Waste Water Engineering
A drop manhole is provided if

A lamp is inserted to check obstruction
A sewer drops from a height
A branch sewer joins the main sewer at higher level
None of these

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Waste Water Engineering
The pressure exerted by

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

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