Waste Water Engineering
A drop manhole is provided if

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

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Waste Water Engineering
The sewers

Must be of adequate size to avoid over flow
All listed here
Must flow under gravity ½ to ¾ full
Must be laid at least 2 to 3 m deep to collect /water from the basements

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