Civil Engineering - GATE Exam Questions - Discussion

39. 

A circular sewer 2 m diameter has to carry a discharge of 2 m3/s when flowing nearly full. What is the minmum required slope to initiate the flow ? (Assume Manning's n = 0.015)

[A]. 0.00023
[B]. 0.000036
[C]. 0.000091
[D]. 0.000014

Answer: Option C

Explanation:

No answer description available for this question.

Amit Padiyar said: (Nov 26, 2016)  
Q = (1/n) * R^(2/3) * s^.5 * d2/4.
S = .00023 ans.

Lee said: (May 2, 2017)  
Yes, option A is the right answer.

Agree @Amit.

Phani said: (May 7, 2018)  
C is correct.

V = 1/n x r^2/3 x s^1/2.
Q = AxV.
2 = pai/4x4 x 1/0.015 x 1^2/3 x s^1/2,
S = 9*10^-4 = 0.00009.

Kunti said: (Sep 25, 2018)  
You are right @Phani.

Shivaprasad Sajjan said: (Feb 20, 2019)  
.00009 is correct.

You are right @Phani.

Vivek Mishra said: (Jun 8, 2019)  
@Phani.

Hydraulic mean depth for circular section is 28D for max discharge and 3D for maximum velocity then how could you take m= 1?

Prem said: (Sep 11, 2019)  
I think A is correct one.

Mahesh Sinh said: (May 23, 2020)  
According to me, A is the correct answer.

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