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Water Efficient Buildings Wong Wai Cheng Manager (Water Demand Management). Water Consumption in S’pore. Total water consumption 58 % for domestic consumption 42 % for non domestic consumption. Why Conserve Water……. Reduce Operation Cost Contribute to National effort to Conserve Water .

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Water Efficient Buildings

Wong Wai Cheng

Manager (Water Demand Management)


Water Consumption in S’pore

  • Total water consumption

    • 58 % for domestic consumption

    • 42 % for non domestic consumption


Why Conserve Water……

  • Reduce Operation Cost

  • Contribute to National effort to Conserve Water


Pricing

Voluntary

Reflect the strategic importance and scarcity value of water

3P approach

Promote ownership of water conservation

Water Conservation Strategy

Mandatory

Cut down on excessive flow and wastage of water


Water tariff structure

W.e.f. 1 July 2000

Consumption

block

(m3 per mth)

Tariff

category

Tariff

(¢/m3)

WCT

(%)

Domestic

1 to 40

117

30

Above 40

140

45

30

Non-domestic

All units

117

Pricing

Water Tariff Structure

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


Mandatory

9 litre flushing cistern

4.5 litre flushing cistern

Mandatory

Installation of Water Saving Devices

Since 1983

  • Self-Closing Delayed-Action Taps

    (non domestic premises including common amenities of condominiums)

  • Constant Flow Regulators

    (all premises)

    Since 1997

  • Low Capacity Flushing Cistern


Reduction of max allowable flow rates

Mandatory

Reduction of Max Allowable Flow-rates


Voluntary

Water Efficient Buildings (WEB)

Encourage building owner / management agent to take ownership

  • Reviewwater usage pattern/habits

  • Reducewater usage, keep to efficient flow rates/flush volume. Recycle/reuse wherepossible

  • Repair leaking fittings promptly to avoid water wastage

  • More than 900 buildings/premises certified as WEB


Website Portal

Water Volunteer Groups (WVGs)

Mandatory Installation of Dual Flush LCFCs

The 10-Litre Challenge

Water Efficiency Labeling Scheme



WATER EFFICIENCY LABELLING SCHEME(WELS)

  • A voluntary labelling scheme dedicated to promoting Water Efficient Products

  • Launched on 31st Oct 2006

  • Jointly administered by the Singapore Environment Council (SEC) & PUB


WATER EFFICIENCY LABELLING SCHEME(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


WATER EFFICIENCY LABELLING SCHEME(WELS)

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.


Water efficiency labelling scheme

  

Excellent

 

Very Good

Good

Water Efficiency Labelling Scheme

Products

3-tier Rating System

Shower Head

Dual Flush Cistern

Washing Machine

Basin/ Sink Tap


Criteria For Water Efficiency Labelling Scheme (WELS)

  • To pass laboratory simulation test on waste transportation efficiency in pipe.

  • To pass dilution test


Wels website www sec org sg wels
WELS WEBSITE www.sec.org.sg/wels.


Incorporate water efficient labelled products in buildings
INCORPORATE WATER EFFICIENT LABELLED PRODUCTS IN BUILDINGS

  • WELS is incorporated under BCA’s Green Mark criteria for new buildings – air con and residential buildings.

  • BCA’s 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


Green mark for air con buildings water efficiency criteria

Green Mark for Air Con Buildings- Water Efficiency Criteria


Green mark for residential buildings water efficiency criteria

Green Mark for Residential Buildings- Water Efficiency Criteria


Water Efficient Building Design

  • Submetering

  • Installation of Pressure Reducing Valves

  • Install Water Saving Devices/ use of Water Efficient Labelled Products

  • Water Substitution / Recycling of used water

  • Water Efficient Landscaping


(1) Submetering

  • 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


Water Tank

m

Residential

Units

m

Sub meters

m

Irrigation

Swimming Pool

m

Water Tank

Bulk Meter

Public Toilets

m

m



  • 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


(2) Pressure Reducing Valves management system (BMS)

Install Pressure reducing valves at every floor to maintain the water pressure of the water supply to every dwelling unit at 1.5 bar


Water Tank management system (BMS)

Pressure Reducing Valve

Bulk Meter

m


(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


(4) Water Substitution/Recycling products

  • Encourage substitution with NEWater for non potable use eg. Air con cooling towers, process use, etc.

  • Encourage recycling of process water or used water

  • Cheaper


Water Substitution (NEWater) products

Seletar

5 mgd

2004

Kranji

9 mgd

Jan 2003

Ulu Pandan

25 mgd

Early 2007

Bedok

6 mgd

Jan 2003

Legend

NEWater pipeline

NEWater Plant

Service Reservoir


(5)Water Efficient Landscaping products

  • Water Efficient Plants

  • - Use drought resistant plants or plants that fit naturally into 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.

Draught resistant plants

Limit turf Area


  • Water Efficient Irrigation Systems products

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

  • - Drip irrigation applies water slowly and directly to the roots of 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


Rainwater Collection products

  • non-potable usage (irrigation, washing, toilet flushing, etc)

16 Mar 2004


Thank You products


Urinals products

  • recommended flush volume for standard size urinal (300mm width) is 0.5 litres per 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
Shower Taps & Low Flow Showerheads products

  • The flow rate should not exceed 7 litre/min

  • Install Low Flow Showerheads with less than 5 litre/min

< 5 L/min


Washbasin Taps products

After insallation of thimble (3.8 L/min)

Before insallation of thimble or CFR

2 l/min (Laminar)

6 l/min (Turbulence)

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.


Cistern water saving bag for 9 litre flushing cistern
Cistern Water Saving Bag for 9 litre Flushing cistern products

Dual Flush Low Capacity Flushing Cistern




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