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

Flow Regulation Formula

Flow Regulation Formula

Flow Regulation Formula


I need a formula or method to calculate what length of 9" pipe I need to regulate flow from a detention chamber, with a max head of 5.36 feet, to a maximum discharge of 88 litres per second?

RE: Flow Regulation Formula

You should go to your pipeline design book and find it. It is a fairly simple problem. You will have to know the slope of the 9" pipe butthat's about all. May be helpful to convert all the numbers to one system. Max discharge will be with max head. However, a 9" pipe only has .45 square foot of area and you want to push about 3cfs through it. the velocity will be in the range of 7 fps.

RE: Flow Regulation Formula


Typically (at least in this part of the planet), detention pond release is regulated by an orifice plate or a weir.  Could you explain your situation a little more as to why you would need to regulate the flow with a pipe?


RE: Flow Regulation Formula

Hi, thanks for you interest.

We are discharging into the system of a private buisness park, which will allow 88 Litres per second to enter. They want us to use a restriction pipe to regulate the flow.
I have, since posting the query, solved the problem using the Colebrook White equation. I you have a more appropriate method I would appreciate your help.


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


Low-Volume Rapid Injection Molding With 3D Printed Molds
Learn methods and guidelines for using stereolithography (SLA) 3D printed molds in the injection molding process to lower costs and lead time. Discover how this hybrid manufacturing process enables on-demand mold fabrication to quickly produce small batches of thermoplastic parts. Download Now
Design for Additive Manufacturing (DfAM)
Examine how the principles of DfAM upend many of the long-standing rules around manufacturability - allowing engineers and designers to place a part’s function at the center of their design considerations. Download Now
Taking Control of Engineering Documents
This ebook covers tips for creating and managing workflows, security best practices and protection of intellectual property, Cloud vs. on-premise software solutions, CAD file management, compliance, and more. 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