When Will California’s Drought End?

A skier surveys the view of South Lake Tahoe from Heavenly ski resort.

A skier surveys the view of South Lake Tahoe from Heavenly ski resort. (Olivia Allen-Price)

This winter’s first big storms, fueled by El Niño, soaked much of the Bay Area in recent weeks.

And there’s been a flurry of attention to the gradually rebuilding Sierra snowpack, the “frozen reservoir” that meets about a third of the state’s water needs.

But depleted reservoirs are still catching up. December rains added 293 billion gallons to the 154 major state and federal reservoirs in California, which sounds substantial. But by December’s end, that was still only 31 percent of capacity.

And rain totals have been both literally and figuratively all over the map.

Many parts of Northwestern California have been soaked—Eureka is at 128 percent of normal precipitation for this time of year. While sections of the Bay Area, like Oakland airport, are at 74 percent of normal.

Traffic plows through flood waters in San Francisco during early January rains.
Traffic plows through flood waters in San Francisco during early January rains. (Olivia Allen-Price)

With more rain expected this week, one question looms: when will California be out of a drought?

Three Things That Would End the Drought

Legally, it’s when Governor Jerry Brown declares it over.  However, scientific experts say three things would signify the drought’s end.

  • A replenished groundwater supply (but that could take 50 years)
  • Making up for our rainfall deficit (that’d likely take over a year)
  • Full reservoirs

The last scenario would really indicate the end of a drought, according to many experts.

Based on past drought-busting years, the state Department of Water Resources estimates that precipitation would need to reach about 150 percent of average — about 75 inches — in key Northern California watersheds.

California’s largest reservoir, Lake Shasta, is currently only 33 percent full.

For more detail on El Niño, the drought and what to expect in the weeks ahead,  KQED news anchor Danielle Venton spoke with Paul Rogers, KQED’s managing editor for science. You can listen to their audio interview at the top of the story.

When Will California’s Drought End? 11 January,2016Lindsey Hoshaw

  • Panagiotis

    We really go to do something!

  • nineteen50

    No mention of the groundwater basin, why?

  • eldh

    You want to fill the reservoirs. Don’t let out more than comes in. Build the Sites Reservior, enlarge Shasta Dam, complete Auburn/Folsom Dam! Doesn’t take arocket scientist to figure it out! Boxer and Pelosoi has fought this solution for many years. This is a political problem. Don’t build more homes until we build more storage! We are a semi-arid region. We have over used our natural given water. We Must Store More!

    • Barron_Park

      Housing prices are sky-high, and you want to STOP building more homes?

  • eldh

    Then build more homes moran! No water to drink, take a shower in the rain. We don’t even have the infrastructure to support more growth. You are an idiot and deserve what greed deserves!

  • californucopia

    What about the ability to move water through the delta? If you have full reservoirs in the north, but can’t move it to the cities and farms, there is still a drought caused by regulations on pumping.

Author

Lindsey Hoshaw

Lindsey Hoshaw is an interactive producer for KQED Science. Before joining KQED, Lindsey was a science correspondent for The New York Times, The Boston Globe, Forbes and Scientific American. On Twitter @lindseyhoshaw

Author

Paul Rogers

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