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Infiltration into Vertical Columns of Soil under a Small Positive Head¹

ABSTRACT

Experimentally measured soil moisture profiles during infiltration into vertical columns of air-dry Grenville silt loam, under a small positive hydrostatic pressure, were compared with those predicted by the iterative procedure of Philip, and by an explicit finite difference method. Philip's solution predicted the shape of the drier portion of the moisture profile satisfactorily but the predicted depth of the zone of zero soil moisture tension and the total depth of infiltration were less than found experimentally. Satisfactory estimates of the shape and depth of the moisture profile were provided by the second method when the high conductivities in the saturated and transition zones near the surface were taken into account.

¹ Contribution No. 101, Soil Research Institute, Canada Department of Agriculture, Ottawa, Ontario. Presented before Div. S-1 Soil Sci. Soc. Am. Nov. 18, 1963, at Denver, Colo. The help of K. M. Smillie and B. Attfield, formerly of Statistical Research Service, Ottawa, in programming for the IBM 1620 computer is gratefully acknowledged.

² Soil Physicists. Senior author is National Research Council Postdoctoral Fellow.

Received for publication March 13, 1964. Accepted for publication July 27, 1964.