volunteer

Groups (WVGs)

Mandatory

Installation of

Dual Flush

LCFCs

WaterEfficiency

Labeling

Scheme


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Water Efficiency Labelling Scheme

(WELS)


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WATER EFFICIENCY LABELLING SCHEME

(WELS)

A voluntary labelling scheme dedicatedto promoting Water Efficient Products

Jointly administered by the Singapore

Environment Council (SEC) & PUB

Launched on 31st Oct 2006


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(WELS)

Objectives Facilitate consumer to make informed choice

when purchasing products

Increase public awareness on water conservation

Encourage manufacturers/importers to bring in

more water efficient products

Promote water efficient building design


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The Water Efficiency Label comprises:

the title Water Efficiency

ticks that indicate water efficiency of the labelled products (the

more ticks, the more water efficient is the product)

the water efficiency rating in words:

Good (for products with 1 tick)Very Good (for products with 2 ticks)

Excellent (for products with 3 ticks)

Water Consumption

Type of Product Brand

Model

Serial No.


(WELS)


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Water Efficiency Labelling Scheme

Products

Shower Head Dual Flush Cistern

Washing Machine Basin/ Sink Tap

3-tier Rating System

Excellent

Very Good

Good


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Criteria For Water Efficiency Labelling Scheme (WELS)

FITTINGS MAXIMUM ALLOWABLE GOOD

RATING

VERY GOOD

RATING

EXCELLENT

RATING

Shower Taps, Mixers &

Showerheads

(L/min)

9 >7 to 9 >5 to 7 5 or less

Basin Taps & Mixers

(L/min)6 >4 to 6 >2 to 4 2 or less

Sink/Bib Taps (L/min) 8 >6 to 8 >4 to 6 4 or less

Flushing Cisterns Dual

Flush Type (L/flush)

4.5 (full flush)

3.0 (low flush)

>4.0 - 4.5

(full flush)

> 2.5 -3.0

(low flush)

>3.5 to 4.0

(full flush)

> 2.5 3.0

(low flush)

3.5 or less (1)

(full flush)

2.5 or less

(low flush)

Urinals & Urinal Flush

Valve

(L/flush)

1.5 > 1.0 to 1.5 > 0.5 to 1.0

0.5 or less (2)

Or waterless

urinals

Washing Machine

(L/Kg)15 > 12 -15 > 9 -12 9 or less

(1) To pass laboratory simulation test on waste transportation efficiency in pipe.

(2) To pass dilution test

WELS WEBSITE


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WELS WEBSITE

www.sec.org.sg/wels.

INCORPORATE WATER EFFICIENT
http://www.sec.org.sg/welshttp://www.sec.org.sg/wels


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INCORPORATE WATER EFFICIENTLABELLED PRODUCTS IN BUILDINGS

WELS is incorporated under BCAs Green Mark criteria for

new buildings air con and residential buildings. BCAs Green Mark for Schools will be announced soon

Encourage developers, govt agencies as well as professionals

to incorporate this scheme in their developments/buildings

design specification


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Green Mark for Air Con Buildings

- Water Efficiency Criteria


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Green Mark for Residential Buildings

- Water Efficiency Criteria


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Water Efficient Building Design

(1) Submetering

(2) Installation of Pressure Reducing Valves

(3) Install Water Saving Devices/ use of Water

Efficient Labelled Products

(4) Water Substitution / Recycling of used water

(5) Water Efficient Landscaping


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Monitor water usage - Key element

Sub-meters should be installed

Installation of submeters/private meters on all

major water systems, such as cooling tower,

irrigation, hot water devices, etc.\

Know how water is used

Identification of leak areas quickly

Shall be accessible for meter

readings and maintenance

(1) Submetering


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Residential

Units

Irrigation

Swimming

Pool

Public Toilets

Water Tank

m

m

m

m

Sub

meters

Bulk Meter

Water Tank

m

m


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Maintenance officers are encouraged to take

water meter readings regularly

(daily/weekly/fortnightly) Monitor the water consumption on a plotted

graph

Any sudden increase may indicate a leak in the

system Investigate immediately

Take prompt action to repair leaks, if any


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main and sub-meters should be linked to a building

management system (BMS)

water usage trends can be recorded

Alarm activated if there is a sudden increase in water

consumption or a new trend in water consumption as

this will indicate the possibility of a water leakage


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(2) Pressure Reducing Valves

Install Pressure reducing valves at every floor to

maintain the water pressure of the water supply to

every dwelling unit at 1.5 bar


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(3) Water Saving Devices/ Use of Water

Efficient Labelled products

- Use Water Efficient Labelled products

with Excellent rating

- Install water saving devices

Basin Taps : thimbles or CFRs

Flushing cistern : use dual flush low capacity

flushing cistern

: cistern water saving bags for

9 litre flushing cistern

Urinals : reduce flush volumes or use waterless urinals

Low Flow Showerheads


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Encourage substitution with

NEWater for non potable use eg.Air con cooling towers, process

use, etc.

Encourage recycling of processwater or used water

Cheaper

(4) Water Substitution/Recycling

Water Substitution (NEWater)


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Water Substitution (NEWater)

Seletar5 mgd

2004

Kranji9 mgd

Jan 2003

Bedok6 mgd

Jan 2003

NEWater pipeline

NEWater Plant

Service Reservoir

Legend

Ulu Pandan

25 mgdEarly 2007


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Water Efficient Plants

- Use drought resistant plants or plants that fit naturallyinto the existing climatic conditions

- Limit amount of turf area , turf grasses need a lot of water

and require continual upkeep

- Group plants by their water needs such as plants that

need high, moderate or little to no irrigation.

(5)Water Efficient Landscaping

Draught resistant plants Limit turf Area


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Water Efficient Irrigation Systems

-Drip irrigation uses 30% to 50% less water than sprinkler

irrigation

- Drip irrigation applies water slowly and directly to the rootsof plants. Hence, evaporation and runoff is minimized

- Adopt flexible irrigation schedule to save water by adjusting

to changing weather conditions

- Recycled water should be used- Potable water is only permitted for system to be turned on

manually and turned off automatically


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Rainwater Collection

16 Mar 2004

non-potable usage

(irrigation, washing, toiletflushing, etc)


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Thank You


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Urinals

recommended flush volume for standard

size urinal (300mm width) is 0.5 litresper flush

Waterless Urinals :

Eliminate the use of water in flushing- save water

Low installation cost as water connection

and flush valve are not needed

Proper maintenance is crucial to ensure

the waterless urinal do not cause

unpleasant smells.

Shower Taps & Low Flow Showerheads


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Shower Taps & Low Flow Showerheads

< 5 L/min

The flow rate should not exceed 7 litre/min

Install Low Flow Showerheads with less than 5 litre/min

Washbasin Taps


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Washbasin Taps

6 l/min

(Turbulence)

2 l/min

(Laminar)2 l/min with Thimble

(Spray)

Or

2 l/min CFR

For sensor taps with 2 litre/min flow rate, cut

off supply when hand is removed from basin or

preset timing of not more than 60 secs is

reached,whichever is earlier.

Before insallation of

thimble or CFRAfter insallation of

thimble (3.8 L/min)


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Cistern Water Saving Bag for9 litre Flushing cistern

Dual Flush Low Capacity

Flushing Cistern


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Take Water Meter Readings Regularly

2005 Monthly Water


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500

600

700

800

900

1000

1100

1200

JAN FEB M AR APR M AY JUN JUL AUG SEP OCT NOV DEC

Months (2005)

Consumption(m3)

2005 Monthly Water

Consumption

Documents

Water Efficient Buildings