Abstract
ABSTRACT THE performance of a simplified process (SP) model for water and sediment yield from single storms was analyzed and compared to USLE performance using rainfall simulator and natural rainfall plot data. SP and USLE provided soil loss estimates with approximately equal accuracy on the rainfall simulator plots. Neither method was able to predict the extremely high soil losses which occurred on one of the sandy soil treatments. On steep slopes, the SP model performed much better than the USLE. The superiority of SP estimates for the steep slope plots was probably a result of distinct differences in the formulation of the two methods. Optimization of SP infiltration parameters generally improved both runoff and soil loss estimates. This underscores the importance of site-specific infiltrometer data in the estimation of infiltration parameter values.
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