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Download HEC-RAS 6.3.1 (Primary) Setup Package (205 MB) [Release Notes] Download HEC-RAS 6.3.1 (Alternate) Setup Package (205 MB) [Release Notes] Download HEC-RAS 6.3 Example Projects (421 MB) Download HEC-RAS 6.3 Setup Package (201 MB) [Release Notes] Download HEC-RAS 6.2 Setup Package (201 MB) [Release Notes] Download HEC-RAS 6.1 Setup Package and Documentation (336 MB) [Release Notes] Download HEC-RAS 6.0 Setup Package, Documentation, and Example Data sets (729 MB) [Release Notes] Download HEC-RAS 5.0.7 Setup Package Documentation, and Example Data sets (691 MB) [Release Notes] Download HEC-RAS 5.0.7 Setup Package and Documentation (385 MB) [Release Notes] Download HEC-RAS 5.0.6 Setup Package Documentation, and Example Data sets (659 MB) Download HEC-RAS 5.0.6 Setup Package and Documentation (358 MB) Download HEC-RAS 5.0.5 Setup Package Documentation, and Example Data sets (715 MB) Download HEC-RAS 5.0.5 Setup Package and Documentation (414 MB) Download HEC-RAS 5.0.4 Setup Package Documentation, and Example Data sets (715 MB) Download HEC-RAS 5.0.4 Setup Package and Documentation (414 MB) Download HEC-RAS 5.0.3 Setup Package Documentation, and Example Data sets (525 MB) Download HEC-RAS 5.0.3 Setup Package and Documentation (202 MB) Download HEC-RAS 5.0.1 Setup Package Documentation, and Example Data sets (525 MB) Download HEC-RAS 5.0.1 Setup Package and Documentation (202 MB) Download HEC-RAS 5.0 Setup Package Documentation, and Example Data sets (525 MB) Download HEC-RAS 5.0 Setup Package and Documentation (202 MB) Download HEC-RAS 4.1 (49.7 MB) Download HEC-RAS 4.0 (45.4 MB) Download HEC-RAS 4.0 Beta (35.6 MB) Download HEC-RAS 3.1.3 (39.7 MB) Download HEC-RAS 3.1.2 (44.6 MB) Download HEC-RAS 3.1.1 (19 MB) Download HEC-RAS 3.0 (24.5 MB) Download HEC-RAS 2.2 (8 MB)

If you are experiencing a problem with HEC-RAS, please submit your report by clicking the button below. Sometimes a graphical representation of the bug helps out. See a good example. For a detailed discussion and demonstration of how to package model files please click here.

If what you want to tell us is really more of a suggestion or a request for enhancement, please see our Suggestion Page instead. If you are seeking technical support, please see our Support Page. Corps users can seek support with HEC-RAS using Discourse.

Message from HEC on the new release of HEC-RAS version 5.0.4. Make sure to also check on the new Verification/Validation and the Benchmarking documents.

***Note. If you originally downloaded 5.0.4 before May 4 at 4:00 pm PDT then please redownload and install from the links below. There were some minor errors found in the original release.

Download HEC-RAS Version 5.0.4 here:

Download RD-52 HEC-RAS Verification and Validation Tests document here:

Download RD-51 Benchmarking of the HEC-RAS Two-Dimensional Hydraulic Modeling Capabilities here:

There are several other new useful documents related to HEC-RAS here: http://www.hec.usace.army.mil/software/hec-ras/documentation.aspx

From HEC:

We have released the final version of HEC-RAS 5.0.4 today. It is now available for download from our webpage at the link below. I have enclosed the 5.0.4 release notes for your review. I have also included a separate document that describes how to use the new features contained in this version. Additionally I have also included a document on how to spec out a computer for doing 2D modeling with HEC-RAS.

We hope you enjoy the new version of the software. As always, please keep us informed on any bugs you find, or your ideas for new features. Here is the link to the HEC-RAS 5.0.4 web page:

The following is a list of the major new features you can read about in the Release Notes and the Supplemental User’s Manual:

1. New RAS Mapper Pre-Processor Tools
2. Variable Time Step Capabilities (improved accuracy and faster run times)
3. Increased Computational Speed for 2D Computations (2 to 5 times faster run times)
4. Enhancements to SA/2D Hydraulic Connections
5. New 2D Polygon Mesh Refinement Tool
6. Internal Boundary Condition Lines for 2D Areas
7. New Velocity Term for 2D Flow Area Boundary Conditions
8. 64–bit Version of RAS Mapper and 64-bit 2D Pre-Processor (RAS now can handle much larger 2D models)
9. Improved Terrain Generation Utility
10. Improved Manning’s n Layer Development
11. Sediment – New Options in the User Defined Grain Class Editor
12. Sediment – New Transport Function Calibration Options

WARNING: Some of the bug fixes “may” cause the computed results from 5.0.3 to 5.0.4 to change. Please read the Release Notes carefully for information about these changes.

There are two new verification and validation documents for HEC-RAS now available on our web page in the HEC-RAS area. Here is a short description of each:

1. RD-52 HEC-RAS Verification and Validation Tests (Enclosed in this email)

This is the first ever full blown Verification and Validation document for HEC-RAS. In this report we compare HEC-RAS to: analytical and text book data sets; lab studies, and real world flood events with good observed data. This report covers 1D steady flow; 1D unsteady flow, and 2D unsteady flow computations. The report verifies that HEC-RAS correctly solves the equations used in each of these computational frameworks, and it verifies that HEC-RAS can be used for a very wide range of riverine modeling conditions. It can aslo be download here:

1. RD-51 Benchmarking of the HEC-RAS Two-Dimensional Hydraulic Modeling Capabilities

This research document summarizes how the Hydrologic Engineering Center's (HEC) River Analysis System (HEC-RAS) software performed in the two-dimensional (2D) modeling benchmark tests developed by the United Kingdom's (UK) Joint Defra (Department for Environmental Food and Rural Affairs) Environment Agency. This is an updated version of this report that we previously developed. We re-ran all of the test, plus one new test, with version 5.0.4 of HEC-RAS. The results are even better than before, and the HEC-RAS computational speed is much faster than previously document. This report can be downloaded from our web page at the following link: