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The Prediction of Evaporation, Drainage, and Soil Water Storage for a Bare Soil¹

ABSTRACT

Evaporation, drainage, and changes in storage for a bare Plainfield sand were measured with a lysimeter during June, July, and August 1967, under natural rainfall conditions. Cumulative evaporation at any stage was proportional to the square root of time following each heavy rainfall. The drainage rate was found to be an exponential function of water storage. Both relations can be predicted from flow theory with knowledge of soil capillary conductivity, diffusivity, and moisture retention characteristics. Using these two relations and daily rainfall data, the water storage in the top 150 cm was predicted over the season to within 0.3 cm.

¹ Contribution of the Department of Soil and Water Sciences, University of Wisconsin, Madison. Published with the permission of the Director of the University of Wisconsin Agr. Exp. Sta. This work was supported in part by USDA Hatch Funds and by Green Giant Co.

² Research Assistant, Professor, and Assistant Professor.

Received for publication January 8, 1969. Accepted for publication April 17, 1969.

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