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THE WEPP WATERSHED MODEL: III. COMPARISONS TO MEASURED DATA FROM SMALL WATERSHEDS

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan www.asabe.org

Citation:  Transactions of the ASAE. VOL. 40(4):945-952. (doi: 10.13031/2013.21345) @1997
Authors:   B. Y. Liu, M. A. Nearing, C. Baffaut, J. C. Ascough II
Keywords:   Hydrology, Modeling, Runoff, Soil erosion, Watersheds, WEPP

The Water Erosion Prediction Project (WEPP) watershed scale model was developed by the USDA for purposes of erosion assessment and conservation planning. The purpose of this study was to evaluate the WEPP watershed model applicability and prediction accuracy for small watersheds (0.34-5.14 ha) under different climate, topography, soil, and management regimes. No calibration was conducted to obtain the results. Only default model parameters were used. Data from 15 watersheds in six U.S. locations were compared to runoff and sediment yield estimates using WEPP95. The r2 values between measured and predicted total runoff and sediment yield for the 15 watersheds were 0.86 and 0.91, respectively. The r2 between measured and predicted event data for individual watersheds ranged from 0.01 to 0.85 for runoff and from 0.02 to 0.90 for sediment. Cumulative frequency distributions for predicted values of event runoff and sediment matched those for measured values with some exceptions. Improvements in the WEPP model are suggested where limitations were observed.

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