Author Archives: jaylund

About jaylund

Professor of Civil and Environmental Engineering Director, Center for Watershed Sciences University of California - Davis

Increasing groundwater salinity changes water and crop management over long timescales

by Yiqing “Gracie” Yao and Jay Lund Salinity has often become a major limit for irrigated agriculture in semi-arid regions, from ancient Mesopotamia to parts of California today. A previous blog post showed that conjunctive use with more saline groundwater … Continue reading

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Looking for a new challenge? – Retrain as a Delta Smelt

Help restore one of California’s most endangered species while supporting California’s water supplies in a time of drought. The Federal government is beginning a program for the unemployed to retrain as much-needed Delta Smelt.  Following a two-day course, candidates will … Continue reading

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California’s New Drought

By Jay Lund, Andrew L. Rypel, and Josue Medellin-Azuara As March begins to drag on with little precipitation in the forecast and few weeks left in California’s traditional wet season, we are in another dry year. This is California’s second … Continue reading

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Managing Water and Crops with Groundwater Salinity – A growing menace

by Yiqing “Gracie” Yao and Jay Lund Salinity is an eventual threat to agriculture and groundwater sustainability in parts of California, and other irrigated parts of the world. Irrigation, lower groundwater levels, and natural conditions have dramatically increased groundwater salinity … Continue reading

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Groundwater Salinization in California’s Tulare Lake Basin, the ABCSAL model

By Rich Pauloo and Graham Fogg Lower groundwater levels can prevent drainage of water and salts from a basin and increase aquifer salinity that eventually renders the groundwater unsuitable for use as drinking water or irrigation without expensive desalination. Pauloo … Continue reading

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February 1: Is California Still Heading for a Multi-Year Drought?

by Jay Lund, Peter Moyle, and Andrew Rypel This updates a post from December on the likelihood of California entering a second dry year. Normally, a second dry year brings drought operations for California’s overall water system operations. Today, it … Continue reading

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Managing Groundwater Overdraft – Combining Crop and Water Decisions (without salinity)

by Yiqing “Gracie” Yao and Jay Lund California’s Central Valley produces much of the nation’s food, including about 40% of the country’s fruits and nuts and has the nation’s second most pumped aquifer system. Its drier southern portion, the San … Continue reading

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California’s Sacramento-San Joaquin Delta – a short history of big changes

by Jay Lund Deltas globally adjust with changes and fluctuations in external conditions, internal dynamics, and human management.  This is a short history of big changes to California’s Sacramento-San Joaquin Delta (Delta) in the past and present, and its anticipated … Continue reading

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Is California Heading for a Multi-Year Drought?

by Jay Lund Yes, California will have another multi-year drought.  California has immense hydrologic variability, with more droughts and floods per average year than any other part of the country.  California’s water users, managers, and regulators should always be prepared … Continue reading

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Functional Flows Can Improve Environmental Water Management in California

By Ted Grantham, Jeanette Howard, Belize Lane, Rob Lusardi, Sam Sandoval-Solis, Eric Stein, Sarah Yarnell and Julie Zimmerman Over the past three years, a team of scientists from universities, NGOs, and state agencies across California have been working to provide … Continue reading

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