Abstract

Evaporation from laboratory soil columns was studied as a function of potential evaporative conditions. The length of time a given evaporation rate could be maintained by the soil was in good agreement with an approximate solution of the isothermal equation for unsaturated flow. During the falling-rate period of drying, the evaporation rate was found to approach very nearly a function of the water content of the soil and to be nearly independent of the potential evaporation rate. The cumulative evaporation at any time can be calculated from the flow equation. Temporary interruption of the evaporative process had little effect upon the cumulative evaporation over a long period of time.

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