Pan Evaporation and Evapotranspiration from Climatic Data

by Jerald E. Christiansen,

Serial Information: Journal of the Irrigation and Drainage Division, 1968, Vol. 94, Issue 2, Pg. 243-266

Document Type: Journal Paper


Pan evaporation data are useful in estimating losses from reservoirs and lakes, and for estimating evapotranspiration from agricultural crops using procedures relating evapotranspiration to pan evaporation. A formula, developed at Utah State University, is presented for estimating pan evaporation from extraterrestrial radiation and climatic data. This dimensionally sound formula utilizes climatic data of the type most readily available. It should provide reliable estimates of pan evaporation for a wide range of climatic conditions and latitudes. Tables are presented to simplify the application of the formula where electronic computers are not used. Three formulas for estimating evapotranspiration for several agricultural crops, using as the principal parameters either extraterrestrial radiation, pan evaporation, or measured incident radiation, together with climatic data, are also presented. These formulas, developed from more limited data, may not be as reliable for a wide range of climatic conditions and latitudes.

Subject Headings: Radiation | Evapotranspiration | Hydrologic data | Weather forecasting | Crops | Space exploration | Reservoirs | Lakes

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