×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Contact US

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

HydroCAD v HEC-RAS (for water surface elevation evaluation)

HydroCAD v HEC-RAS (for water surface elevation evaluation)

HydroCAD v HEC-RAS (for water surface elevation evaluation)

(OP)
I'm trying to write out a statement for our in-house designers why HEC-RAS should be used for a water surface evaluation difference between a pre and post condition in a streambed. A few years ago, Peter wrote, "a reach is intended only for modeling normal flow with a constant cross section", so I'm presuming since a natural streambed has variable cross sections and variable friction forces, than that should be a good enough reason for 'dictating' HEC-RAS?

On the flip side, if I had a 'constructed' ditch/swale with a constant cross section and constant n value (per say), would HydroCAD be acceptable for evaluating a water surface elevation difference in that?

THANKS!!!!

RE: HydroCAD v HEC-RAS (for water surface elevation evaluation)

If you're modeling normal flow with a (reasonably) constant cross-section, a HydroCAD reach will do the job. For a variable cross-section you may need a more detailed water surface profile, as done by HEC-RAS. It all depends on the uniformity of the cross-section and the accuracy that you require. Remember that a reach routing in HydroCAD is intended primarily to generate an outflow hydrograph, rather than evaluate the exact water surface profile. HEC-RAS, on the other hand, is a steady-state analysis which is able to evaluate a more complex channel, but it's not a hydrograph-routing model. Different tools for different purposes.

Peter Smart
HydroCAD Software
www.hydrocad.net

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members! Already a Member? Login


Resources

Low-Volume Rapid Injection Molding With 3D Printed Molds
Learn methods and guidelines for using stereolithography (SLA) 3D printed molds in the injection molding process to lower costs and lead time. Discover how this hybrid manufacturing process enables on-demand mold fabrication to quickly produce small batches of thermoplastic parts. Download Now
Design for Additive Manufacturing (DfAM)
Examine how the principles of DfAM upend many of the long-standing rules around manufacturability - allowing engineers and designers to place a part’s function at the center of their design considerations. Download Now
Taking Control of Engineering Documents
This ebook covers tips for creating and managing workflows, security best practices and protection of intellectual property, Cloud vs. on-premise software solutions, CAD file management, compliance, and more. Download Now

Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close