Waste Water Engineering
In a grit chamber of a sewage treatment plant,

Depth of 0.9 m to 1.20 m is kept
Flow velocity 0.15 m to 0.3 m/sec is kept
All of these
One minute of detention period is kept

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Waste Water Engineering
The pressure exerted by

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
All listed here

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