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Estimates of Field Infiltration by Numerical Solution of the Moisture Flow Equation¹

ABSTRACT

The numerical procedure of Hanks and Bowers was used to solve the moisture flow equation for boundary conditions corresponding approximately to those existing for infiltration into a field soil. Water diffusivity and retention data, necessary for theory calculations of infiltration, were measured on field cores by the outflow method. Infiltration estimates were obtained for a simulated two-horizon soil with three nonuniform antecedent moisture profiles.

Calculated infiltration rates were in good agreement with field rates measured with a sprinkling infiltrometer. Although not considered a substitute for field measurement, the numerical procedure appears to be a useful means of supplementing field measurement data by providing estimates of infiltration for simulated conditions of practical interest which are difficult to evaluate in the field.

¹ Contribution from the Iowa Agr. and Home Econ. Exp. Sta., and the Soil and Water Conservation Research Division, ARS, USDA. Journal Paper No. J-4548 of the Iowa Agr. and Home Econ. Exp. Sta., Ames. Project No. 1356, supported in part by North Central Research Committee NC-40.

² Former Research Associate, Iowa Agr. and Home Econ. Exp. Sta., now Assistant Agronomist, Hawaii Agr. Exp. Sta., Maui; Soil Scientist, USDA, and Asst. Professor of Agronomy, Kansas State Univ., Manhattan; and Research Soil Scientist, USDA, and Professor of Soils, Iowa State Univ., Ames, respectively.

Received for publication April 8, 1963. Accepted for publication August 30, 1963.