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Water Efficiency in
Built Environment
•Jit Kumar Gupta
Water in the
Global Context
WATER – GLOBAL CONTEXT
 80% of earth covered in water,
 only 2% water fresh-- fit for drinking
 1.6% of freshwater-- in glaciers/ polar ice caps.
 2.4 billion people living- without access to improved sanitation
facilities
 nearly 700 million people-- not receiving their drinking-water from
improved water sources,
 global water demand increasing @ 1% per year – due to
 --population growth
 --economic development
 -- changing consumption patterns,
 -- Water consumption - continue to grow over next two decades
 --- 3.6 billion people ( half global population) live in area-potentially
water-scarce at least one month per year
 -- this figure may go to 4.8–5.7 billion by 2050
WATER AS A RESOURCE
 Clean/ Safe water –Most valuable & scarce resource
 Water - Elixir of life
 Water- Promoter of Physical Development
 Water-- Promoter of Economic development
 Water – Critical for Sustainable Development
 Water- Critical for Human Health
 Water - Critical for social development.
 Water- Generator of Employment-Three out of four jobs worldwide--
water-dependent.
 Water- Sustainer of Human Living in terms of;
 - food,
 - energy,
 - transportation
 - business,
 - nature,
 - leisure,
 - identity,
 - culture and
 social norms
.
WATER IN THE ECONOMIC CONTEXT
 UN World Water Report-2016 -- globally 3.2 billion people
dependent upon access to water/water-related services
 Water shortages/ lack of access --may limit future economic
growth
 Water stress can—
 -- Create security challenges,
 -- force migration
 -- undo progress
 - promote poverty.
 Water scarcity -- major concern- due to pressures exerted
on water sources;
 climatic change-- to further intensify crisis.
 Managing ever-increasing water demand -- single greatest
development challenge – nations/communities facing in 21st
century
Water in the
Indian Context
WATER – INDIAN CONTEXT
 India highly land stressed
 India highly water stressed
 India holds just 4% of world's fresh water-0.016%
 16% of global population.
 Half of India's water supply in rural areas--contaminated
with toxic bacteria.
 Every year, India loses 600,000 children-- due to illnesses
associated with unclean drinking water.
 As per World Bank – :
 163 Million Indians- lack access to safe drinking water
 210 Million Indians- lack access to improved sanitation
 21% of communicable diseases linked to unsafe water
 500 children under the age of five die from diarrhoea each
day in India
WATER CRISIS IN INDIA
 --Water scarcity issues not new to India
 --. Per capita water availability less than 1,700 cubic metre
considered water stressed
 -- India has 1,545 cubic metre
 -. Water resources ministry predicts- water availability could
plunge to;
 -- 1,341 cubic metres in 2025
 -- as low as 1,140 by 2050.
 -- Different states hit by severe drought impacting people,
agriculture, livestock etc.
 - South India-- Karnataka, Tamil Nadu, Andhra Pradesh and
Telangana have been victims of severe water crisis.
WATER CONSUMPTION
WATER CONSUMPTION
 Critical issue of water consumption – demand on supplying
aquifer/sources exceeding its ability to replenish itself
Key drivers of water demand / consumption:
--Rapid growth of population
--Increased Urbanization
Increased per capita income
 high consumption life style
-Industrialization
-- Water intensive fixtures
--Water intensive agriculture crop
--Large Misuse /wastage of water
- Poor water management
Managing
Water in Built
Environment
Approach to
Water
Management
WATER MANAGEMENT-- KEY OBJECTS
Protect water
Conserve water
Protect water quality
 Reduce consumption
Find Alternate Sources
Make addition to water sources
WATER MANAGEMENT STRATEGIES
a) Use integrated process to assess:
 -- existing water resources,
 -- opportunities for reducing water demand, and
-- alternative water supplies.
b) Promoting Green building to encourages :
 -innovative water-saving strategies
 --that help projects use water wisely.
c) Promoting effective water strategies include:
 Installing efficient plumbing fixtures.
 Use dual plumbing
 Using non-potable water.
 Installing -meters.
 Choosing locally adapted plants.
 Using Xeri-scaping. --a landscaping method developed especially for arid/semi-arid
climates that utilizes water-conserving techniques -- use of drought-tolerant plants,
mulch, and efficient irrigation
APPROACH TO WATER MANAGEMENT
: Principles for Managing water
 -- Make buildings water efficient over entire life-cycle- embodied
and operational use of water
-- Promoting Slow the flow of water
•-- Promoting Economical and optimal use of water
•-- Minimising wastage
•-- Minimising leakage
•--Promoting Multiple Usage (reuse and recycling)
 -- Using water efficient fixtures
 -- Using native plants and trees
 -Using low water embodied materials- Using materials requiring
less water in making and using
 -- Using low water construction technologies
 - Using water efficient landscape- Using native trees/plants
 -- Mulching trees/- plants to retain moisture, prevent evaporation
 - Using alternate sources of water-- Rainwater water harvesting
Optimization of
water demand
Use of water
efficient systems
Use of recycled
water and
rainwater
harvesting
SomecostimpactHighestcost
impact
Leastcostimpact
COST EFFECTIVE STRATEGY FOR WATER EFFICIENCY
Water
Management in
Green
Buildings
SALIENT WATER FEATURES IN GREEN BUILDINGS

• Minimum water discharge
• 100 % wastewater recycling
• Rain water harvesting
• Water efficient landscaping
• High efficient water fittings
• Water efficiency in A/C systems
• Innovative waste water technology
• Reduction of potable water use
SALIENT WATER FEATURES IN GREEN BUILDINGS

-- Mandatory Requirement
--- Rainwater Harvesting, Roof & Non-roof
--Water Efficient Plumbing Fixtures
Credit 1 Landscape Design
Credit 2 Management of Irrigation Systems
Credit 3 Rainwater Harvesting, Roof & Non-roof
Credit 4 Water Efficient Plumbing Fixtures
Credit 5 Waste Water Treatment and Reuse
Credit 6 Water Metering
WATER EFFICIENCY THROUGH BUILDING DESIGN
 i. Recognize environmentally preferable design --for site/ storm water
management
 Design buildings - respecting existing natural flows / features of land,
 Strategically locate buildings- to preserve key natural hydrological
features.
 Preserving areas of site- that serve as natural storm water retention /
ground water infiltration / recharge systems.
 ii. Preserve existing mature vegetation-- absorbing/ disbursing up to 30%
of a site’s rainwater
 iii Minimize building’s footprint—
 iv minimize excavation/soil disturbance
 --minimise compaction of existing topsoil
 -- soil in natural/ un-compacted state-- absorbs / storing-- up to 50% of
natural rainfall
SITE PLANNING-IMPACT OF BUILDINGS
WATER EFFICIENCY
 v • Establish a water budget for building and implement design that
minimizes the use of potable water by
 -- using low-flow plumbing fixtures and toilets and
 -- waterless urinals.
 -- Harvest, process and recycle rainwater,
 -- site storm water, and
 -- building gray water and
 -- identify appropriate uses within the building and site.
 vi Use on-site treatment systems that enables
 -- use of rain water for hand washing,
 -- gray-water for toilet flushing
 --rain and storm water for site irrigation, cooling tower make-up etc
 vii. Conserve water / preserve site and ground water quality by using
only indigenous, drought resistant and hardy trees, shrubs, plants and turf
that require no irrigation, fertilizers, pesticides or herbicides
WATER EFFICIENCY
WATER EFFICIENCY
WATER MANAGEMENT
 Optimizing water usage :
 Water efficient fixtures
i) W Cs-- conventional system use 13.5 liters/flush
-- --low flush uses 6 liters / latest ultra low flush uses 3 liters
-saving of 40-50% -Aim is to create waterless toilets
 ii) Urinal
 -- Conventional urinals use 4.5- 6 liters/flush,
 -- innovated flush system reduce water to 0.4 liters or more
 -- —Zero water urinals/ waterless urinals, Timed flush system ,Sensor
controlled automated system,
 iii) Faucets-
 -- Conventional faucet uses 15 liters of water/ minute–
 -- low flow faucets use 2 liters/minute
 Iv) Shower Heads–
 -- conventional showerheads generally use 11-26 liters/minute
-- low flow shower heads using 9 liters/min or even less-
----use narrow sprayer and effective mix of air and water
WATER EFFICIENCY- RAIN WATER HARVESTING
 Rainwater harvesting is a way to ;
 --capture rainwater at time of downpour
 -- recharge underground water/ use it later.
 -- In urban areas-- large construction leaves little exposed earth for water to
soak in.
 -- Most water-- runs wastefully through drains.
 -- Rainwater -- Popular method of conserving water in urban areas by
 -- stopping it from running off wastefully as sewerage water.
 -- recharges aquifers/ reservoirs of water ,
 -- raising level of underground water table.
 -- highly beneficial for trees /vegetation cover-- which draw mainly from
underground water.
 -- Since June 2001, Ministry of Urban affairs and Poverty Alleviation-- made --
rainwater harvesting mandatory in all new buildings
 --with a roof area of more than 100sq m and
 -- plots area of more than 1000 sq m—
 --Central Ground Water Authority (CGWA) --made rainwater harvesting
mandatory in all institutions
WATER EFFICIENCY-RAIN WATER HARVESTING
XERI-SCAPING
XERI-SCAPING
XERI-SCAPING
Reducing site Imperviousness
Conclusion
CONTEXT OF WATER- SUSTAINABLE WORLD
 An urgent need for creating water sustainable world because;
 --Water remains at core of sustainable development.
 --Water resources and services help in;
 -- poverty reduction,
 -- economic growth
 -- environmental sustainability.
 - food and energy security
 -- environmental health
 -- improvements in social wellbeing
 -- inclusive growth, affecting livelihoods of billions.
 -For creating water sustainable world we need to adopt
nature based solutions

STANDARDS OF PUBLIC SERVICES/AMENITIES
Infrastructure services Components/indicators
Basic standard/
benchmark
Water supply
Coverage of water supply 100%
Per capita supply of water per day 135 literssafe
Continuity of water supply 24 hours
Quality of water supplied 100% safe
Sewerage and waste water management
Coverage of sewerage services 100%
Coverage of toilets 100%
Coverage of waste water network services 100%
Collection efficiency of waste water 100%
Waste water treatment capacity 100%
Quality of waste water treatment Safe
Extent of reuse and recycling of waste water 20%
Solid waste management
Household level coverage 100%
Extent of municipal solid waste recovered 100%
Efficiency of collection of municipal solid waste 100%
Segregation of municipal solid waste 100%
Extent of scientific disposal of municipal solid waste 100%
Storm water drainage
Coverage of storm water drainage 100%
Incidence of water logging (flooding) Zero
Streetlights Street lights and their maintenance 100%
Road maintenance
Maintenance of municipal roads/streets 100%
Coverage of pucca roads/streets 100%
Menace of stray dogs and cattle on the road Zero
Local public transport
Extent of availability 50% total trips
Area connectivity 100%
Bus shelters and their maintenance 100%
Public Health
No. of hospital beds per 1000 5
Standard of sanitation and hygiene in public toilets 100%
Education Student-teacher ratio in primary schools 30
Housing
Affordable housing 100%
Housing with basic structural facilities like toilets and baths 100%
Floor area per person 18 sq. mtr.
Housing connected with civic services i.e., water & electricity 100%
MANAGING WATER IN BUILDINGS
•Making Buildings water efficient over entire life cycle
•Planning/ designing buildings with nature and natural
elements
•Promoting site optimisation/site climate
•--Preserve all hydrological/natural features of site
• Minimise building footprints
•Minimise number of toilets-Install low-flow toilets or
faucets and aerators
•Use low embodied water materials-
•Promote System optimization (i.e., efficient water
systems design, leak detection, and repair);
• Ensure Water conservation measures;
• Promote Water reuse/recycling systems
MANAGING WATER IN BUILDINGS
• Redefine water consumption standards in India- from 135 to 90
liters/capita/day--healthy life needs 75 lpcd.--European
cities, Malaga in Spain Leipzig in Germany- provide water @ 92
litres or less
•.Fix leaks- create hot line /reporting mechanisms
•Monitor cooling tower water
•Minimising use of fresh water during construction- tap rainwater
•Reclaim Grey water - Installing a Grey water System
•Reducing water Pressure
•Insulate piping
•Promote water efficient landscape- Xeriscaping -Planting Native
trees etc
•Educating users-Distribute flyers / pamphlets on wise water use
practices;
•Educating Professionals- to promote water efficient designs-
making innovations in water reducing strategies
Water Efficiency in Built Environment
Water Efficiency in Built Environment
Water Efficiency in Built Environment

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Water Efficiency in Built Environment

  • 1. Water Efficiency in Built Environment •Jit Kumar Gupta
  • 2.
  • 4. WATER – GLOBAL CONTEXT  80% of earth covered in water,  only 2% water fresh-- fit for drinking  1.6% of freshwater-- in glaciers/ polar ice caps.  2.4 billion people living- without access to improved sanitation facilities  nearly 700 million people-- not receiving their drinking-water from improved water sources,  global water demand increasing @ 1% per year – due to  --population growth  --economic development  -- changing consumption patterns,  -- Water consumption - continue to grow over next two decades  --- 3.6 billion people ( half global population) live in area-potentially water-scarce at least one month per year  -- this figure may go to 4.8–5.7 billion by 2050
  • 5. WATER AS A RESOURCE  Clean/ Safe water –Most valuable & scarce resource  Water - Elixir of life  Water- Promoter of Physical Development  Water-- Promoter of Economic development  Water – Critical for Sustainable Development  Water- Critical for Human Health  Water - Critical for social development.  Water- Generator of Employment-Three out of four jobs worldwide-- water-dependent.  Water- Sustainer of Human Living in terms of;  - food,  - energy,  - transportation  - business,  - nature,  - leisure,  - identity,  - culture and  social norms .
  • 6. WATER IN THE ECONOMIC CONTEXT  UN World Water Report-2016 -- globally 3.2 billion people dependent upon access to water/water-related services  Water shortages/ lack of access --may limit future economic growth  Water stress can—  -- Create security challenges,  -- force migration  -- undo progress  - promote poverty.  Water scarcity -- major concern- due to pressures exerted on water sources;  climatic change-- to further intensify crisis.  Managing ever-increasing water demand -- single greatest development challenge – nations/communities facing in 21st century
  • 8. WATER – INDIAN CONTEXT  India highly land stressed  India highly water stressed  India holds just 4% of world's fresh water-0.016%  16% of global population.  Half of India's water supply in rural areas--contaminated with toxic bacteria.  Every year, India loses 600,000 children-- due to illnesses associated with unclean drinking water.  As per World Bank – :  163 Million Indians- lack access to safe drinking water  210 Million Indians- lack access to improved sanitation  21% of communicable diseases linked to unsafe water  500 children under the age of five die from diarrhoea each day in India
  • 9. WATER CRISIS IN INDIA  --Water scarcity issues not new to India  --. Per capita water availability less than 1,700 cubic metre considered water stressed  -- India has 1,545 cubic metre  -. Water resources ministry predicts- water availability could plunge to;  -- 1,341 cubic metres in 2025  -- as low as 1,140 by 2050.  -- Different states hit by severe drought impacting people, agriculture, livestock etc.  - South India-- Karnataka, Tamil Nadu, Andhra Pradesh and Telangana have been victims of severe water crisis.
  • 10.
  • 12.
  • 13. WATER CONSUMPTION  Critical issue of water consumption – demand on supplying aquifer/sources exceeding its ability to replenish itself Key drivers of water demand / consumption: --Rapid growth of population --Increased Urbanization Increased per capita income  high consumption life style -Industrialization -- Water intensive fixtures --Water intensive agriculture crop --Large Misuse /wastage of water - Poor water management
  • 15.
  • 17. WATER MANAGEMENT-- KEY OBJECTS Protect water Conserve water Protect water quality  Reduce consumption Find Alternate Sources Make addition to water sources
  • 18. WATER MANAGEMENT STRATEGIES a) Use integrated process to assess:  -- existing water resources,  -- opportunities for reducing water demand, and -- alternative water supplies. b) Promoting Green building to encourages :  -innovative water-saving strategies  --that help projects use water wisely. c) Promoting effective water strategies include:  Installing efficient plumbing fixtures.  Use dual plumbing  Using non-potable water.  Installing -meters.  Choosing locally adapted plants.  Using Xeri-scaping. --a landscaping method developed especially for arid/semi-arid climates that utilizes water-conserving techniques -- use of drought-tolerant plants, mulch, and efficient irrigation
  • 19. APPROACH TO WATER MANAGEMENT : Principles for Managing water  -- Make buildings water efficient over entire life-cycle- embodied and operational use of water -- Promoting Slow the flow of water •-- Promoting Economical and optimal use of water •-- Minimising wastage •-- Minimising leakage •--Promoting Multiple Usage (reuse and recycling)  -- Using water efficient fixtures  -- Using native plants and trees  -Using low water embodied materials- Using materials requiring less water in making and using  -- Using low water construction technologies  - Using water efficient landscape- Using native trees/plants  -- Mulching trees/- plants to retain moisture, prevent evaporation  - Using alternate sources of water-- Rainwater water harvesting
  • 20. Optimization of water demand Use of water efficient systems Use of recycled water and rainwater harvesting SomecostimpactHighestcost impact Leastcostimpact COST EFFECTIVE STRATEGY FOR WATER EFFICIENCY
  • 22.
  • 23. SALIENT WATER FEATURES IN GREEN BUILDINGS  • Minimum water discharge • 100 % wastewater recycling • Rain water harvesting • Water efficient landscaping • High efficient water fittings • Water efficiency in A/C systems • Innovative waste water technology • Reduction of potable water use
  • 24. SALIENT WATER FEATURES IN GREEN BUILDINGS  -- Mandatory Requirement --- Rainwater Harvesting, Roof & Non-roof --Water Efficient Plumbing Fixtures Credit 1 Landscape Design Credit 2 Management of Irrigation Systems Credit 3 Rainwater Harvesting, Roof & Non-roof Credit 4 Water Efficient Plumbing Fixtures Credit 5 Waste Water Treatment and Reuse Credit 6 Water Metering
  • 25.
  • 26. WATER EFFICIENCY THROUGH BUILDING DESIGN  i. Recognize environmentally preferable design --for site/ storm water management  Design buildings - respecting existing natural flows / features of land,  Strategically locate buildings- to preserve key natural hydrological features.  Preserving areas of site- that serve as natural storm water retention / ground water infiltration / recharge systems.  ii. Preserve existing mature vegetation-- absorbing/ disbursing up to 30% of a site’s rainwater  iii Minimize building’s footprint—  iv minimize excavation/soil disturbance  --minimise compaction of existing topsoil  -- soil in natural/ un-compacted state-- absorbs / storing-- up to 50% of natural rainfall
  • 28. WATER EFFICIENCY  v • Establish a water budget for building and implement design that minimizes the use of potable water by  -- using low-flow plumbing fixtures and toilets and  -- waterless urinals.  -- Harvest, process and recycle rainwater,  -- site storm water, and  -- building gray water and  -- identify appropriate uses within the building and site.  vi Use on-site treatment systems that enables  -- use of rain water for hand washing,  -- gray-water for toilet flushing  --rain and storm water for site irrigation, cooling tower make-up etc  vii. Conserve water / preserve site and ground water quality by using only indigenous, drought resistant and hardy trees, shrubs, plants and turf that require no irrigation, fertilizers, pesticides or herbicides
  • 31. WATER MANAGEMENT  Optimizing water usage :  Water efficient fixtures i) W Cs-- conventional system use 13.5 liters/flush -- --low flush uses 6 liters / latest ultra low flush uses 3 liters -saving of 40-50% -Aim is to create waterless toilets  ii) Urinal  -- Conventional urinals use 4.5- 6 liters/flush,  -- innovated flush system reduce water to 0.4 liters or more  -- —Zero water urinals/ waterless urinals, Timed flush system ,Sensor controlled automated system,  iii) Faucets-  -- Conventional faucet uses 15 liters of water/ minute–  -- low flow faucets use 2 liters/minute  Iv) Shower Heads–  -- conventional showerheads generally use 11-26 liters/minute -- low flow shower heads using 9 liters/min or even less- ----use narrow sprayer and effective mix of air and water
  • 32. WATER EFFICIENCY- RAIN WATER HARVESTING  Rainwater harvesting is a way to ;  --capture rainwater at time of downpour  -- recharge underground water/ use it later.  -- In urban areas-- large construction leaves little exposed earth for water to soak in.  -- Most water-- runs wastefully through drains.  -- Rainwater -- Popular method of conserving water in urban areas by  -- stopping it from running off wastefully as sewerage water.  -- recharges aquifers/ reservoirs of water ,  -- raising level of underground water table.  -- highly beneficial for trees /vegetation cover-- which draw mainly from underground water.  -- Since June 2001, Ministry of Urban affairs and Poverty Alleviation-- made -- rainwater harvesting mandatory in all new buildings  --with a roof area of more than 100sq m and  -- plots area of more than 1000 sq m—  --Central Ground Water Authority (CGWA) --made rainwater harvesting mandatory in all institutions
  • 33.
  • 40. CONTEXT OF WATER- SUSTAINABLE WORLD  An urgent need for creating water sustainable world because;  --Water remains at core of sustainable development.  --Water resources and services help in;  -- poverty reduction,  -- economic growth  -- environmental sustainability.  - food and energy security  -- environmental health  -- improvements in social wellbeing  -- inclusive growth, affecting livelihoods of billions.  -For creating water sustainable world we need to adopt nature based solutions 
  • 41. STANDARDS OF PUBLIC SERVICES/AMENITIES Infrastructure services Components/indicators Basic standard/ benchmark Water supply Coverage of water supply 100% Per capita supply of water per day 135 literssafe Continuity of water supply 24 hours Quality of water supplied 100% safe Sewerage and waste water management Coverage of sewerage services 100% Coverage of toilets 100% Coverage of waste water network services 100% Collection efficiency of waste water 100% Waste water treatment capacity 100% Quality of waste water treatment Safe Extent of reuse and recycling of waste water 20% Solid waste management Household level coverage 100% Extent of municipal solid waste recovered 100% Efficiency of collection of municipal solid waste 100% Segregation of municipal solid waste 100% Extent of scientific disposal of municipal solid waste 100% Storm water drainage Coverage of storm water drainage 100% Incidence of water logging (flooding) Zero Streetlights Street lights and their maintenance 100% Road maintenance Maintenance of municipal roads/streets 100% Coverage of pucca roads/streets 100% Menace of stray dogs and cattle on the road Zero Local public transport Extent of availability 50% total trips Area connectivity 100% Bus shelters and their maintenance 100% Public Health No. of hospital beds per 1000 5 Standard of sanitation and hygiene in public toilets 100% Education Student-teacher ratio in primary schools 30 Housing Affordable housing 100% Housing with basic structural facilities like toilets and baths 100% Floor area per person 18 sq. mtr. Housing connected with civic services i.e., water & electricity 100%
  • 42. MANAGING WATER IN BUILDINGS •Making Buildings water efficient over entire life cycle •Planning/ designing buildings with nature and natural elements •Promoting site optimisation/site climate •--Preserve all hydrological/natural features of site • Minimise building footprints •Minimise number of toilets-Install low-flow toilets or faucets and aerators •Use low embodied water materials- •Promote System optimization (i.e., efficient water systems design, leak detection, and repair); • Ensure Water conservation measures; • Promote Water reuse/recycling systems
  • 43. MANAGING WATER IN BUILDINGS • Redefine water consumption standards in India- from 135 to 90 liters/capita/day--healthy life needs 75 lpcd.--European cities, Malaga in Spain Leipzig in Germany- provide water @ 92 litres or less •.Fix leaks- create hot line /reporting mechanisms •Monitor cooling tower water •Minimising use of fresh water during construction- tap rainwater •Reclaim Grey water - Installing a Grey water System •Reducing water Pressure •Insulate piping •Promote water efficient landscape- Xeriscaping -Planting Native trees etc •Educating users-Distribute flyers / pamphlets on wise water use practices; •Educating Professionals- to promote water efficient designs- making innovations in water reducing strategies