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Seepage into Stratified Water-Saturated Soil from Idealized Vertical Mulch Channels¹

ABSTRACT

A general theoretical method of approximating the steady-state, two-dimensional seepage rate in stratified porous media is applied to the problem of water flow into stratified water-saturated soil in the presence of idealized subsoil channels. The approximation, for the present problem estimated to be accurate within 10%, is obtained by considering the stratified system in 3 special, mathematically degenerate cases for which exact solutions are available. When a less permeable surface soil stratum overlies a more permeable stratum, the flow effect of the channels always exceeds that found for channels in a uniform soil and becomes quite marked if the channels penetrate the upper, less permeable stratum and extend into the more permeable stratum below. If the more permeable stratum overlies the less permeable stratum, the flow effect of the channels is less than in a uniform soil.

¹ Journal Paper No. 2225, Purdue Univ. Agr. Exp. Sta., Lafayette, Ind. Contribution from the Dept. of Agronomy. Presented before Div. I, Soil Science Society of America, Nov. 30, 1961, at St. Louis, Mo.

² Professor of Soils.

Received for publication October 11, 1963. Accepted for publication January 15, 1964.