Evapotranspiration Data Management in California

by R. L. Snyder, Univ of California, Davis, United States,
W. O. Pruitt, Univ of California, Davis, United States,

Document Type: Proceeding Paper

Part of: Irrigation and Drainage: Saving a Threatened Resource?In Search of Solutions


This paper will discuss components of the California Irrigation Management Information System (CIMIS). CIMIS is an automated agricultural weather network operated by the California Department of Water Resources to disseminate evapotranspiration (ET) information to farmers for use in irrigation scheduling. Electronic weather stations and telephone data transfer to a central computer are used to gather hourly weather data and estimate reference evapotranspiration (ETo), using a modified Penman type equation. Currently, there are approximately 80 weather stations and they provide ETo data for most of the irrigated land in California. Weather and ET0 data are disseminated to the public through a computer dial-up service. Data error checking, calculation of ETo, and data archival will be discussed.

Subject Headings: Information management | Systems management | Irrigation systems | Information systems | Hydrologic data | Evapotranspiration | Weather forecasting | California | United States

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