Civil Engineering - Hydraulics - Discussion


Manning's formula is used for

[A]. flow in open channels
[B]. head loss due to friction in open channels
[C]. head loss due to friction in pipes flowing full
[D]. flow in pipes.

Answer: Option B


No answer description available for this question.

Prashant said: (Jul 4, 2017)  
No, the manning's formula used to describe velocity in open channels, it is does not depend upon friction and head loss anyway.

Nyam said: (Jul 22, 2017)  
I think its flow in open channels, though applicable to pipes.

Bablu said: (Aug 23, 2017)  
The correct option is A.

Gurpreet Singh said: (Sep 9, 2017)  
No guys.

Option B is correct because in Manning equation n is roughness coefficient and it deals with the roughness of channel which means Manning equation deals with friction losses in open channel flow.

Islam said: (Dec 29, 2017)  
The Answer is A.

Ravi Raj Anand said: (Feb 9, 2018)  
Answer is B, Chezy equation is used for flow in open channel.

Upendra said: (Feb 27, 2018)  
I agree @Bablu.

Option A is correct.

Priya said: (Mar 22, 2018)  
Agree @Gurpreet Singh.

Bdk said: (May 30, 2018)  
Option A is correct.

Basavaraj said: (Aug 24, 2018)  
Option A is correct because of Chezzy equation= √ (8g/f).

Vikki said: (Jun 25, 2019)  
A is the correct.

Subhadeep said: (Sep 5, 2019)  
Please give the explanation of the answer.

Pankaj Dubey said: (Sep 7, 2019)  
V=1/n * R^2/3 * S^1/2.


v = Velocity.
n = Manning's Roughness Coefficient,
R = Hydraulic Radius,
S = Channel Slope or friction slope,

Note- Manning's Equation can be rearranged to solve for slope (S), which is termed the friction slope sf. The friction slope is part of the gradually varied flow used to solve for the water surface profile through a culvert.

Pratik said: (Dec 31, 2019)  
The Manning equation is a widely used and very versatile formula in water resources. It can be used to compute the flow in an open channel, compute the friction losses in a channel, derive the capacity of a pipe, check the performance of an area-velocity flow meter, and has many more applications.

Shubham said: (Jan 10, 2020)  
Yes, Option A is correct.

Qateel said: (Sep 18, 2020)  
Yes, Both A and B are correct.

Sunny said: (May 31, 2021)  
Manning formula for head loss is;

H = n2.v2.l/r4/3.

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