The application of mathematical models to simulate and prioritize sensitive formations in semi-arid climate

Research on methods of soil and water resources management requires technic that can and cannot be remotsensing prediction, and understanding the complex and dynamic processes and provides. Neitsch et al. (2005), stating that the model swat predicting the effects of  on the creation of management activities and the amount of sediment in the basin scale, with a variety of soils, land use and management conditions in long time interval is developed. Research inducted inside and outside Iran shows that Simulation run off and sediment on the watershed large and small with use of swat model is more efficient