Waste Water Engineering
A sewer running partially full and hurried with back filled, fails in compression due to

Weight of the back fill
All listed here
Weight of the pipe
Superimposed traffic loads

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Waste Water Engineering
The pressure exerted by

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

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