Defersha - Fukhrudin Khalif and Mengistu B 1Department of...

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The hillslope version of the WEPP model with its windows-based graphical interface was used. In order to run the model, climate, topography, soil and land use data were prepared using GIS and the input data organized as per the model input requirements and the model was run at hillslope level. In this approach the assumption was that the streams are not transport limited. For each hillslope, the required model inputs were prepared and the WEPP hillslope model was run for each delineated hillslope. The result for each hillslope was transferred to GIS and the soil loss map, sediment yield map and runoff map were generated. Data Inputs A 2007 USDA-NRCS Crop Data Layer produced from Indian Remote Sensing RESOURCESAT-1 (IRS-P6) Advanced Wide Field Sensor (AWiFS) and a Minnesota STATSGO soil map were used as the crop cover and soil type inputs for the model. A DEM was used to generate a slope (% steepness) map and to delineate the sub- watersheds and stream network for hillslope definition. The model development is based on the fundamentals of the modified Green and Apt infiltration theories, plant science, open-channel and impoundment hydraulics, and erosion mechanics. WEPP routes overland flow and sediment through hillslopes and
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