×
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

48 inch pipe, how many CFS can it handle

48 inch pipe, how many CFS can it handle

48 inch pipe, how many CFS can it handle

(OP)
We will be rebuilding a damaged dam that was never built correctly in the first place.

The spillway consisted of a 48 inch vertical corrugated metal pipe. We have completed out hydrology but the question remains how many CFS (cubic feet per second) would have this old system been able to handle. I need to show that this system was flawed to begin with since our 100 year flood calculations come out to 906 CFS and the structure in question overtopped every few years (which should be of no surprise).

RE: 48 inch pipe, how many CFS can it handle

You need to hire an engineer familure with dam / spillway design.  The capacity of the pipe you have described, varies with the water level above the top of the pipe.  Additionally, the capacity may be controled by the outlet of the pipe or some other portion of the pipe.

Why do you believe that the design was flawed?  Just because it overtopped doesn't mean there was a flaw in the design.

RE: 48 inch pipe, how many CFS can it handle

The capacity of the old pipe system is likely somewhere around 75-100 cfs.   

RE: 48 inch pipe, how many CFS can it handle

(OP)
TO GEOPAVETRAFFIC: I stated it was flawed since it overtopped every 2 years or so. It was not sufficient to handle the inflow from the onset. It was built in 1976 by the developer who did consult with an engineer but then went on to do what he wanted. I spoke to the engineer he consulted with and he did design it with a concrete spillway and dewatering valve, none of which exist.

TO DAMENG1: Thanks. Our Q100 is rated at 605 cfs while out PMF is at 1632 cfs. The CMP was woefully inadequate from the get go. Goes to show what happens when you don't listen to the professionals!
 

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