Accuracy of Estimated Reference Crop Evapotranspiration
Publication: Journal of Irrigation and Drainage Engineering
Volume 115, Issue 6
Abstract
Evapotranspiration from cool‐season grasses is used as the reference for . The requirements for local calibration for three equations for recommended by the Food and Agriculture Organization of the United Nations (FAO) are shown for different climatic regions of California. Data from measured coolseason‐grass evapotranspiration and Class A pan evaporation from sites located in large well‐watered, irrigated grass pastures in three distinct climatic conditions are used to evaluate a method for estimating that requires only measured values of maximum and minimum air temperatures. Mean temperature, minimum relative humidity, and solar radiation can all be estimated from maximum and minimum air temperatures. The equation for that requires only temperature measurements may seem to be quite simple, but it is in reality a very comprehensive procedure incorporating most of the climatic interactions that influence the evaporative potential. The analysis of data from four lysimeter and Class A pan sites in California indicates that the temperature‐range equation estimates reasonably well in a large diversity of climates. The corrected Penman and other equations recommended by FAO are shown to usually overestimate in various climatic regions of California.
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Information & Authors
Information
Published In
Journal of Irrigation and Drainage Engineering
Volume 115 • Issue 6 • December 1989
Pages: 1000 - 1007
Copyright
Copyright © 1989 ASCE.
History
Published online: Dec 1, 1989
Published in print: Dec 1989
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