Erosion Estimation in Ungauged Basins by Using the Integrating Model Technique

The aim of this research is to estimate the sediment yield of ungauged basins by using the integrating model technique. A Geographical Information System (GIS), coupled with the Universal Soil Loss Equation (USLE) model by applying spatial program with advanced language programming (Visual Basic 6), is used to facilitate database development, manipulation, and output display. The 403 km2 watershed is divided into 200 x 200 m grid cells, and gross soil erosion for each cell is first predicted by the USLE model. The Arc/Info GIS utilities are used to calculate the total mass of sediment moving from each cell to the nearest stream network. In addition, a watershed of (36) effective rainstorms is simulated; the sediment yield ranges between (16 and1908 tons) for rainfall ranging between (15.5 and 79.9) mm; the results have demonstrated that the eroded sediment yield is closely related to rainfall .