HEC-RAS 6.0 beta is now available!

Written by Chris Goodell | December 16, 2020

RAS Users!  Go get your copy of HEC-RAS 6.0 beta.  It’s now available!!!
I’ve had the opportunity to test drive the new 2D bridge feature and it is AWESOME!  Very easy to use and finally gives us the ability to model bridges in 2D!!!  HEC will also make available some data sets to demonstrate how these new features work.
Also…Stay Tuned for an upcoming Full Momentum Vodcast where we’ll interview Gary Brunner about all of these new features.

From Gary Brunner, Lead Developer of HEC-RAS:  “I am very happy to announce that we just release HEC-RAS 6.0.0 Beta.  This version represents the most significant release of HEC-RAS since the original 5.0 release that contained 2D modeling capabilities.   This Beta version is being placed on our normal web page, and will be available for anyone to download and try out.  As HEC-RAS Beta Testers, you are hearing about it first through this email.  The Beta test period will last approximately three months, depending on how many bugs are found and the time needed to fix them.   New documentation comes with the software (PDF files), but we now also have an online presence for documentation.  The online documentation has an area for “Known Issues”.  We will be keeping this up to date as issues are discovered in the Beta version.  So please monitor this page before sending us any bugs you find.  You can also get to the Bug Report portion of the RAS web page from the Know Issues page, or go directly to the normal HEC-RAS web page to send us any bugs you find.

Here is the link to the HEC-RAS 6.0.0 Beta download area of our webpage:


Here is the link to the new HEC-RAS Online Documentation Page:


Enclosed are the Release notes for this version, which has a description of most of the new capabilities.  Here is a list of some of the most significant new features:


  1. Spatial Precipitation and Infiltration for 2D areas, Storage Areas, and 1D river reaches. 
  2. Bridge Hydraulics inside of 2D Flow Areas.
  3. HECRAS Mapper Editing Tools for all HEC-RAS features. 
  4. 1D Finite Volume Solver.
  5. Wind forces to HEC-RAS 1D and 2D. 
  6. Computational Speed Improvements for 2D. 
  7. DSS7
  8. Enhancements to Pump Stations in 2D Areas. 
  9. New Breach Time Series Plot. 
  10. New Hydrograph Plotter. 
  11. Physically Based Breaching Option
  12. 3D Graphics/Animation viewer.
  13. Raster Calculator in HEC-RAS Mapper. 
  14. Terrain Modification Tools. 
  15. Enhancements to Grid/Mesh Generation Tools.
  16. New Initial Conditions type for 2D Areas.
  17. Iterative Matrix Solvers, for improved 2D computational speed. 
  18. New 2D Shallow Water Equation solver in HEC-RAS. 
  19. New turbulence modeling methods. 
  20. Non-Newtonian fluids option for 1D and 2D (i.e. Mud and Debris flow modeling). 
  21. 2D Sediment Transport Computations (transport, erosion and deposition for 2D modeling). 
  22. New 1D Sediment Features.
  23. New Water Quality Computations. 
  24. New Debug Report Zip File Option. 

Thank you for being Beta testers of the HEC-RAS software.  We appreciate your time in testing and evaluating HEC-RAS.”



  1. Sean Welch

    on December 16, 2020

    Awesome news! Thanks for posting this CG!

  2. West

    on December 17, 2020

    Where is HEC-RAS 5.1? Any notes and stories about that version?

  3. Chris Goodell

    on December 17, 2020

    HEC skipped 5.1 and went right to 6.0 beta.

  4. Alem

    on December 17, 2020


  5. Garrett Johnston

    on December 18, 2020

    Santa came early! This is such a huge update.

  6. michael tay

    on December 20, 2020

    I noticed that Version 6 could not handle bridge structure in a 2 D Area with S.I unite.. The Htab Curve seemed to be stating from Head elevation zero instead of the channel invert.

  7. Ubaldo Gomez

    on December 20, 2020

    Good news for hydraulic modelers. The bridges as internal “boundary” condition are working and very easy to use it (like in the traditional 1 D) so it is a very great advance in water modeling. Like the 2D bridge the dam as internal boundary it is working and similar results than the dam as 2d storage boundary condition or the dam as inline structuree. It is nice to confirm results with the dambreak and floodwave software. Now we are going to check the sediment transport ( we use the He6 previously) and later the gridded Rainfall. But I think that HEC will recover the 1st postion in water modelling even because I always have thought that it was the best one.

  8. Ciara Doyle

    on December 22, 2020

    This has made my 2D modeling so much easier already. I did notice between 6.0 and 5.0.7 I get the error “Unable to compute face tables. The terrain associated with this geometry does not completely cover the 2D Flow Area” if I regenerate my computation points, despite my terrain extending well beyond my mesh.

  9. Carlos Abrego Suarez

    on December 24, 2020

    What a Christmas present!

  10. Zach

    on December 30, 2020

    Thank you for the update. HEC had told me there was a practical limit of about a million cells, possibly unintentionally, in Version 5. Has anyone had a chance to determine if the limit of a million cells has been improved significantly with Version 6?

  11. Saleem Munawar

    on December 31, 2020

    I downloaded the User Manual for this new Beta Version but that needs a password to open. Please guide

  12. Chris Goodell

    on December 31, 2020

    Not sure. I don’t need a password. Did you try opening it directly from the Help menu item in RAS?

  13. Saleem Munawar

    on January 1, 2021

    Nope, downloaded manual from their site first. Now would install this new version and open from help. Thanks

  14. Sandra Villamizar

    on January 18, 2021

    Hi, I’ve been trying to access the RAS download page during the last days and the pages are not loading. Does anybody know what is happening?
    see: https://www.hec.usace.army.mil/software/hec-ras/download.aspx

  15. Duc Ng

    on January 21, 2021

    I’ve experienced with new beta Version, having some issues (problems)
    1. Time series data starts after the simulations starts
    This happened when I ‘save as’ the project and change the unsteady flow data to a historic flood event. All settings are good and the model run perfectly in 5.07 Version, but it stopped at very beginning with 6.0 Beta updated 1. The problem of ‘Time series data starts after the simulations starts’ persisted even I tried to modified starting/ending time both in unsteady flow and simulation plan files
    2. Somewhat result layers run by 5.0x versions do not shown up in Ras Mapper 6.0. However it allows me to extract the profiles data
    3. It is still not allowed to add an aerial photography or satellite imagery having 3 bands. I tried to add an image extension *.img and *.tif , none worked
    4. It is quite useful sometime we need to plot terrains above a background image. Ras Mapper does not allow this. Hope new version will allow Terrains to move up Map Layers
    5. View results in 3D mode is terribly slow. My model is 765k cells and grid sizes of 1-20m, poss processing file (hdf) is ~720 MB, it took so long to load 3D Viewer and impossible to use fly modes to view the results

  16. Marco

    on January 28, 2021

    Hi, as same as Sandra i have problems trying to access to the web site by us army corp of engineering (https://www.hec.usace.army.mil/software/hec-ras/download.aspx), and the page is not downloading. Can anyone help me with this?
    Thank you

  17. Chris Goodell

    on February 3, 2021

    Marco, all I can say is keep trying. Not sure why it’s not working for you.

  18. Scott Ferguson

    on February 18, 2021

    Hi, Maybe it’s just me – but the units for Green-Ampt methods are a bit confusing. I’m working in SI units, the manual says inches or centimetres, the data entry screen says inches, the value provided in the manual are in mm, I’ve a test run using inches but virtually no losses, and I’ve tried mm and the results make no sense. Any advice?

  19. Chris Goodell

    on February 23, 2021

    Sounds like HEC needs to work on the units labeling with this new feature. I suggest sending a bug report to HEC to let them know.

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