What's New

HEC-RAS
  Features
  What's New
  Download
  Documentation
  Known Issues
  Bug Report
  Suggestions
  Demo
  Sponsors
  Collaborators

HEC-GeoRAS
  Downloads
  Known Issues



Support Policy

Version 4.0 of the River Analysis System (HEC-RAS) is now available.  This version supersedes version 3.1.3, which was released in May of 2005 to the general public.  Several new simulation features have been added to the program since that time.  Version 4.0 of HEC-RAS includes the following new features:

1.     Sediment Transport/Movable Bed Modeling

2.     Sediment Impact Analysis Methods (SIAM)

3.     Water Quality Capabilities
            a. Temperature modeling
            b. Transport and fate of a limited set of constituents

4.      User Defined Rules for Controlling Gate Operations

5.      Modeling Pressurized Pipe Flow

6.      Pump Station Override Rules

7.      Hager’s Lateral Weir equation     

8.      New Channel Design/Modification Tools

9.      Geo-Referencing Tools

10.    New Gate Types

11.    New Functionality for Lateral Weirs

12.    Additional Graphical Outputs

13.    Shortcut Keys for Graphics

14.    User’s Manuals and Help System

For a more detailed discussion of the new features in HEC-RAS 4.0, please read the release notes:

HEC-RAS 4.0 Release Notes (PDF format)