Waste Water Engineering
Boussinesq’s equation for ascertaining unit pressure at a depth on sewers due to traffic loads, is

pt = 3H3p/2 Z5
pt = 2H3p/3 Z5
pt = 3H3p/2 Z5
pt = 2H3p/3 Z5

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Waste Water Engineering
The pressure exerted by

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

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