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Goodness of Fit for Eight Water Infiltration Models¹

ABSTRACT

Eight infiltration models were investigated for their capability to describe water infiltration into soils. The models were; Philip's, Modified Philip's, Kostiakov's, Talsma and Parlange's, Horton's, and Lewis and Milne's. Field measurements of water infiltration were made using single ring infiltrometers on field plots established on a Norwood soil (Typic Udifluvents) with four long-term (27 yr) winter cover crop treatments followed by cotton (Gossypium hirsutum L.) each year. The four treatments were; (i) common vetch (Vicia sativa), (ii) wheat (Triticum aestivum L.) + 60 kg/ha N; (iii) 60 kg/ha N, and (iv) check (no fertilizer or winter cover). Measured infiltration rates for the winter cover treatments were significantly higher than for the check plots. With the exception of Lewis and Milne's, all models showed good agreement with measured infiltration. Model parameters obtained by best fit of measured data, were significantly different among the winter cover treatments. Based on R² values, Horton, Kostiakov and Philip equations provided best predictions over all other models. Soil bulk density and saturated hydraulic conductivity for two soil depths were not affected by the winter cover treatments.

¹ Contribution from Agronomy Dep., Louisiana Agric. Exp. Stn., Louisiana State Univ. Agric. Center, Baton Rouge, LA 70803.

² Instructor and Professor of Soil Physics, respectively.

Received for publication December 5, 1984.