Waste Water Engineering
Drop manholes at the junctions of sewer lines, are provided if

Ordinary manhole cannot be built
Sewer line runs along a main road
Invert level of a branch sewer is more than 60 cm that of the main sewer
Two sewer lines intersect

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Waste Water Engineering
The pressure exerted by

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

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