Soil and Water Assessment Tool
Introduction '''Soil and Water Assessment Tool''' (SWAT) is a free and open source hydrology model and GIS computer simulation sponsored by the USDA.SWAT is a well known geographic hydrological model in use by many universities and government agencies around the world, and integrates with commercial products like ArcGIS.
Some users of SWAT *The River Systems Research Group of the Department of Oceanography at the University of Washington*The Hydro and Agro Informatics Institute under the Ministry of Science and Technology of the Royal Thai Government*The Departments of Agricultural & Biological Engineering and Civil & Environmental Engineering at Purdue University
References
External links *  Water Quality Model Passes Another Test (SWAT)* http://www.brc.tamus.edu/swat/