Climate Change Impacts on Water Supply and Agricultural Water Management in California's Western San Joaquin Valley, and Potential Adaptation Strategies



Scripps Institution of Oceanography, University of California, San Diego, University of California, Berkeley




This study modeled future impacts on water supply and demand for various climate change scenarios. The modeling tool, the Water Evaluation and Planning (WEAP) system, was developed specifically for the Sacramento River basin and Delta export region of the San Joaquin Valley. WEAP is an integrated rainfall/runoff, water resources systems modeling framework that can be forced directly from time series of climatic input to estimate water supplies (watershed runoff) and demands (crop evapotranspiration). WEAP also assessed the impacts of adaptation strategies used in agricultural management –including irrigation technology and cropping patterns. The study indicated that these adaptation strategies may ease the stress on the Sacramento and San Joaquin Valley’s water systems. This is a state-funded research study sponsored by the California Energy Commission, Environmental Protection Agency, and Department of Water Resources. (CEC, CalEPA, DWR).

Climate Impact Tags

Drought Sea level rise Temperature

Adaptation Planning Guide Phases

Phase 2: Assess Vulnerability Phase 3: Define Adaptation Framework and Strategies

Resource Type Tags

Data and tools Scientific study


Extent: Contra Costa County, Merced County, Sacramento County, San Benito County, San Joaquin County, Santa Clara County, Stanislaus County, Tulare County, Yolo County


Last updated: May 31, 2023