Eric Bergh

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Climate Change and Water Supply An Urban Water
Agencys Perspective
Eric Bergh Manager of Resources October
28th, 2009
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Calleguas Municipal Water District

• Calleguas supplies water to 22 water agencies and
  cities serving about 600,000 people in southern
  Ventura County.
• Calleguas primary source of water is the
  Metropolitan WDSC.

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Southern California Service Areas
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Climate Change Whats Happened Already?
Excerpt from Managing an Uncertain Future.
Climate Change Adaptation Strategies for
Californias Water - DWR, October 2008
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Climate Change An Ominous Forecast

• the Sierra snowpack will experience a 25 to 40
  percent reduction from its historic average by
  2050.
• Climate change is also anticipated to bring
  warmer storms that result in less snowfall at
  lower elevations, reducing the total snowpack.
• Warming temperatures, combined with changes in
  rainfall and runoff patterns will exacerbate the
  frequency and intensity of droughts.
• Warmer temperatures will likely increase
  evapotranspiration rates and extend growing
  seasons, thereby increasing the amount of water
  that is needed for the irrigation of many crops,
  urban landscaping and environmental water needs.

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• Formed in 2008 to
• improve research into the impacts of climate
  change on water utilities
• develop strategies for adapting to climate change
• implement tactics to reduce their greenhouse gas
  emissions.
• Comprised of
• Metropolitan Water District of Southern
  California
• Denver Water
• New York City Department of Environmental
  Protection
• Portland Water Bureau
• San Diego County Water Authority
• San Francisco Public Utilities Commission
• Seattle Public Utilities
• Southern Nevada Water Authority
• Warming temperatures, combined with changes in
  rainfall and runoff patterns will exacerbate the
  frequency and intensity of droughts.
• Warmer temperatures will likely increase
  evapotranspiration rates and extend growing
  seasons, thereby increasing the amount of water
  that is needed for the irrigation of many crops,
  urban landscaping and environmental water needs.

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Questionable reliability of imported water supply
has led to

• Increased resource diversity
• Focus on local resource projects

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Las Posas Basin ASR Project
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Program Concept
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Las Posas Basin ASR Project
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Historical LPB Storage
90,000 af
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So Cals Storage CapacityFor Annual Seasonal and
Dry Year Needs
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Salinity Management Pipeline
Phase 3
Phase 2
Phase 1
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By providing a means of transporting saline water
to the ocean, the SMP

• Increases water reliability by allowing for
  40,000 acre feet per year of saline groundwater
  to be put to use
• Reduces salinity of local supplies by removing
  170,000 pounds of salt from the watershed

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Groundwater Desalting
Concentrate
Pure Water
Flow
Semi-permeable Membrane
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Delivering the 54-inch diameter HDPE Pipe to
Hueneme Road
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Hueneme Outfall Replacement Project
Surfside Dr.
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Climate Change Water Supply Impact Summary of
Response

• Important to note climate change isnt only
  pressing concern ESA issues as well
• Maximize conjunctive use opportunities
• Expansion of new, non-traditional local supplies

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www.calleguas.com ebergh_at_calleguas.com