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Force Main draining to Manhole

Force Main draining to Manhole

Force Main draining to Manhole

(OP)
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?  

RE: Force Main draining to Manhole

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

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

RE: Force Main draining to Manhole

Maximum flow at occurs near 0.8 pipe depth for gravity.

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