Abstract
A computer program was written to solve Richards model for flow in an unsaturated soil. Finite element analysis was used for the numerical solution and a velocity permeameter defined one boundary condition. The program allows for different soil types, some soil anisotropy, and different velocity permeameter equipment configurations. Changes in soil water pressure head with time under the velocity permeameter are calculated. The shape and extent of the wetting and saturated fronts can be determined from the soil water pressure head values. Initial soil pressure heads of 10, 20, 50, and 100 m were studied. A linear relationship between the radial and vertical hydraulic conductivity, K, was also examined. The relationship between soil water pressure head and K were modeled for a Pachappa sandy loam, an Indio loam, and a Chino clay soil.
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