Snow Survey Boosts Runoff Predictions

  • by California Department of Water Resources
  • Apr 2, 2019
  • Water News

The Department of Water Resources (DWR) today conducted the fourth Phillips Station snow survey of 2019. The manual survey recorded 106.5 inches of snow depth and a snow water equivalent (SWE) of 51 inches, which is 200% of average for this location.

Statewide, the Sierra Nevada snowpack is 162% of average. California has experienced more than 30 atmospheric rivers since the start of the water year, with six in February alone, and statewide snow water equivalent has nearly tripled since February 1. Snow water equivalent is the depth of water that theoretically would result if the entire snowpack melted instantaneously. It is an important tool used by water managers across the state to estimate anticipated spring runoff.

“With full reservoirs and a dense snowpack, this year is practically a California water supply dream,” said DWR Director Karla Nemeth. “However, we know our long-term water supply reliability cannot rely on annual snowpack alone. It will take an all-of-the-above approach to build resiliency for the future.”

Snowpack is an important factor in determining how DWR manages California’s water resources each year to meet demands. On average, the Sierra snowpack supplies about 30% of California’s water needs as it melts into streams and reservoirs in the spring and early summer to meet water demands throughout the year. The April results are a key indicator for the rest of the year’s water supply. The snowpack’s water content typically peaks around April 1, after which the sun’s higher position in the sky begins to accelerate snow melt.

While the April 1 snowpack data is good news for water supply, state officials warn there could be flooding risks later this spring.

“With great water supply benefits comes some risk,” said Jon Ericson, DWR Chief of the Division of Flood Management. “Based on snowpack numbers, we have the potential for some minor flooding due to melting snow so we remind folks to always stay vigilant and aware.”

The state’s largest six reservoirs currently hold between 106% (Oroville) and 132% (Melones) of their historical averages for this date. Lake Shasta, California’s largest surface reservoir, is 109% of its historical average and sits at 89% of capacity.

 

 

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