4" Main Drain Line Capacity?

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Molo

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My question is how much capacity is a 4" pvc line capable of handling? I've seen 4" lines going out of apt. buildings, and am wondering what their capacity is.

Thanks for any replys!
 

GabeS

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There are plumbing charts that you can google that tell you all that fun information.
 

Redwood

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sewercapacity.gif
 

hj

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capacity

You will notice in the chart one peculiarity of geometry. At almost all points on the chart a 4" pipe has approximately twice the capacity of a 3" line.
 
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