Civil Engineering - Waste Water Engineering - Discussion

Discussion Forum : Waste Water Engineering - Section 4 (Q.No. 5)
Pick up the correct statement from the following :
The boning rod is used for checking the levels of the sewer inverts
Manhole covers are made circular for the convenience of the cleaning staff
A manhole is classified as deep manhole if its depth is more than 1.5 m
A manhole is classified as shallow manhole if its depth is. less than 0.9 m
All the above.
Answer: Option
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