LAUSR

Abstract Water erosion poses a threat to agricultural land and water resources, and they are at risk of lower crop yields, soil loss, and reservoir sedimentation. Against this backdrop, the soil and water assessment tool (SWAT) model was used to assess the effects of ridging across and along the slope on sediment yield in the Chanchaga basin. The basin parameters were edited on the SWAT model to suit each location. With NSE of 0.56 and R2 of 0.56 for monthly sediment yields across the slope ridging, reflect the observed values for validation. The estimated monthly sediment depositions stand for the measured data in the ridging along the slope, with NSE of 0.56 and R2 of 0.60, respectively. In the Shatta sub-basin, the findings followed the same pattern. The model has been identifying runoff curve number (CN2), soil water storage capacity (SOL_ AWC), and erosion (USLE) since they changed simulated sediment yield. Across- the slope ridging also reduced sediment yield by 32% (9.35 t/ha/yr), but along -the slope ridging has increased sediment yield by 68% (20.32 t/ha/yr). Ridging along the slope should be discouraged in the Chanchaga basin.