This document discusses challenges facing California's water supplies, including regulatory decisions that have reduced water deliveries from the Colorado River and State Water Project, as well as potential impacts from climate change. It notes increasing pressures on water supplies from population growth, contaminated water sources, and variability between wet and dry years. Several charts and graphs are presented showing historical supplies and projected impacts to underscore growing risks to the reliability of California's water resources.

1. TEST POSTING
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2. Goals
• Facilitate further dissemination of focused topic short-duration
events, consistent with GRA’s educational goals.
• Leverage today’s electronic technology to reduce costs and
hopefully allow moderate profitability with lower registrations
than in-person events.
• Use phased approach to improve on the currently existing
structure.
• Learn from past successes in conference calls/GRA
Casts/focused in-person meetings
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3. Pressure on Water Supplies is Increasing
• 2003 Colorado River decision
• Recent Delta-Smelt decision (State Water Project)
• Climate-change related issues
– Increased flooding/vulnerability
– Change in precipitation/timing
– Change in runoff/recharge to groundwater
– Change in surface water deliveries
• Contaminated water supplies
• Continued population growth
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4. Water Supply: Dry Years vs. Wet Years
• UWMP’s were relatively well vetted in 2005, however the
primary issue is we live in a relatively dry region and have
mixed water sources, in terms of local control and seasonal
variability
Source: DWR, 2007: http://www.publicaffairs.water.ca.gov/swp/supply.cfm
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5. Southern California’s Water Delivery
State Water Project
(Delta to Los Angeles)
Colorado River Aqueduct
(State Line to LA/San Diego)
Source: DWR, 2007: http://www.water.ca.gov/maps/allprojects.cfm
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6. 2003 Colorado River Supply Reduction
Source: Bay Delta PAC, 2003
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7. Delta-Smelt and the SWP
Source: MWD, 2007
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8. Climate Change Impacts
Climate
Change
Impacts
Source: DWR, 2007
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9. Climate Change and Water Resources
Sources: After DWR, 2006: baydeltaoffice.water.ca.gov/climatechange/ClimateChange_MetWaterDist_Chung_8-18-06.pdf
• Direct changes: http://www.seed.slb.com/en/scictr/watch/climate_change/images/global_temp1.jpg
– Air temperature
– Sea level rise
– Extreme weather events
– Precipitation form, timing and quantity
• Effects:
– Water supplies
– Water demands
– Water quality
– Ecosystems
– Systems operations
– Flood management
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10. Water Supply Timeline
• 2001: SB 610/221: Water Supply Planning
• 2003 Colorado River decision
• 2004: Santa Clarita UWMP, contamination challenge
• 2005 Urban Water Management Plan updates
• 2005: Governor’s Executive Order on Climate Change
– 2005: DWR Delivery Reliability Report, next due in 2007
• 2006: AB 32, State reports on climate change impacts
• 2007: Delta-smelt issues, climate change prediction
refinements
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11. Future Timeline
• 2007: GHG CARB Early Action Decisions
• 2009: SWP Delivery Reliability Report
• 1/1/2010: GHG Early Actions Become enforceable
• 2010: UWMPs due
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