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United States Department of Agriculture

Agricultural Research Service

Ground-Water Recharge (GWR) and Actual Evapotranspiration (AET) Estimations
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GWR and AET are difficult to estimate because of lack of data and knowledge of watershed processes. A simple method, previously unknown in the English literature called the Glugla method, was tested using the NAEW lysimeter data. The Glugla method estimates long-term average annual AET, and long-term average annually GWR is computed using the water-balance equation. The Glugla method requires estimates of long-term average annual precipitation, potential evaporation, runoff, and crop yield, and a soil parameter(% of particles < 0.02 mm). Glugla estimates of AET and GWR can be spatially determined for regional estimates. The method was shown to work well with NAEW data, but more study is required. Other research has shown that the method can be used to estimate long-term monthly AET and GWR.

Last Modified: 10/14/2005
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