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California Crop and Soil Evapotranspiration

Date:	2003
Location:	California
Sponsors:	CALFED, DWR, and USBR
Reports Available:	ITRC Report No. 03-001
Online Data:	Online Evapotranspiration Data

 

The purpose of this study was to create a publication presenting evapotranspiration for crops and soils in 13 California Dept. of Water Resources (DWR) Reference Evaporation Zones (ETo Zones) for three types of precipitation years:

• typical
• wet
• dry

 

For persons interested in irrigation scheduling and design, the publication includes instructions on how to adjust ET values for:

1. different irrigation systems
2. different growing seasons

 

It also includes instructions, for persons doing regional or irrigation district water balances, on how to adjust values for:

1. bare spots and decreased plant vigor
2. multiple crops on the same field

 

One of the main purposes of this project was to provide California water users with crop/soil ET values that take into account regional environmental and management differences.  Furthermore, with the ETo and crop/soil ET information presented in each table, crop coefficients can be calculated with relative ease for regions throughout the state.

The resultant publication, ITRC Report No. 03-001, contains the most comprehensive crop/soil ET values available to date for California.  The data can also be accessed on the ITRC website's Online Evapotranspiration Data section.