Soil Erosion, Sediment Yield, and Runoff Modeling of the Megech Watershed Using the GeoWEPP Model

Modeling soil erosion, sediment yield, and runoff are crucial for managing reservoir capacity, water quality, watershed productivity. However, the monitoring modeling of erosion sedimentation rates in developing countries such as Ethiopia is not well practiced; thus, capacity diminishing at faster rates. In this study, Megech watershed, Upper Blue Nile Basin, were modeled using physically-based geospatial interface, Water Erosion Prediction Project (GeoWEPP). The GoWEPP model was calibrated validated Angereb sub-watershed simulated to representative sites capture spatiotemporal variability yield watershed. parameter sensitivity analysis showed that hydraulic conductivity (Ke) all types found be dominant simulation, while rill erodibility (Kr), (Ke), critical shear stress (τc), inter (Ki) sensitive loss simulation. calibration (2000–2002) validation (2003–2004) results capability GeoWEPP model; with R2 NSE values, respectively, 0.94 calibration; 0.75 0.65 validation. general, show study varied between 10.3 t/ha/year 54.8 t/ha/year, a weighted mean value 28.57 t/ha/year. resulted higher over design basin, suggesting implementation best management practices reduce yield. Moreover, rate Angerb 32.69