Effect of Watershed Discretization of SWAT model on Streamflow Estimationin Sedone River

Abstract

This paper showed the result of the effect of watershed discretization on streamflow estimation in Sedone River, drainage area of 7,219 Km² by using Soil and Water assessment Tool (SWAT). Sedone basin has different level of terrain as the lowest level of 100 meters to the highest of 2,500 meters. The average of annual rainfall is 1,800 millimeters in the lowland and 3,500 millimeters in highland situated within the same river basin. The data for model included land use, soil, climate and the. Watershed discretization into 160 sub-basins by 2,500 thresholds is better represent of the hydrological processes and a good estimate of simulated values which had a better model efficiency while comparing with observed values. This paper reveals the SWAT model is effective to predict hydrological status and also uses as a tool to analyze hydrological process in order to plan for water resource management in Sedone river basin.