title: Soil and Water Assessment Tool
text: # Soil and Water Assessment Tool
  
  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
  