Approximately every 10 years, a one-page irrigation survey form is mailed out to California growers to update records on irrigation system methods. A statewide survey of current irrigation methods was conducted during 2011 to determine which irrigation methods were used in California during 2010. The 1991, 2001, and 2010 studies were conducted by mailing questionnaires to growers who were randomly selected from a list of growers. A list of approximately 58,000 growers in California, from the California Department of Food and Agriculture (CDFA) was used to determine the mailing list. All rice-only, non-irrigation, and livestock-only growers were excluded from the list. Growers were asked to state the main county in which they farmed and the acreages they had planted during 2001 and 2010 to each of 20 possible crop categories by irrigation method within that county.
- 1991, 2001, and 2010 Statewide Irrigation Methods Survey Data - [20MB XLS]
- 2001 Statewide Irrigation Survey - Technical Notes - [156 KB PDF]
- 2010 Statewide Irrigation Survey - Technical Notes - [184 KB PDF]