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Influence of Variations in the Diffusivity-Water Content Relation on Infiltration¹

ABSTRACT

Estimates of the influence of variations in the diffusivity (or conductivity)-water content relation on infiltration were made using a numerical method. Where the diffusivity was increased or decreased up to a factor of two at saturation, infiltration was markedly changed. However, variations of the diffusivity by a factor of 100 at drier moisture contents had no significant influence on infiltration. This implies that infiltration is governed, to a large extent, by the soil properties at water contents near saturation and is little influenced by soil properties at drier water contents.

¹ Contribution from the Soil and Water Conservation Research Division, ARS, USDA, in cooperation with the Kansas Agr. Exp. Sta. Contribution No. 789, Department of Agronomy, Kansas Agr. Exp. Sta., Manhattan. Supported in part by North Central States Regional Committee NC-40.

² Soil Scientists (Physics), USDA, Manhattan, Kans.

Received for publication June 15, 1962. Accepted for publication January 21, 1963.