Civil Engineering - GATE Exam Questions - Discussion

43. 

The drop manholes are provided in a sewerage system when there is

[A]. change in alignment of sewer line
[B]. change in size of sewers
[C]. change in the elevation of ground level
[D]. change from gravity system to pressure system

Answer: Option C

Explanation:

No answer description available for this question.

Chhaya said: (Jul 4, 2017)  
I think all four condition drop manhole required.

Jagdish said: (Jul 6, 2017)  
Answer is B.

Varma said: (Feb 10, 2018)  
I think B is correct. I also agree.

Abdul said: (May 16, 2018)  
When a sewer connects with another sewer, where the difference in level between invert level of branch sewer and water line in the main sewer at maximum discharge is greater than 0.6m, a manhole may be built either with vertical or nearly vertical drop pipe from higher sewer
to the lower one.

So, C is the correct option.

Neeraj said: (Feb 10, 2020)  
Selecting the best alternative leads to option C.

Mostafa Hafij Ahmed said: (Jun 27, 2020)  
I think A is the correct answer.

Adnan Memon said: (Nov 13, 2020)  
Option C is correct because Drop manholes are provided to connect high level sewer with low level sewer so, Change in elevation b/w two is necessary.

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