The HEC-ResSim Documentation Page is the most comprehensive source of documentation on HEC-ResSim. The page contains links to the Release Notes, User Manuals, Tutorials and Guides and Training Materials.

User's Manual

Version 4.0, October 2025
Water Quality in Version 4.0, October 2025
Version 3.5, September 2024
Version 3.3, February 2021
Version 3.1, December 2013
Version 3.0, April 2007
Version 2.0, September 2003

Quick Start Guide

Version 3.3, February 2021
Version 3.1, December 2013
Version 3.0, April 2007
Version 2.0, September 2003

In addtion to the above documents, the following documents will provide the user with further information on HEC-ResSim:

Technical Notes

Version 3.3, February 2021
Version 3.1, December 2013

Release Notes

Version 4.0, October 2025
Version 3.5, September 2024
Version 3.3, February 2021
Version 3.1, December 2013
Version 3.0, April 2007
Version 2.0, September 2003

Extras

Training
Tutorials and Guides
How to backup HEC-ResSim Watersheds
Cleaning up an HEC-ResSim Watershed