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Sustainable Operations - Water in the Built Environment

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

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  1. Sustainable Operations- Water in the Built Environment Sustainable Operations Summit 2008 Sarah H. Baker

  2. World View of Water 0.5% 2.5% frozen 97%

  3. 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.

  4. World View • Industrial Use • power plants • ore and oil refineries • manufacturing plants 1 World Business Council for Sustainable Development, Water Facts and Trends, 2005.

  5. Per capita, gallons World View Source: World Business Council for Sustainable Development, Water Facts and Trends, 2005.

  6. 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

  7. 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)

  8. Implementation • Assess and Prioritize • Implement stategies through EMS • Engineering practices = Changing fixtures • Behavioral practices = Changing attitudes • Monitor progress

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

  10. 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

  11. Implement Strategies • Use national Environmental Management System (EMS) to define Action Plans • Continual improvement of performance through EMS feedback loops

  12. 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

  13. 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

  14. 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!)

  15. 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%

  16. Engineering Practices Leak detection • Leaks are 5.5% of water use • Potential for major property damage

  17. Behavioral Practices Indoor water use

  18. Behavioral Practices Outdoor water use

  19. Questions?

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