Waste Water Engineering
For efficient working of a sewer, it must be ensured that

Neither (A) nor (B)
Both (A) and (B)
Minimum velocity of 0.45 m/sec, is maintained at its minimum flow
A maximum velocity of 0.90 m/sec, is maintained at its maximum flow

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Waste Water Engineering
The pressure exerted by

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

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