Abstract
ABSTRACT A digital computer model was developed to simulate the moisture balance on an agricultural watershed, including interception, infiltration, surface-depression storage, surface runoff, soil moisture redistribution, deep percolation, and evapotranspira-tion. The model is for small homogeneous watersheds on deep, well-drained soils, and was calibrated and tested using data from small research watersheds operated in the deep loess hills in western Iowa. The model produced continuous simulation of the moisture balance during the growing season. The correla-tion between measured and predicted surface runoff depths for individual events during 4 yr of records was 0.80. The correlation between predicted soil moisture in the root zone and bi-weekly measurements during the same 4 yr was 0,91.
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