Waste Water Engineering
A drop manhole is provided if

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

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Waste Water Engineering
In case of sewer lines

Obstruction test is carried out with the help of smooth ball of diameter 13 mm
Water test is carried out to check water tightness of the joints
Test for straightness is carried out with the help of a lamp and mirror
All listed here

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