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Assessment of Surface Runoff and Sediment Yield using WEPP Model
The WEPP model is used to estimate the runoff and sediment yield at the outlet of the watershed. The WEPP model is used because of the hilly nature of the watershed. The slope of the watershed varies from 0 to 30%. The runoff and sediment yield at the downstream end is determined by the process of rainfall and runoff erosivity, sediment detachment, transport, and deposition in overland flow. Overland flow processes are usually conceptualized as a mixture of broad sheet flow (called interrill flow) and concentrated flow (called rill flow). Most often the two flow types are lumped and described as overland flow with computations based on a broad sheet flow assumption. Interrill erodibility and effective hydraulic conductivity were the calibration parameters for the WEPP model. The model calibration and validation has been done by comparing predicted monthly sediment yield and runoff data with observed one. The model predicted the runoff and sediment yield with highest R2 as 0.953 and 0.911 respectively. The model validation showed closer prediction of runoff and sediment yield with respective R2 as 0.94 and 0.722 respectively.
Keywords
WEPP, Runoff Erosivity, Overland Flow, Effective Hydraulic Conductivity.
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