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Version 4.1 of the River Analysis System (HEC-RAS) is now available. This version supersedes version 4.0, which was released in March of 2008 to the general public, and all previous versions. Several new simulation features have been added to the program since that time. Version 4.1 of HEC-RAS includes the following new features:

1. New RAS Mapper Floodplain Delineation Capabilities
2. Hydrologic Routing Reaches Within an Unsteady Flow Model Run
3. New Flow Data And Boundary Conditions Editor for Unsteady Flow
4. Contraction/Expansion losses for Unsteady Flow
5. Minor Losses for Unsteady Flow
6. New Junction Hydraulics Option for Unsteady Flow
7. Groundwater Leakage for Storage Areas
8. Water Quality Modeling Enhancements
9. Sediment Transport Modeling Enhancements
10. User’s Manuals and Help System

Other minor enhancements were also added. The development team has also continued careful and systematic testing of the program since the last release. The results of that testing in combination with reports from users has allowed the identification and repair of various problems. Some minor problems that did not affect results but caused problems in the program interface have been repaired without being specifically documented.

HEC-RAS 4.1 Release Notes (PDF format)