1. Eric Bergh Manager of Resources October 28 th, 2009 Climate Change and Water Supply An Urban Water Agency’s Perspective

3. 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.

4. Southern California Service Areas

5. Climate Change – What’s Happened Already? Excerpt from Managing an Uncertain Future. Climate Change Adaptation Strategies for California’s Water - DWR, October 2008

6.  “… 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.” Climate Change – An Ominous Forecast

7.  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. S 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 n “Warming temperatures, combined with changes in rainfall and runoff patterns will exacerbate the frequency and intensity of droughts.” n “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.”

8. Questionable reliability of imported water supply has led to…  Increased resource diversity  Focus on local resource projects

9. Las Posas Basin ASR Project

10. Program Concept

11. Las Posas Basin ASR Project

13. Historical LPB Storage 90,000 af

14. So Cal’s Storage Capacity For Annual Seasonal and Dry Year Needs Lake Mathews Lake Skinner Desert / Coachella Semitropic Castaic Perris No. Las Posas Arvin Edison Diamond Valley Lake Year ’90’90’95’95’00’00’05’05 Million Acre-Feet 1.0 2.0 3.0 San Bernardino Valley North Kern & Mojave Demo Kern Delta Prop. 13 Programs (start-up) Greater than 10x Increase

15. Phase 1 Phase 2 Salinity Management Pipeline Phase 3

16. 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

17. Groundwater Desalting Semi-permeable Membrane Concentrate Pure Water Flow

18. Delivering the 54-inch diameter HDPE Pipe to Hueneme Road

19. Hueneme Outfall Replacement Project Surfside Dr.

21.  Important to note… climate change isn’t only pressing concern – ESA issues as well  Maximize conjunctive use opportunities  Expansion of new, non-traditional local supplies Climate Change – Water Supply Impact Summary of Response Climate Change – Water Supply Impact Summary of Response

22. www.calleguas.comebergh@calleguas.com