3. Water Conservation - Somaiya

© Confederation of Indian Industry

WATER CONSERVATION


The World’s Water

70% of Earth’s surface is covered with water


Saltw ater97.5%

Freshw ater2.5%

Total Surface Freshwater : 0.4%

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Where is the freshwater?

World’s Freshwater

World’s Water

Groundwater30.1%

Surfacewater0.4%

Glaciers69.5%

Salt Water97.5%

Fresh Water2.5%


Water Consumption Pattern in a Typical Air-conditioned Building

Landscaping

Flushing

Air-conditioning Make-up

25-30%

25-30%

50-60%


Approach

� Reduce

� Recycle/ Reuse

� Recharge


Water Conservation

Credit Title Points

WC Mandatory Requirement 1

Rainwater Harvesting,

Roof & Non-roofRequired


Water Efficient Plumbing Fixtures Required

WC Credit 1 Landscape Design 2

WC Credit 2 Management of Irrigation Systems 1

WC Credit 3Rainwater Harvesting,

Roof & Non-roof4

WC Credit 4 Water Efficient Plumbing Fixtures 5

WC Credit 5 Wastewater Treatment and Reuse 5

WC Credit 6 Water Metering 1

Total 18



Rainwater Harvesting, Roof & Non-roof

� Intent

� Enhance ground water table and reduce

municipal water demand

� Through effective rainwater management

� Compliance Option

� Design rainwater harvesting system to

capture at least ‘One-day Rainfall’ runoff

volume from roof & non-roof areas


Criteria to arrive at ‘One-day Rainfall’

S.No.Average Peak Month

Rainfall in mm

“One-day Rainfall”(% of Average Peak

Month Rainfall)

1 Upto 250 9%

2 251 – 350 7.5%

3 351 – 500 6%

4 501 – 700 4.5%

5 701 & above 3%

Lower the rainfall – Higher the harvesting volume

Higher the rainfall – Lower the harvesting volume


Runoff Coefficients for Typical Surface Types

Surface type Runoff Coefficient

Cemented / Tiled Roof 0.95

Roof Garden 0.5 – 0.1

Turf, Flat-to-steep 0.25 – 0.45

Mixed Vegetation, Flat-to-Steep 0.1 – 0.3

Concrete Pavement 0.95

Gravel Pavement 0.75

Open-grid Grass Pavement 0.5

Water Bodies (lined) Eg: Swimming pool 0.95

Water Bodies (un-lined) Eg: Harvesting pond 0

Runoff volume = Surface area x Runoff Coefficient x Rainfall



� Rainwater harvesting is exempted in areas

where:

� The Central/ State Ground Water Board does

not recommend artificial rain water recharge

(Or)

� The groundwater table is less than 8 meters

Applicable for Mandatory Requirement only


Rainwater Harvesting Pit with Filtration


Rainwater Harvesting Pond

Turbo Energy, Chennai Platinum Rated



Water Efficient Plumbing Fixtures

� Intent

� Enhance efficiency of plumbing fixtures,

thereby minimising potable water use

Flow fixturesFlush fixture




� Compliance Option

� Use water efficient plumbing fixtures

� Flow rates to meet the baseline criteria

in aggregate

Notes:

• Treated waste water/ captured rain water should NOT be considered

for calculations

• Use of treated waste water is addressed in ‘Waste Water Treatment

and Reuse’


Baseline Flow Rates / Consumption

Fixture TypeMaximum Flow

Rate/Consumption

DurationEstimated Daily Uses

per FTE

Water Closets

(Full-flush)6 LPF 1 flush

1 for male;

1 for female

Water Closets

(Half-flush)3 LPF 1 flush 2 for female

Urinals 4 LPF 1 flush 2 for male

Faucets / Taps* 6 LPM 15 seconds 4

Health Faucet* 6 LPM 15 seconds 1

Showerhead /

Handheld Spray*10 LPM 8 Minutes 0.1

* Reporting pressure for these fixtures shall be at 3 bar.


Full Time Equivalent (FTE)

� FTE represents a regular building

occupant who spends 8 hours/ day

in the building

� Part-time or overtime occupants have

FTE values based on their hours per day

1 FTE = 8 hours / day


Flow Fixtures Fitted with Aerators

Aerators - Small in size, Big in Impact


Aerator Demo


Waterless Urinal


Waterless Urinal

Key Valve


WC Credit 1

Landscape Design� Intent

� Design landscape to ensure minimum

water consumption

Infosys Pocharam, Hyderabad


WC Credit 1

Landscape Design

� Compliance Options:

� Limit use of turf to conserve water

� Design landscaped area with:

� Drought tolerant

� Native

� Adaptive species

Xeriscaping Native Species


Azadirakta Indica Pinus

Cactus Family

Palm Family

NativeDrought Tolerant

Adaptive

Landscape Design


Points Distribution

Type of Landscape Percentage Points

Turf Area < 30% 1

Drought Tolerant / Native /

Adaptive Species Area> 30% 1


Vegetation on Roof

IDBI, Mumbai

Kalpataru Square, MumbaiPlatinum Rated


WC Credit 2

Management of Irrigation Systems

� Intent

� Reduce water demand for irrigation

� Through water efficient management systems

and techniques

Moisture SensorSprinklers for Landscaping Drip Irrigation


Management of Irrigation Systems

� Compliance Options: (1 point)

� Provide/ install highly efficient irrigation systems (minimum four features)

� Central shut-off valve

� Soil moisture sensors

� Segregate landscape areas, based on watering needs

� Drip irrigation system, to reduce evaporation

� Timer based controls

� Pressure regulating devices

� Any other innovative methods for watering


WC Credit 3


� Intent

� Enhance ground water table and reduce

municipal water demand

� Through effective rainwater management

� Compliance Option (2-4 points)

� Case A: Design rainwater harvesting system to

capture at least ‘One-day rainfall’ runoff volume

from roof and non-roof areas


WC Credit 3


S No

Average Peak Month Rainfall

(mm)

One-day Rainfall

(% of Average Peak Month Rainfall)

2 points 3 points 4 points

1 Upto 250 12% 15% 18%

2 251 – 350 10% 12.5% 15%

3 351 – 500 8% 10% 12%

4 501 – 700 6% 7.5% 9%

5 701 & above 4% 5% 6%

Lower the rainfall – Higher the harvesting volume

Higher the rainfall – Lower the harvesting volume


WC Credit 3


� Compliance Options

� Case B High Ground Water Table: Design rainwater harvesting system to capture at least ‘One-day rainfall’ runoff volume from roof and non-roof areas

S No

Average Peak Month

Rainfall

(mm)

One-day Rainfall

(% of Average Peak Month Rainfall)

2 points 3 points 4 points Exemplary

1 Upto 250 6% 9% 12% 15%

2 251 – 350 15% 7.5% 10% 12.5%

3 351 – 500 4% 6% 8% 10%

4 501 – 700 3% 4.5% 6% 7.5%

5 701 & above 2% 3% 4% 5%


WC Credit 4


� Intent

� Enhance efficiency of plumbing fixtures

thereby minimising potable water use


WC Credit 4


� Compliance Option:

� Use water efficient plumbing fixtures

with flow rates less than 8% of the

baseline criteria

Notes:

• Treated waste water/ captured rain water should NOT be

considered for calculations

• Use of treated waste water is addressed in ‘Waste Water

Treatment and Reuse’


Baseline Flow Rates / Consumption

Fixture Type Maximum Flow Rate/

Consumption

Duration Estimated Daily Uses

per FTE

Water Closets

(Full-flush)6 LPF 1 flush

1 for male;

1 for female

Water Closets

(Half-flush)3 LPF 1 flush 2 for female

Urinals 4 LPF 1 flush 2 for male

Faucets / Taps* 6 LPM 15 seconds 4

Health Faucet* 6 LPM 15 seconds 1

Showerhead /

Handheld Spray*10 LPM 8 Minutes 0.1

* Reporting pressure for these fixtures shall be at 3 bar.


Points Distribution

Water Efficient Plumbing Fixtures(Individually or in aggregate)

Points

8% less than baseline criteria 1






WC Credit 5

Waste Water Treatment and Reuse

� Intent

� Treat waste water generated on-site

� To avoid polluting the receiving streams

by safe disposal

� Use treated waste water

� To reduce dependence on potable water


Waste Water Treatment and Reuse


� Waste Water Treatment (2 Points)

(And / Or)

� Waste Water Reuse (3 Points)


Waste Water Treatment

� Install on-site treatment system to

handle 100% of waste water

generated in the building

� Quality standards should comply with

CPCB/State Pollution Control Board norms


On-site STP

Eicher Good Earth, GurgaonPlatinum Rated


Phytoremediation

CII- Sohrabji Godrej Green Business CentrePlatinum Rated


Waste Water Before & After Treatment

L’oreal India Pvt. Ltd., PuneGold Rated


Waste Water Reuse

� Use treated waste water for:

� Landscaping

� Flushing

� Cooling tower make-up water

ApplicationPercentage of Total Water catered through Treated

Waste Water

Landscaping, Flushingand Air-conditioning make-up

≥ 25%

≥ 50%

≥ 75%


WC Credit 6

Water Metering

� Intent

� Encourage sub-metering to improve water

performance of the building, and save

potable water

Water meter for

Gardening


WC Credit 6

Water Metering


� Building-level Metering

(For Owner-occupied & Tenant-occupied buildings)

� Tenant-level Metering

(For Tenant-occupied buildings)


Building-level Metering (Install atleast three water meters)

� Municipal water supply

� Bore water consumption

� Treated waste water consumption

� Water consumption for landscaping

� Water consumption for flushing

� Water consumption for air-conditioning cooling tower makeup

� Any other major source of water consumption


Tenant-level Metering

� Municipal water supply/ Water consumption

through bore-well (Potable water)

� Water consumption for flushing

(Non-potable water)

Water Meters


Water Conservation

Credit Title Points


Rainwater Harvesting,

Roof & Non-roofRequired


Water Efficient Plumbing Fixtures Required

WC Credit 1 Landscape Design 2

WC Credit 2 Management of Irrigation Systems 1

WC Credit 3Rainwater Harvesting,

Roof & Non-roof4

WC Credit 4 Water Efficient Plumbing Fixtures 5

WC Credit 5 Wastewater Treatment and Reuse 5

WC Credit 6 Water Metering 1

Total 18


Every drop counts …

3. Water Conservation - Somaiya

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