SWAT stands for Soil and Water Assessment Tool. It was developed by United States Department of Agriculture. Notable fact is that SWAT is a public domain software. SWAT is available as a GUI extension for ArcGIS in the form of ArcSWAT. ArcGIS is a leading GIS software developed by ESRI®. ArcSWAT can be used for watershed simulation and modelling. SWAT is accepted worldwide in a big way. This is evident from the large number of scientific papers published and international conferences held every year. For a successful simulation the designation of physical parameters like land use, soil, weather, water use management, and chemical parameters like water quality data along with the simulation period becomes necessary. Watersheds are divided into subbasins first and then into hydrological response units or HRUs.
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