Land & Water Use
The Land and Water Use Program collects land-use data and develops water-use estimates for a variety of statewide water planning efforts, including:
- California Water Plan
- Evaluation of water-use efficiency measures
- Future water-use projections
- Groundwater model development
- Water transfers
We conduct surveys of agricultural, urban, and environmental land uses; collect weather and other data required to make crop and landscape water-use estimates; and develop annual estimates of land and water uses on a regional basis.
We provide the following services and tools to internal DWR programs and to other users:
- Land and water use data including land use surveys, public water systems statistics surveys, and statewide irrigation methods surveys
- Agricultural land and water use estimates of irrigated crop acreages, crop evapotranspiration (ETc), effective precipitation (Ep), evapotranspiration of applied water (ETaw), and applied water (AW) for 20 crop categories for each year for study areas within each county
- Agricultural Water Use Models, such as Consumptive Use Program PLUS (CUP+), Simulation of Evapotranspiration of Applied Water (SIMETAW), and California Simulation of Evapotranspiration of Applied Water, developed in collaboration with the University of California, Davis (Cal-SIMETAW)
- California Seasonal Application Efficiency Program, developed in partnership with the University of California, Davis, assesses how efficiently water is applied on irrigated land
Publications & Reports
Refinement of Rice Water Consumptive Use During the Growing Season Report Fact Sheet
Two studies estimating the consumptive water use of rice during the growing season in the Sacramento Valley were recently completed by the Department of Water Resources. The purpose of these studies is to evaluate and refine rice water consumptive use during the growing season in the Sacramento Valley for the most common paddy rice variety grown in the Sacramento Valley. The reports were peer reviewed by leading experts and initial study results were published in Journal of Irrigation and Drainage Engineering, © ASCE, ISSN 0733-9437. Copies of the Rice Water Use reports can be viewed at the links below.
- Rice Water Use Phase I Report
- Rice Water Use Phase II Report
California Simulation of Evapotranspiration of Applied Water and Agricultural Energy Use in California
Science article on the Cal-SIMETAW model, which was designed to estimate daily soil-water balance to determine ETc, ETaw, and AW for 20 crop categories by combinations of detailed analysis unit and county (DAU/county) for use in the California Water Plan Update.
Consumptive Use Program Plus
Science article on CUP+, which was developed to help growers and water agencies determine ETc and ETaw for a study area.
- Consumptive Use Program Plus Users Guide
- Consumptive Use Program Plus Data
Simulation of Evapotranspiration of Applied Water
Science article on the SIMETAW program, which was developed to help water planners and researchers improve their long-term estimates of net crop-water requirements.
Land and Water Use Study Areas —Interactive GIS map of critically overdrafted groundwater basins, detailed analysis unit boundaries, and other boundaries.