Waste Water Engineering
The detention time of a circular tank of diameter d and water depth H, for receiving the sewage Q per hour, is

d (0.785d + 0.011H)/Q
d² (0.011d + 0.785H)/Q
d (0.285d + 0.011H)/Q
d (0.022d + 0.085H)/Q

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Waste Water Engineering
The pressure exerted by

The sewage when running full from inside, is called internal pressure
The internal pressure if any, causes tensile stress in the pipe material
Pressure sewers are designed to be safe in tension
All listed here

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