Sustainable operations water in the built environment
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Sustainable Operations - Water in the Built Environment. Sustainable Operations Summit 2008 Sarah H. Baker. World View of Water. 0.5%. 2.5% frozen. 97%. World View. For high-income countries, water use is: 30% Agricultural 59% Industrial 11% Domestic.

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Sustainable operations water in the built environment l.jpg

Sustainable Operations- Water in the Built Environment

Sustainable Operations Summit 2008

Sarah H. Baker


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World View of Water

0.5%

2.5% frozen

97%


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World View

  • For high-income countries, water use is:

    • 30% Agricultural

    • 59% Industrial

    • 11% Domestic

Source: World Business Council for Sustainable Development, Water Facts and Trends, 2005.


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World View

  • Industrial Use

    • power plants

    • ore and oil refineries

    • manufacturing plants

1 World Business Council for Sustainable Development, Water Facts and Trends, 2005.


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Per capita, gallons

World View

Source: World Business Council for Sustainable Development, Water Facts and Trends, 2005.


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Federal Government

  • Uses 244-256 billion gallons of water annually (equal to water use of Michigan)

  • Requires 138 billion BTUs of energy to process and use water (98% used to heat water)

  • Could conserve 40% of water—102.4 billion gallons— annually with moderate efforts (enough water for Iowa)

250,000,000,000 gallons

138,000,000,000 BTUs

102,400,000,000 gallons

Source: Federal Energy Management Program


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Federal Directives

  • EO 13423 - Strengthening Federal Environmental, Energy and Transportation Management

    • reduce water consumption intensity through life-cycle cost-effective measures by 2 % annually through the end of fiscal year 2015 (16% total)

  • Energy Independence and Security Act (EISA)


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Implementation

  • Assess and Prioritize

  • Implement stategies through EMS

    • Engineering practices = Changing fixtures

    • Behavioral practices = Changing attitudes

  • Monitor progress


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Residential Water Use

Source: 1999 Aquacraft, Inc. and American Water Works Association Research Foundation


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Assess and Prioritize

  • Water audits (10% of buildings/year)

    • Required by EO 13423 Instructions

    • Part of our facilities inspections

    • Use life-cycle cost analysis

  • Outdoor water ~60% of water use

  • Bathroom ~45% of indoor water use

  • Leaks ~6% of water use


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Implement Strategies

  • Use national Environmental Management System (EMS) to define Action Plans

  • Continual improvement of performance through EMS feedback loops


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Outdoor Water Use

  • Climate-appropriate landscapes

  • Water-efficient irrigation systems

  • Vehicle wash systems

    • If every car owner in the US who washes a car at home went to a water-recycling car wash for the next wash, the savings would total more than 4 billion gallons

  • Alternate water sources


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Alternate Water Sources

  • Rainwater harvesting system

    • Capture (roof and gutters)

    • Storage (barrels or tanks)

    • Delivery (pipes, pumps, and valves)

  • Details

    • Cost $500 - $10,000+

    • Depends on rainfall and desired use

    • Properly size pipe, tank, and pump


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Alternate Water Sources

Example:

  • 10” rain/year (NM)

  • 5000 ft2 office

  • 31,000 gallons water/year

Example:

  • 35” rain/year (TX)

  • 5000 ft2 office

  • 109,000 gallons water/year

  • (at 50 gallons per car wash, this is 2180 carwashes!)


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Engineering Practices

Fixtures (bathroom)

  • Toilet

  • Low-flow showerheads

  • Faucet aerators

  • Low-flush toilets - 5.4 yrs. cost recovery

  • Displacement device - 1 to 2 gal. per flush

  • Inexpensive

  • Reduce indoor water use by ~6% each

  • Inexpensive

  • Reduces faucet water use by up to 60%


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Engineering Practices

Leak detection

  • Leaks are 5.5% of water use

  • Potential for major property damage


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Behavioral Practices

Indoor water use


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Behavioral Practices

Outdoor water use



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