Fatal errors in DWR’s runoff forecasting: comments to the State Water Resources Control Board

The State Water Resources Control Board held a workshop today (March 16, 2022) on Sacramento River Temperature Management. Among the topics considered were "hydrologic conditions, including operations, forecasting, and accounting." These were my comments. This is Deirdre Des Jardins with California Water Research. I’m the physicist who sent comments to DWR in 2012 predicting the … Continue reading Fatal errors in DWR’s runoff forecasting: comments to the State Water Resources Control Board

We need to step up our game on evaluating drought risk

elevated drought risk impact Feb 20 2022

The Department of Water Resources’ new California Water Watch website is a great new resource, however, the site appears to miss information on the rapidly developing drought. The website displays statewide precipitation for the water year to date. It also displays a map of “Drought Risk Impacts” based on precipitation being less than 70% of … Continue reading We need to step up our game on evaluating drought risk

DWR 2006 study: “too much risk” taken with reservoir operations

In 2006, for the first California Climate Assessment, DWR published a study of operations of the State Water Project and Central Valley Project with climate change. The report was titled, "Progress on Incorporating Climate Change Into Management of California’s Water Resources." DWR's 2006 modeling predicted the current crisis, with Shasta, Folsom, and Oroville reservoirs being … Continue reading DWR 2006 study: “too much risk” taken with reservoir operations

TUCP: California Water Research asks Water Board to require report on 2021 runoff forecast errors

NWS May 2021 snowpack

California Water Research filed a protest of the May 17 Temporary Urgency Change Petition by the California Department of Water Resources and the US Bureau of Reclamation. We requested that the State Water Resources Control Board require a written report by DWR and USBR on the methodology used for the runoff forecast used in this … Continue reading TUCP: California Water Research asks Water Board to require report on 2021 runoff forecast errors

State Water Contractors objected to development of a drought operations strategy for the State Water Project and Central Valley Project

Lake Oroville March 2021

Our May 10, 2021 blog post, DWR Chief Engineer warned of climate change draining Northern California reservoirs explained how Francis Chung, the Department of Water Resources’ Bay-Delta modeling chief, sounded the alarm in 2010 that climate change could drain major Northern California reservoirs. Chung recommended that DWR develop a reoperation strategy for the State Water Project … Continue reading State Water Contractors objected to development of a drought operations strategy for the State Water Project and Central Valley Project