Application of SWAT model to investigate nitrate leaching in Hamadan-Bahar Watershed, Iran

▶ We used the Soil and Water Assessment Tool (SWAT) to build a hydrologic model for the Hamadan-Bahar watershed in western Iran. The watershed suffers from an increasing water pollution problem due to agricultural activities. ▶ The hydrology model was calibrated, and validated with uncertainty analysis. ▶ We used the calibrated hydrology model and further calibrate it for nitrate leaching and crop yield, using wheat and potato. ▶ We characterized the spatial and temporal leaching pattern. ▶ In a follow up work we will suggest a best management practice for the region.