Data for Calculating Efficient Outdoor Water Uses

December 6, 2023 (Final DWR Data)

The 2018 Legislation required DWR to provide or otherwise identify data regarding the unique local conditions to support the calculation of an urban water use objective (CWC 10609. (b)(2) (C)). The urban water use objective (UWUO) is an estimate of aggregate efficient water use for the previous year based on adopted water use efficiency standards and local service area characteristics for that year.

UWUO is calculated as the sum of efficient indoor residential water use, efficient outdoor residential water use, efficient outdoor irrigation of landscape areas with dedicated irrigation meter for Commercial, Industrial, and Institutional (CII) water use, efficient water losses, and an estimated water use in accordance with variances, as appropriate. Details of urban water use objective calculations can be obtained from DWR’s Recommendations for Guidelines and Methodologies document (Recommendations for Guidelines and Methodologies for Calculating Urban Water Use Objective - https://water.ca.gov/-/media/DWR-Website/Web-Pages/Programs/Water-Use-And-Efficiency/2018-Water-Conservation-Legislation/Performance-Measures/UWUO_GM_WUES-DWR-2021-01B_COMPLETE.pdf).

The datasets provided in the links below enable urban retail water suppliers calculate efficient outdoor water uses (both residential and CII), agricultural variances, variances for significant uses of water for dust control for horse corals, and temporary provisions for water use for existing pools (as stated in Water Boards’ draft regulation). DWR will provide technical assistance for estimating the remaining UWUO components, as needed. Data for calculating outdoor water uses include:

• Reference evapotranspiration (ETo) – ETo is evaporation plant and soil surface plus transpiration through the leaves of standardized grass surfaces over which weather stations stand. Standardization of the surfaces is required because evapotranspiration (ET) depends on combinations of several factors, making it impractical to take measurements under all sets of conditions. Plant factors, known as crop coefficients (Kc) or landscape coefficients (KL), are used to convert ETo to actual water use by specific crop/plant. The ETo data that DWR provides to urban retail water suppliers for urban water use objective calculation purposes is derived from the California Irrigation Management Information System (CIMIS) program (https://cimis.water.ca.gov/). CIMIS is a network of over 150 automated weather stations throughout the state that measure weather data that are used to estimate ETo. CIMIS also provides daily maps of ETo at 2-km grid using the Spatial CIMIS modeling approach that couples satellite data with point measurements. The ETo data provided below for each urban retail water supplier is an area weighted average value from the Spatial CIMIS ETo.

• Effective precipitation (Peff) - Peff is the portion of total precipitation which becomes available for plant growth. Peff is affected by soil type, slope, land cover type, and intensity and duration of rainfall. DWR is using a soil water balance model, known as Cal-SIMETAW, to estimate daily Peff at 4-km grid and an area weighted average value is calculated at the service area level. Cal-SIMETAW is a model that was developed by UC Davis and DWR and it is widely used to quantify agricultural, and to some extent urban, water uses for the publication of DWR’s Water Plan Update. Peff from Cal-SIMETAW is capped at 25% of total precipitation to account for potential uncertainties in its estimation. Daily Peff at each grid point is aggregated to produce weighted average annual or seasonal Peff at the service area level. The total precipitation that Cal-SIMETAW uses to estimate Peff comes from the Parameter-elevation Relationships on Independent Slopes Model (PRISM), which is a climate mapping model developed by the PRISM Climate Group at Oregon State University.

• Residential Landscape Area Measurement (LAM) – The 2018 Legislation required DWR to provide each urban retail water supplier with data regarding the area of residential irrigable lands in a manner that can reasonably be applied to the standards (CWC 10609.6.(b)). DWR delivered the LAM data to all retail water suppliers, and a tabular summary of selected data types will be provided here. The data summary that is provided in this file contains irrigable-irrigated (II), irrigable-not-irrigated (INI), and not irrigable (NI) irrigation status classes, as well as horse corral areas (HCL_area), agricultural areas (Ag_area), and pool areas (Pool_area) for all retail suppliers.

Organization

California Department of Water Resources

DWR manages California's water resources, systems, and infrastructure, including the State Water Project (SWP), in a responsible, sustainable way.

License

Other (Public Domain)

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Data and Resources

Calendar Year Annual DataCSV
This file contains weighted average ETo, total precipitation, and Peff data...
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Calendar Year Annual Data (Excel format)XLSX
This file contains weighted average ETo, total precipitation, and Peff data...
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Fiscal Year Annual DataCSV
This file contains weighted average ETo, total precipitation, and Peff data...
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Fiscal Year Annual Data (Excel format)XLSX
This file contains weighted average ETo, total precipitation, and Peff data...
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Landscape Area Measurement FinalCSV
This is a summary table of II, INI, and NI irrigation status classes, as well...
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Landscape Area Measurement Final (Excel format)XLSX
This is a summary table of II, INI, and NI irrigation status classes, as well...
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Seasonal DataCSV
Seasonal ETo, Peff, and ETF data are provided for calculating agricultural...
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Seasonal Data (Excel format)XLSX
Seasonal ETo, Peff, and ETF data are provided for calculating agricultural...
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Additional Info

Field	Value
Contact Name	Water Use Efficiency Staff
Contact Email	[email protected]
Frequency	Irregular
Public Access Level	Public
Limitations	All information provided in this document is produced by the Department of Water Resources (DWR) pusuant to the legislative directive that required DWR to provide or otherwise identify data regarding the unique local conditions to support the calculation of an urban water use objective (CWC 10609. (b)(2)(C)). While the Department believes the information contained in this document to be reliable, human or mechanical error remains a possibility. Therefore, the Department does not guarantee the accuracy, completeness, timeliness, or correct sequencing of the information. Neither the Department of Water Resources nor any of the sources of the information shall be responsible for any errors or omissions, or for the use or results obtained from the use of this information. Some of the data contained in this document may also change over time as the Department of Water Resources makes adjustments based on further studies and investigation, as well as the feedback that it receives from interested parties.
Language	English
Temporal Coverage	Data ranges from calendar year 2018 to 2020 and is Urban Water Supplier dependent.
Spatial Coverage
Place Keywords	California
Bounding Coordinate	North Bounding Coordinate: 41.90432 East Bounding Coordinate: -114.08808 South Bounding Coordinate: 32.54913 West Bounding Coordinate: -125.25423
Last Updated	April 9, 2024, 21:02 (UTC)