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Published in Soil Sci Soc Am J 36:402-407 (1972)
© 1972 Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Seepage Through Soil Bedding or a Hillside Due to a Steady Rainfall: I. Soil Surface of Constant Slope1

M. Sami Selim and Don Kirkham2

ABSTRACT

A theoretical solution for the seepage of steady rainfall through soil bedding (a series of formed parallel mounds and depressions, or furrows used in land drainage when soil overlies an impermeable layer) is given. The solution considers a finite depth of water in the bedding depression or furrow. The geometry on an extended scale can be considered as that of a hillside with water seeping to a river, or, on a small scale, as that of the side of a water-saturated ridge-furrow combination in a row-crop field. The solution of the problem offers a mechanism as to how soluble chemicals below the soil surface may get into overland flow. The mechanism is: the rainfall enters the soil, moves downslope in the soil and then moves upward out of the soil, carrying soluble chemicals, such as fertilizers, insecticides, etc. This upward moving soil solution merges into surface runoff.

NOTES

1 Journal Paper J-6995 of the Iowa Agr. & Home Econ. Exp. Sta., Ames, Iowa 50010. Project 1888. Research supported in part by National Science Foundation Grant no. GK 4012. Also supported in part by the US Dep. of the Interior, Office of Water Resources Research under P.L. 88-379 through Project B-019-IA.

2 Postdoctoral Fellow and Professor of Agronomy, respectively, Iowa State University of Science & Technology, Ames.

Received for publication August 16, 1971. Accepted for publication January 7, 1972.






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