×
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

Energy Dissipation in Steep Concrete Flume

Energy Dissipation in Steep Concrete Flume

Energy Dissipation in Steep Concrete Flume

(OP)
Is there a calculation to design energy dissipation blocks in a steep concrete flume running perpendicular to a roadway?

The drainage area is roughly 2.5 acres with a 100yr flow rate of +/-12cfs.  The concrete flume is 2' wide for 250LF on a 3:1 hill and the velocity will be approaching 20fps.  At the bottom will be a large rip rap plunge pool but I would like to add concrete blocks (maybe 4"x4" or 6"x6") staggered every so often along the length of the flume to beat up the water and dissipate the energy.  Anyone done this before?

Thanks in advance!! Dave

RE: Energy Dissipation in Steep Concrete Flume

FHWA's HEC14 should have the design for your situation.

RE: Energy Dissipation in Steep Concrete Flume

build steps instead of blocks. the steps will dissipate energy, be easier to construct and overall the structure will be safer and not so enticing to skate boarders

RE: Energy Dissipation in Steep Concrete Flume

We used Large box culverts cut in half. so we had 2 U shapes. Installed them in a step pattern down a hillside into a river. We installed them so the next one up the hill rested on the lower one and shotcreted them to seal the opening on the hill side. It worked well about a 95 foot drop. Other than that, I always wanted to put channel in with an Ogee curve at the bottom to get the water to fly up and out into the river. The powers that be told me that the Army Corps of Engineers would reject it because we might sink a boat or two.

Richard A. Cornelius, P.E.
WWW.amlinereast.com

RE: Energy Dissipation in Steep Concrete Flume

I believe you are talking about a OGEE spillway with a flip bucket, very enticing for knucklehead skateboarders trying to catch some air...

RE: Energy Dissipation in Steep Concrete Flume

A ski jump (trajectory basin) is effective when the approach energy head is at least 50 m and the discharge (in m3/s) is smaller than 250(H-Ho) with Ho = 8 m (Mason, 1982, 1993)...

RE: Energy Dissipation in Steep Concrete Flume

100yr flow rate of +/-12cfs

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