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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.

• 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

• Water Quality Model Passes Another Test (SWAT)
• http://www.brc.tamus.edu/swat/