Waste Water Engineering
The pressure exerted by

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

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Waste Water Engineering
In septic tanks,

The clear space between the baffle top and covering slab is about 7.5 cm
All listed here
Free board of 0.3 m may be provided
The baffles or tees are extended up to top level of scum

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