[env-trinity] CVP 2009 Water Allocation as of March 20

Byron Leydecker bwl3 at comcast.net
Sat Mar 21 11:52:14 PDT 2009


Press Release Bureau 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 at mp.usbr.gov for additional information

 

Byron Leydecker, JcT

Chair, Friends of Trinity River

PO Box 2327

Mill Valley, CA 94942-2327

415 383 4810 land

415 519 4810 cell

 <mailto:bwl3 at comcast.net> bwl3 at comcast.net

 <mailto:bleydecker at stanfordalumni.org> bleydecker at stanfordalumni.org
(secondary)

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