When are dropman holes provided in a sewerage system ?

1.	When are dropman holes provided in a sewerage system ?
A.	There is a change from gravity system to pressure system
B.	There is a change in the elevation of the ground level
C.	There is change in the diameter of the sewer
D.	There is change in the direction of the sewer line
Answer» C. There is change in the diameter of the sewer

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When are dropman holes provided in a sewerage system ?

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