Drop manholes at the junctions of sewer lines, are provided if________?
AInvert level of a branch sewer is more than 60 cm that of the main sewer
BOrdinary manhole cannot be built
CSewer line runs along a main road
DTwo sewer lines intersect
Correct answer
A. Invert level of a branch sewer is more than 60 cm that of the main sewer
Explanation
The correct answer is Invert level of a branch sewer is more than 60 cm that of the main sewer.