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Modeling Runoff and Sediment Yield from a Terraced Watershed Using WEPP

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

Citation:  Paper number  MC08118,  2005 Special Meeting Papers. (doi: 10.13031/2013.24472) @2008
Authors:   Mary Carla McCullough, Dean E Eisenhauer, Michael G Dosskey
Keywords:   WEPP, runoff, sediment yield, soil erosion, terraced, conservation terraces

The watershed version of WEPP (Water Erosion Prediction Project) was used to estimate 50-year runoff and sediment yields for a 291 ha watershed in eastern Nebraska that is 90% terraced and which has no historical gage data. The watershed has a complex matrix of elements, including terraced and non-terraced subwatersheds, multiple combinations of soils and land management, a grassed-waterway network, and natural stream channels leading to the outlet. The objectives of this study were to model the study watershed using WEPP and to evaluate model results compared to literature values. WEPP estimated the sediment yield to be 1.9 T/ha/yr, the sediment delivery ratio to be 0.22 and the percent of sediment contribution from the main channel to be 31% of the total sediment yield. These results are consistent with values reported in the literature.

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