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Prediction of Evaporation from Homogeneous Soil Based on the Flow Equation¹

ABSTRACT

Evaporation of water from columns packed with McGrew loamy sand was measured for three different sequences of six water additions and evaporation times totaling 60 days. These treatments were: (1) equal amounts of water added and equal times evaporated, (2) equal amounts applied and varied evaporation times, and (3) various amounts applied and equal evaporation times. The average times and amounts were the same in all treatments, and the total losses were approximately the same. A solution for the diffusivity equation for soils of finite depth was used to predict the cumulative water loss for all the treatments event by event and by an averaging technique. The predicted amounts were all within 6.5% of the total cumulative evaporation.

¹ Contribution from the Agricultural Research Service, USDA, in cooperation with Colorado State Univ. Exp. Sta. Scientific Journal Series 1778.

² Soil Scientist, USDA, Fort Collins, Colorado.

Received for publication November 21, 1972. Accepted for publication April 2, 1973.