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Simple Hydrologic Modeling

by George H. Hargreaves, Utah State Univ, Int Irrigation, Cent, Logan, UT, USA,
Kenneth John Vogler, Utah State Univ, Int Irrigation, Cent, Logan, UT, USA,



Document Type: Proceeding Paper

Part of: Water for Resource Development

Abstract:

Several simple models for estimating precipitation and evapotranspiration from a limited data base are discussed. Rainfall probabilities may be calculated from mean monthly rainfall. Depth-duration-frequencies are related to the fourth root of the duration times the return period. Evapotranspiration may be estimated from temperature. Area-discharge relationships and estimation of mass rainfall and mass discharge plottings can illuminate characteristics of stream flow behavior. Hydrologic considerations are incomplete in themselves and should be integrated with energy and soil factors to provide a whole vehicle for agricultural technology transfer.

Subject Headings: Hydrologic models | Rainfall | Evapotranspiration | Water discharge | Streamflow | Water resources | Soil water

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