×
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

Choosing the type of flow regime in HEC-RAS for FEMA studies

Choosing the type of flow regime in HEC-RAS for FEMA studies

Choosing the type of flow regime in HEC-RAS for FEMA studies

(OP)
I have reviewed projects done for FEMA, mapping the 100 and 500 year studies by different contractors. I have seen models turned in been run with 'Supercritical' flow regime and 'Mixed' flow regime. So my 2 questions are:

1) Does FEMA guides and specs favor any time of run? I do not recollect anything mentioned about this.
2) How do the results (the WSEL) vary for the 3 flow regimes?

thanks

RE: Choosing the type of flow regime in HEC-RAS for FEMA studies

If you have

subcritical channel - then run in subcritical regime
supercritical channel - then run in supercritical regime
for a channel that switches back and forth - use mixed flow

If you aren't sure, then try mixed flow regime.  then after running it, you determine it is not mixed, switch to one of the other modes as appropriate.

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