Abstract

ABSTRACT INFILTRATION from constant application rates as predicted by the Holtan model and the Green-Ampt model as modified by Mein and Larson (GAML model) was compared to values determined experimentally. The Holtan model parameters were evaluated by fitting. The Campbell method was used to determine unsaturated conductivities for use in evaluating the Sav parameter for the GAML model. Both models did a good job of predic-ting infiltration during the latter and middle portions of the experimental runs. The GAML model did a good job of predicting time to start of run-off, while the Holtan equation generally failed to predict the delay in ponding.

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