The California Department of Water Resources has reduced its estimate of the amount of water the State Water Project will deliver this year.

DWR on Wednesday dropped its projected delivery total, or allocation, from 60 percent to 50 percent of the requested amount of slightly more than 4 million acre-feet.

‘’Stubbornly dry conditions this winter give us no choice but to roll back our water supply estimate,” says DWR Director Mark Cowin. “We continue to hope, however, that wetter conditions in the remaining winter weeks will allow us to boost deliveries back up.”

DWR says that precipitation so far this winter has been only about half of normal and the mountain snowpack is less than a third of normal.

Water Year (Oct. 1-Sept. 30) runoff from rain and snow is forecasted to be far below average in both the Sacramento River and San Joaquin River systems. The median runoff forecast of 9.4 million acre-feet for the Sacramento River system would be the 16th driest in 106 years.

The February 1 median water year runoff forecast of 3.2 million acre-feet for the San Joaquin River system would be the 21st driest in 111 years.

Average runoff is 18.3 million acre-feet for the Sacramento system, and 5.9 million acre-feet for the San Joaquin.

Much of California’s water comes from the mountainous country from Shasta Lake in the north to the American River basin in the south. DWR’s eight precipitation gages covering this area recorded an impressive 130 percent of average rainfall and snow in October, but only 43 percent in November, 4 percent of average in December, 84 percent of average in January, and 18 percent of a normal February total to date this month. Overall, this “Eight-Station Index” area to date is at 51percent of its seasonal precipitation average. Records go back to 1920.

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