Waste Water Engineering
In sewers designed with self cleansing velocity,

Neither silting nor scouring occurs at the bottom
The bottom is scoured
The bottom is silted
Both silting and scouring occur at the bottom

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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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