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Downloads
Version 4.0 and 3.1
- Download and install BASINS Version 4.0
- Fact sheet about the BASINS 4.0 release (April 12, 2007)
- Download and install BASINS Version 3.1
- Latest updates (3.1 only)
- Data from the web
Latest updates
Both BASINS 4 and 3.1 have an automatic update feature in the software. There is no update for BASINS 4 at this time. The latest update for BASINS 3.1 is Update 8 
released November 2006. After successfully installing BASINS 3.1, download and install this update.
Data from the web
New and updated datasets (see metadata) have been added to the data download directory for each 8-digit watershed or HUC in the lower 48 states, Alaska (19), Hawaii (20), and Puerto Rico with the U.S. Virgin Islands (21). Data by HUCs can be found on the web. Use "Surf Your Watershed" to find and locate HUCs.
The DEM (Digital Elevation Model) shapefile and grid datasets can be added to BASINS before or after the BASINS project has been created.
The National Elevation Dataset (NED), a higher resolution elevation grid, tiled by HUC boundary is also available.
The GIRAS landuse/landcover has been removed from the core data and is now available seperately as a shapefile for each HUC.
Weather data by states for the models can be found at http://www.epa.gov/waterscience/ftp/basins/wdm_data/.
The SWAT model in BASINS requires STATSGO data.