Brief Report
Sep 1982
Estimating Potential Evapotranspiration
Publication: Journal of the Irrigation and Drainage Division
Volume 108, Issue 3
Abstract
Increasing population and needs for an augmented food supply give greater importance to improved procedures for estimating agricultural water requirements both for irrigation and for rain-fed agriculture. Four methods for estimating potential evapotranspiration are compared and evaluated. These are the Class A evaporation pan located in an irrigated pasture area, the Hargreaves equation, the Jensen-Haise eguation, and the Blaney-Criddle method. The evaporation pan is rated as superior to the other methods. However, the difference in reliability between the pan and the Hargreaves method are not considered to be very significant. Both the Jensen-Haise and the Hargreaves methods require either measured or estimated solar radiation. Methods are presented for estimating solar radiation from the difference between maximum and minimum temperature, from the percentage of possible sunshine, and from relative humidity. These procedures have some limitations, but provide improved reliability and make the estimates more universal.
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Information
Published In
Journal of the Irrigation and Drainage Division
Volume 108 • Issue 3 • September 1982
Pages: 225 - 230
Copyright
© 1982 American Society of Civil Engineers.
History
Published in print: Sep 1982
Published online: Feb 11, 2021
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Authors
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George H. Hargreaves, F.ASCE
Research Dir., Dept. of Agr. and Irrigation Engrg., Utah State Univ., Logan, Utah
Zohrab A. Samani
Ph.D. Candidate, Dept. of Agr. and Irrigation Engrg., Utah State Univ., Logan, Utah
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ASCE Library Cards let you download journal articles, proceedings papers, and available book chapters across the entire ASCE Library platform. ASCE Library Cards remain active for 24 months or until all downloads are used. Note: This content will be debited as one download at time of checkout.
Terms of Use: ASCE Library Cards are for individual, personal use only. Reselling, republishing, or forwarding the materials to libraries or reading rooms is prohibited.
Terms of Use: ASCE Library Cards are for individual, personal use only. Reselling, republishing, or forwarding the materials to libraries or reading rooms is prohibited.