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[Water_news] 1. DWR'S CALIFORNIA WATER NEWS - Top Item for 4/02/09

Department of Water Resources

California Water News

A daily compilation for DWR personnel of significant news articles and comment

 

April 2, 2009

 

1. Top Item –

 

Outlook is for stress to state's water supply

The state report released Wednesday found that "changing precipitation patterns will result in longer and drier droughts and decreased groundwater levels, coupled with a higher frequency and severity of extreme flooding events."

 

Researchers forecast that in some years, water levels in the state's mainstay reservoirs - Shasta, Oroville, Folsom and Trinity - could fall below outtake pipe levels, effectively shutting off the spigot.

 

Winter snowpack in the Sierra Nevada - a built-in water-storage system and the backbone of the state's water supply - will take the biggest hit as global temperatures rise. The report points to a minimum 25 percent decline in snowpack by 2050.

 

What's more, snowpack is expected to peak and melt earlier. That means more precipitation will fall as rain - raising the potential for overwhelming the state's increasingly fragile plumbing system.

 

The ailing Sacramento-San Joaquin River Delta sits squarely in the crosshairs, not just for rising floodwaters but also for higher sea levels.

 

With California's population expected to swell to nearly 60 million in 41 years - mostly in cities and suburbs - one scenario in the report suggests that supplies would come from agriculture, the state's largest water user.

 

Wildlife and ecosystems, whose water interests already compete with urban and agriculture users, also could be affected.

If the climate becomes significantly drier and water supplies reach rock-bottom levels, California may elect to reduce stream flows that are critical for fish spawning.

 

The study said state officials are working on broader conservation efforts, ecosystem improvement, regional water management plans and developing additional supplies through water recycling and seawater desalination.#

 

http://www.sfgate.com/cgi-bin/article.cgi?f=/c/a/2009/04/02/MNFT16R1D7.DTL

 

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