TECHNICAL NOTES
Jun 1, 1983
Estimation of FAO Evapotranspiration Coefficients
Authors: Donald K. Frevert, M. ASCE, Robert W. Hill, and Bruce C. Braaten, Associate Members ASCEAuthor Affiliations
Publication: Journal of Irrigation and Drainage Engineering
Volume 109, Issue 2
Abstract
The estimation, by computers, of correction coefficients for the United Nations Food and Agriculture Organization (FAO) evapotranspiration computation method had required a ``table lookup'' process involving arrays of up to four dimensions. Since such arrays cannot be stored on many computer systems, an alternative approach to estimating the correction coefficients is desirable. This note presents one such approach which utilizes regression of climatic parameters to predict correction coefficients. Predictions obtained by this approach are compared to original coefficient values by use of a normalized error term. While problems have been experienced with certain intermediate values of the independent variables, the results obtained have been generally satisfactory.
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References
1.
Doorenbos, J., and Pruitt, W. O., “Crop Water Requirements,” FAO Irrigation and Drainage Paper No. 24, Rome, Italy, 1977.
2.
Nie, N. H., Hull, C. Hadlai, Jenkins, J. G., Steinbrenner, K., and Bent, D. H. Statistical Package for the Social Sciences, New York, N.Y., 1975.
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Copyright © 1983 ASCE.
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Published online: Jun 1, 1983
Published in print: Jun 1983
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Donald K. Frevert, M. ASCE
Hydr. Engr., Bureau of Reclamation, Engrg. and Research Center, Denver, Colo.
Robert W. Hill
Assoc. Prof., Agricultural and Irrigation Engrg. Dept., Utah State Univ., Logan, Utah
Bruce C. Braaten, Associate Members ASCE
Civ. Engr., Bureau of Reclamation, Engrg. and Research Center, Denver, Colo.
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