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


Modeling lateral overflow weir connected to two ponds in series

Modeling lateral overflow weir connected to two ponds in series

Modeling lateral overflow weir connected to two ponds in series

I've got a question about handling tailwater in HEC-HMS.

Situation: I'm modeling a proposed lateral overflow weir on an existing engineered channel. Overflow from the weir, along with watershed runoff, will be collected in a detention pond (Pond #1), Pond #1 will be connected downstream to a secpmd pond (Pond #2) by two 6-foot concrete box culverts (two ponds because of a utility easement running through the property). Pond #2 will outfall into the channel downstream of the lateral weir.

My current modeling approach is to use a diversion element in HEC-HMS with the lateral weir option connecting to two reservoir elements in series, which then connect to the downstream end of the reach. I can create a tailwater rating curve for the outfall from Pond #2 based on a HEC-RAS model of the channel. My question is, how do I model the tailwater effect on the outfall from Pond #1 into Pond #2 and also from the overflow weir into Pond #1? Is this something HEC-HMS can do, or do I need to try tackling it in SWMM?

RE: Modeling lateral overflow weir connected to two ponds in series

It has been some time since I used HMS, but, I do recall that it does not account for tailwater. You can develop a rating table that accounts for submergence on a weir based on tailwater. That is an external analysis, however, and will require coding the rating table into HMS. ICPR is a program that will allow flow to be routed upstream and downstream based depending on water surface elevations. I am not sure SWMMM will do that. Hope that helps.

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!


eBook - Mastering Tolerances for Machined Parts
When making CNC machined parts, mastering tolerances can be challenging. Are general tolerances good enough? When does it make sense to call out for tighter tolerances? Do you need a better understanding of fits, datums, or GD&T? Learn about these topics and more in Xometry's new e-book. Download Now
eBook – How to Choose the Correct Corrosion Testing Method
When designing a metal component, engineers have to consider how susceptible certain alloys are to corrosion in the final product’s operating environment. In a recent study by NACE (National Association of Corrosion Engineers), it was estimated that the direct and indirect costs of corrosion in the United States is approximately 6.2% of the GDP. In 2016, that cost exceeded $1 trillion dollars for the first time. 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