[Water_news] 1. DWR'S CALIFORNIA WATER NEWS - Top Item for 3/20/09

Department of Water Resources

California Water News

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March 20, 2009

 

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Press ReleaseBureau of Reclamation Updates 2009 Central Valley Project Water Supply Allocation

USBR – 3/20/09

Today, the Bureau of Reclamation announced the March update to Water Year 2009 allocations for the Federal Central Valley Project.  This water supply update is based on the March 1 runoff forecast from the California Department of Water Resources. 

Reclamation prepared two forecasts:  a conservative forecast with a 90-percent chance of having runoff greater than forecasted (90-percent probability of exceedence) and a median forecast with a 50-percent chance of having runoff greater than forecasted (50-percent probability of exceedence).  In the 90-percent exceedence runoff forecast, the unimpaired water year inflow into Shasta Reservoir is about 3.18 million acre-feet.  Shasta Reservoir unimpaired inflow is the criteria used to determine shortages to water right settlement contractors, including the Exchange Contractors, and refuges.

Reclamation traditionally expresses the monthly forecast as a percentage (see summary table) of the contract total for each of the contract categories.  The official allocation is based on the 90-percent exceedence forecast.  The 50-percent exceedence forecast is provided for informational and planning purposes.

Mid-Pacific Region Water Year 2009 Supply Forecast Update March 20, 2009
Probability of Exceedence Forecasts	Sacramento Valley Index* (Percent of Average/Water Year Classification)	North of Delta Allocation				South of Delta Allocation
		Ag	M&I	R	WR	Ag	M&I	R	WR
Dry Forecast (90%)	51% / Critical	5%	55%**	75%	75%	0%	50%**	75%	77%
Median Forecast (50%)	61% / Critical	15%	65%**	100%	100%	15%	65%**	100%	100%
Ag = Agriculture  M&I = Municipal & Industrial (supply based on historical deliveries)  R = Refuges  WR = Water Rights *The Sacramento Valley Index is a calculated estimate of the unimpaired runoff from the Sacramento River and its major tributaries and is used to determine the water year type. **The allocation percentage for M&I is approximate and may be adjusted to meet public health and safety needs.

The allocation for the Friant Division Contractors will be 65 percent Class 1 water and 0 percent Class 2 water based on the 90-percent exceedence forecast. 

Reclamation continues to coordinate with the State of California, the U.S. Fish and Wildlife Service, the National Marine Fisheries Service, and other Federal, State, and local organizations to fulfill its water supply obligations, which include senior water rights, water quality, and the protection of fish and wildlife and associated habitats.

"Reclamation will continue to monitor runoff and reservoir storage conditions in the event changing conditions will support higher allocations," stated Donald Glaser, Regional Director for the Mid-Pacific Region.  "In the meantime, Reclamation will use all water management tools at our disposal to meet our obligation to deliver water responsibly."

In the coming months, updates to this forecast will be announced as circumstances warrant.  Information will be posted on the Region's website at http://www.usbr.gov/mp.  Please contact the Public Affairs Office at 916-978-5100 or e-mail ibr2mprpao@mp.usbr.gov for additional information. #

http://www.usbr.gov/newsroom/newsrelease/detail.cfm?RecordID=27221

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