ABSTRACT
In Ethiopia, one of the poorest countries in the world, soil erosion by water contributes significantly to the food insecurity of rural households and constitutes a real threat to sustainability of the existing subsistence agriculture. Surface run-off, sediment yield, soil moisture content, nutrient cycles, crop growth and management practices are simulated for each Hydrologic Response Units (HRUs), and aggregated for sub-basin by a weighted average. Necessary input data includes information about climatic and soil conditions, topography, and land use and land management. The sediment yield is estimated based on the lowest and highest sediment concentrations measured for the event. The difference in run-off between the Aba Kaloye and the Ayaye watershed is not significantly different. Under current land use and management soil and water assessment tool (SWAT) calculates a yearly run-off of 271 mm. Run-off and sediment measurements at the main outlet were used to calibrate the simulation model.
