×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

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!
  • Students Click Here

*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

Jobs

Dam Breach using HEC-RAS

Dam Breach using HEC-RAS

Dam Breach using HEC-RAS

(OP)
I am using HEC-RAS to analyze a dam breach and have a message I cannot seem to resolve.  After Unsteady Flow computation initiation, I get the message "Bottom of breach is beyond the right side of the weir.  Move the center station and/or decrease the final bottom width."  I have changed channel configuration, bottom width, final breach elevation in multiple combinations.  None of the changes helped.  Has anyone experienced this and how do I correct?

RE: Dam Breach using HEC-RAS

Your question is hard to answer without looking at the geometric data but I'll throw out some suggestions to try (disclaimer - I've never had that particular error message while analyizing a dam breach in RAS).  First of all is your dam set up as an in-line structure or as a lateral structure?  For breaching purposes the dam should be set up as an in-line structure.  Second, are you describing your reservoir through x-sections or as a storage area?  If described as a storage area is the storage area properly connected to the river reach?  In the storage area option you need at least 2 x-sections of the river reach inside the storage area and then comes your dam.  Third, have you checked your stationing data for the inline structure to make sure it matches your x-sections stationing?  Lastly, run your model first as a steady flow model without breaching the dam.  Just run some flow like the 10 year or 100 year storm through the dam and down the reach.  It is a lot easier to catch errors in Steady Flow analysis.  You may still have errors when you go to Unsteady Flow, but alot of errors can be eliminated via Steady Flow check.

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!


Resources