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

Sizing a riprap basin for oversized box culvert outfall

Sizing a riprap basin for oversized box culvert outfall

Sizing a riprap basin for oversized box culvert outfall

I am trying to find some reference material regarding the sizing of riprap outfall basins for larger diameter outfall culverts. The only references I can find provide sizing tables for pipes with diameters up to 96". However, due to lack of significant head on the lake outfall structure, the outfall culvert has to be a box that has a greater outfall orifice area. The velocities coming out of the culvert are low enough to allow for a riprap outfall, but I just can't find any materials that would detail how to size the basin. Any suggestions are greatly appreciated.

RE: Sizing a riprap basin for oversized box culvert outfall

The PA Erosion and Sediment Pollution Control Manual available here:


on pages 119-121 gives the equations in terms of D, so you can just  use Deq of a rectangle =2L1L2/(L1+L2) to get D.

This will pass in PA, USA, so run it by the local reviewer first.

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


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