Drop manholes at the junctions of sewer lines, are provided if________________?

A. Invert level of a branch sewer is more than 60 cm that of the main sewerCorrect Answer

B. Sewer line runs along a main road

C. Ordinary manhole cannot be built

D. Two sewer lines intersect

Correct Option: A. Invert level of a branch sewer is more than 60 cm that of the main sewer

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