(Hydrologic Engineering Center's River Analysis System) is the industry standard for modeling river hydraulics. While it originated as a 1D modeling tool, its powerful 2D modeling capabilities —including dam break analysis, floodplain mapping, and complex urban drainage—have made it indispensable for modern engineers.
To get the latest version (as of April 2026, ), always use official sources to ensure software integrity: Introduction to HEC-RAS - Hydrologic Engineering Center hec-ras 2d download
HEC-RAS 2D Download: Comprehensive Guide to Installation and 2D Modeling hec-ras 2d download
The software is developed by the U.S. Army Corps of Engineers (USACE) and is for the public. How to Download HEC-RAS 2D hec-ras 2d download