INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

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.

Jobs

Link To This Forum!

Partner Button
Add Stickiness To Your Site By Linking To This Professionally Managed Technical Forum.
Just copy and paste the
code below into your site.

Formula

Formula

(OP)
Can anyone tell me the formula for calculating sewer flow rate in a gravity oval sewer. What I'm working on is old gravity sewers in Newark, NJ. Combined sewer, some oval some teardrop shaped. I found circular and rectangular but nothing on oval and teardrop. Thanks.

RE: Formula

You use the Manning's equation.
You will have to draw the ovals  on paper and measure the wetted perimeter and calc. the area with planimeter to get the Hyd Radius. ask someone in the drafting dept if they have done this. I will contact some people I kknow in Mpls to see if they havethe numbers. I do have numbers for brick egg sewers.

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

RE: Formula

elliptical pipe design tables are available in the concrete pipe design manual:

http://concrete-pipe.org/designmanual.htm

not sure what size(s) you need, but combined sewer sizes are probably in these.

 

RE: Formula

I have the numbetrs for cemeny oval pipes
12 inch cement oval, Area- .83 Sq. Ft., circum. = 40.19 inches
15 inch cement oval, Area = 1.27 sq. ft.Circum. = 49.64 inches
18 inch cement oval, Area = 1.81 sq. ft. Circum. = 58.21 inches.
These are pipes that look like drain tiles and are 100 plus years old. They tend to deteriorate with a pattern that reflect the compaction effort during the construction  of the pipe. The inside of the old pipe takes on a look like a corrugated pipe with a long span from peak to peak. This is the stoke of the machine that made the pipe. I will try to post some drawings of these. These drawings and numbers are courtesy of the City of Mpls., Sewer Maintenance Dept. At least that is what it was called back when I was in charge.  

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

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

White Paper: Agile Product Engineering and Improved Product Outcomes
Today’s product development cycle is fraught with difficulties. Increased demands for complex functionality and reduced product development windows cause engineering teams to borrow practices from the IT industry, swapping outdated serial workflows for a more flexible and collaborative design method known as Agile Product Engineering. 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