Waste Water Engineering
In detritus tanks,

Organic and inorganic materials are separated
Flow velocity is kept 0.09 m/sec
All listed here
Detention period is kept 3 to 4 minutes

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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
Pressure sewers are designed to be safe in tension
All listed here

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