Normal Depth

[jack42]

Hi
I am wanting to know what direction I need to go with the Manning’s equation to find the normal depth for a 60" diameter pipe with a discharge of 75 (n=0.012. the pipe has a slope of 1.20 percent. thanks any help would be great

 

[dicksewerrat]

Your discharge is 75_______. What gpm, cfs, acre feet per minute? Then set up a spreadsheet with the Mannings formula that gives you discharge by depth of flow. Start substituting until you get it.

Richard A. Cornelius, P.E.

http://WWW.amlinereast.com

 

[bimr]

http://en.wikipedia.org/wiki/Open_channel_flow

There is a free calculator on the web:

http://www.wq.uiuc.edu/dg/Equations/Mannings.exe