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California Water Outlook Trending Dry; Supply Depends on Rainy Season Outcome

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It’s trending toward a dry water year. Long-range weather forecasts aren’t pointing to heavy precipitation in the coming months.

However, forecasting weather is iffy. It is possible that a series of atmospheric rivers form to bring a deluge like the Miracle March storms in 1991, but it’s just as possible that scant rains fall the next couple of months, perhaps starting another drought cycle.

The rainy season is November through March with December, January and February as the wettest months. December proved to be relatively dry. However, January started with intermittent rain and snow.

Snowpack

According to the Department of Water Resources (DWR) index of rain and snow gauges in the northern Sierra, the snowpack is about 55% of average.

Yet, when measured manually at Phillips, snow depth is reported at 30.5 inches of snow and 10.5 inches of “snow water content,” translating to mean water content is 93% of normal for this time of year. The measurement could be specific to the location of Phillips and not representative of overall conditions, according to DWR.

Drought Monitor

The U.S. Drought Monitor indicates 100% of California is experiencing some form of drought, ranging from abnormally dry to exceptional drought. Most of the state falls in the severe (40%) to extreme (32%) drought status, which indicates water supplies will be stressed if it continues to be dry.

Severe status indicates a longer fire season, stressed trees, inadequate grazing land, increase in wildlife disease, low river flows, and an increase in water temperature, leading to programs to divert water for fish.

Extreme drought indicates grazing is nonexistent and livestock much be fed expensive supplemental feed; fruit trees bud early; dairy operations close; river levels drop, impeding fish migration; water supply is inadequate for agriculture, wildlife and urban needs; hydropower declines; and water sanitation becomes a concern.

Water supplies in the state’s two biggest reservoirs are declining—Shasta is at 45% of capacity, which is 72% of average for this time of year, and Oroville is at 35% of capacity and 57% of average.

Water Allocations

DWR estimates only 10% of requested allocations will be met for State Water Project supply in 2021. Most years, initial allocations range from 20% to 40%.

A 10% allocation roughly equates to 422,848 acre-feet of water to be shared by 29 state water contractors that service 27 million Californians and 750,000 acres of farmland in the San Joaquin Valley, San Francisco Bay Area and Southern California.

The federal Central Valley Project (CVP) does not release its allocation numbers until February. In a normal year, CVP delivers about 7 million acre-feet of water for agricultural, urban and wildlife uses—5 million acre-feet for farms and 600,000 acre-feet for municipal and industrial use, mostly in the Central Valley.

Critical Months

The next couple of months will be crucial to the water supply for 2021. The possibility of coping with a drought during a pandemic that requires much more sanitation using water is an overwhelming logistical problem. Restricting water use, either through curtailments of water rights or increases in price, adds to the burden businesses already shoulder.

If nothing else, water supply concerns should prompt the state to look seriously at means of increasing water supplies through reuse, recycling, desalination, purification and increased storage.

Staff Contact: Valerie Nera

Valerie Nera

This post was originally published on this site

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