Force Main draining to Manhole

[redbridge]

What is the maximum flow from a force main that you would allow to empty into a 6' deep manhole with 8" gravity discharge line? I typically design so that the 8" gravity line will run full. Does anyone allow for a surcharge in the manhole?

 

[dicksewerrat]

I take it you never have odor problems. I wouldn't go past 75% full.

Richard A. Cornelius, P.E.

http://WWW.amlinereast.com

 

[civilperson]

Maximum flow at occurs near 0.8 pipe depth for gravity.