Waste Water Engineering
A drop manhole is provided if

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

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Waste Water Engineering
The sewer pipes

Should resist the wear and tear caused due to abrasion
All listed here
Carry sewage as gravity conduits
Are designed for generating self-cleansing velocities at different discharge

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