# Civil Engineering - Hydraulics - Discussion

Discussion Forum : Hydraulics - Section 3 (Q.No. 48)
48.
Manning's formula is used for
flow in open channels
head loss due to friction in open channels
head loss due to friction in pipes flowing full
flow in pipes.
Explanation:
No answer description is available. Let's discuss.
Discussion:
17 comments Page 1 of 2.

Sunny said:   3 years ago
Manning formula for head loss is;

H = n2.v2.l/r4/3.
(1)

Qateel said:   4 years ago
Yes, Both A and B are correct.

Shubham said:   5 years ago
Yes, Option A is correct.

Pratik said:   5 years ago
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.

Pankaj dubey said:   5 years ago
V=1/n * R^2/3 * S^1/2.

Here;

v = Velocity.
n = Manning's Roughness Coefficient,
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.

Vikki said:   5 years ago
A is the correct.

Basavaraj said:   6 years ago
Option A is correct because of Chezzy equation= √ (8g/f).

Bdk said:   6 years ago
Option A is correct.

Priya said:   6 years ago
Agree @Gurpreet Singh.