BASINS
WWQTCS Info
The current release is BASINS 4. This is an open source, freely distributable GIS tool for watershed analysis and monitoring. BASINS 3.1 continues to be supported until mid-2008. A BASINS User's Manual, system files, documentation, tutorial, and data by 8-digit HUC Watershed are available on the Web Download page.
Tech Support Center fact sheet (PDF, 2 pp., 733 KB, about PDF)
TMDL fact sheet (PDF, 2 pp., 697 KB, about PDF)