Department of Water Resources issues December 2013 Sacramento River Accretion Forecast

From the Department of Water Resources:

The Northern Sierra 8-station precipitation index (8SI) as of Dec 8 was 3.2 inches, which is 28% of its historical average to date (Dec 5) of 11.5 inches.  The Southern Sierra 5-station precipitation index (5SI) as of Dec 8 was 3.0 inches, which is 36% of its historical average to date (Dec 5) of 8.4 inches.

With the continued low levels of precipitation this year the October monthly Sacramento River accretion was -85 TAF, which is about the second driest October in the Sacramento River accretion record.  The November monthly Sacramento River accretion was 81 TAF, which is about the third driest November in the Sacramento River accretion record.

The WY 2013 Sacramento River accretions for Apr-Sep months rank as the eighth driest in the 65-year record, however for the entire water year it was only the twenty-second driest.

Some precipitation has arrived this season but with both Northern and Southern Sierra precipitation indices around a third of their seasonal average precipitation to date there is a significant gap to make up just to get to average.

As of today, reservoir storages for Shasta, Oroville, Bullards Bar, and Folsom together have 65% of average storage to date and 37% of combined reservoir storage capacity. The major San Joaquin basin reservoirs together have about 83% of average storage to date and 48% of total storage capacity. The major Tulare basin reservoirs together have about 50% of average storage to date and 10% of total storage capacity.

More reservoir storage information can be found at: http://cdec.water.ca.gov/cgi-progs/reservoirs/RES

Download the accretion forecast spreadsheet here: snowfc201312

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2 comments

  • Phil Isenberg

    I give up. What does ‘accretion’ mean in the context of this post? The usual definition is something like, ‘gradual increase in size’, but that seems like an odd use of the word in a dry water year like this one.

    • Maven

      This is an update I signed up for from DWR. It’s only issued December through the spring, so I imagine in most years, if we had precipitation anywhere near normal, there would have been some accretion. Let’s hope they can use the word more next month!

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