Urban Water Demand Trends Conservation and the Future of Residential Water Use Peter Mayer, P.E.

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Presentation transcript:

Urban Water Demand Trends Conservation and the Future of Residential Water Use Peter Mayer, P.E.

Water Demand Management: Why? Water shortages Expensive to develop new supplies Climate change

Demand Management = Serious Business

vs Notorious Recent Historical Droughts PDSI = Palmer Drought Severity Index PDSI was developed by Wayne Palmer in the 1960s and uses temperature and rainfall information in a formula to determine dryness. Source: Dr. Martin Hoerling, NOAA Earth System Research Laboratory

Utilities are Asking: Where did the demand go? City of Westminster, CO average annual household water use, 2000 – 2010, with trend line

Seattle Public Utilities

Forecast Without Conservation

Firm Yield in 2013

Forecast With Conservation

2013

A brief history of demand forecasting in Seattle

Seattle Saved $725 million PV Cost of New Supply $800 Million PV Cost of Conservation: $ 75 Million _______________________________________________________________ NPV : $725 Million

Avg. Annual Use Per SF Home (kgal) Source: Mayer, P. et. al Residential End Uses of Water Update. AWWA - ACE, Denver, CO.

1999 REUWS vs REUWS gallons per household per day

2014 REUWS Update

Homes Meeting Efficiency Criteria Toilet < 2 gal., Clothes washer <30 gal.

Technological change Behavioral change More intense and frequent drought Water demand management at the retail level

Peter Mayer, P.E.

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