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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
agricultural and biological sciences
Simple equation to estimate reference evapotranspiration from evaporation pans surrounded by fallow soil
Journal of Irrigation and Drainage Engineering, Volume 134, No. 4, Year 2008
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Description
Reliable estimates of reference evapotranspiration (ET0) are key elements for efficient water resource management, and estimating ET0, based on "Class 'A' pan evaporation" data is common in arid climates. A pan coefficient (Kp), which depends on the distance (or fetch) of green vegetation or fallow soil around the pan (F), wind run (U), and relative humidity (RH), is used to convert from pan evaporation to ET0. Several researchers have developed models for estimating Kp values for pans surrounded by green vegetated fetch, but there is only one equation to estimate Kp values for dry fetch conditions. The equation is complex, so the objective of this research was to develop a new simple equation to estimate Kp under fallow soil fetch conditions. The new Kp equation and the more complex equation were compared with tabular values published by the United Nations Food and Agriculture Organization. The new equation performed slightly better at matching the tabular Kp values than the complex equation. The equation derivation and evaluation are presented. © 2008 ASCE.
Authors & Co-Authors
Abd El-Wahed, Mohamed H.
Egypt, Fayoum
Faculty of Agriculture
Snyder, Richard
United States, Davis
University of California, Davis
Statistics
Citations: 2
Authors: 2
Affiliations: 2
Identifiers
Doi:
10.1061/(ASCE)0733-9437(2008)134:4(425)
ISSN:
07339437
Research Areas
Environmental
Food Security
Study Design
Case-Control Study