A Preliminary Analysis of the Impacts of Climate Change on the Reliability on West Side Water Supplies Richard Palmer and Margaret Hahn Department of Civil.
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Presentation on theme: "A Preliminary Analysis of the Impacts of Climate Change on the Reliability on West Side Water Supplies Richard Palmer and Margaret Hahn Department of Civil."— Presentation transcript:
A Preliminary Analysis of the Impacts of Climate Change on the Reliability on West Side Water Supplies Richard Palmer and Margaret Hahn Department of Civil and Environmental Engineering University of Washington
Talk Overview Challenges of urban water supply Infrastructure today Future water demand Change in streamflows Ability to provide drinking water Responding to climate change
Points to be made Climate change will impact the watersheds providing urban supplies Growing water demands will also stress urban supplies Competition for water will increase during periods when less is available Long-lead time, adaptive planning is needed to face these challenges
Urban Water Resources The urban areas are served by an infrastructure that was constructed in the early and mid-20th century The yield of some of these systems is not significantly larger than today’s demands Interties within the region and new sources provide interesting alternatives
Water Demands Puget Sound area water demand is expected to increase in average years from 435 to nearly 500 mgd (15%) by 2020 The Portland area demand is expected to grow from 120 to 150 mgd (25%) by 2020 This increase in demand will stress systems that are already near system yields
Impacts on Streamflow Climate change by 2040 will significantly impact the timing of the region’s runoff The lack of late spring snowpack will decrease the “stored” water available for the summer This will extend the draw-down period and make the region more susceptible to drought
Impacts on Storage Climate change by 2040 will significantly impact the annual minimum storage Storages similar to those encountered in 1987 and 1992 will become more common place, even with no increases in demands Significant changes in operations and/or available infrastructure will be required.
Summary Climate change will impact the amount and timing of when streamflows will be available The changes in flows will impact storages in urban water supply reservoirs making curtailments more likely Solutions to these problems require careful, long-term adaptive planning to ensure consideration of the most effective alternatives