Waste Water Engineering
¾th or ¼th extra space is left in sewer pipes at maximum discharge for

Large scale infiltration of storm water
All listed here
Unexpected increase in population
Low estimates of the average and maximum flows

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Waste Water Engineering
The pressure exerted by

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

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