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Scaling Soil Water Properties and Infiltration Modeling¹

ABSTRACT

We examined variability and interrelation of the scaling factors for Green-Ampt infiltration parameters of saturated hydraulic conductivity (K_s) and wetting-front pressure head (h_f) in a 9.6-ha grassland watershed, containing three hydrologically similar silt loam Mollisols. Scaling factors for different depths at a given site appeared to be related. The scaled mean K_s decreased with depth, while the scale mean h_f showed no trend. The K_s scaling factors had greater variability between sites than the h_f factors, and the relationship between the two sets of factors deviated appreciably from a 1:1 line. However, there was a linear relationship between them, which was utilized in modeling infiltration. The composite infiltration for the watershed calculated by using different, but related, scaling factors for K_s and h_f was very close to that obtained by using the same scaling factors, derived from either K_s or h_f, for both. However, the distribution and range of the predicted infiltrations were greatly different.

¹ Contribution of the Water Quality and Watershed Research Laboratory, USDA-ARS, Durant, OK 74702, and Dep. of Land, Air, and Water Resources, Univ. of California, Davis, CA 95616.

² Soil Scientist (Physics), Geologist, and Professor of Soil and Water Sciences, respectively.

Received for publication February 17, 1984. Accepted for publication April 30, 1984.

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