Civil Engineering - Irrigation - Discussion

28. 

The Lacey's regime velocity is proportional to

[A]. R1/2 S3/4
[B]. Q3/4 S1/3
[C]. R3/4 S1/3
[D]. R2/3 S1/2

Answer: Option C

Explanation:

No answer description available for this question.

A D said: (Aug 10, 2016)  
R2/3 S1/3 is this is correct?

Att said: (Oct 2, 2016)  
R2/3 S1/2 is correct.

Md Irshad Alam said: (Mar 27, 2017)  
According to me, V = 1/n R^2/3 S^1/2.

Priya said: (Apr 3, 2017)  
Regime flow equation by Lacey's theory is,

V = 10.8.R^2/3.S^1/3.

So, Answer (D) and Bed slope (S) to the power of 1/3 not 1/2.

Sudip said: (Aug 4, 2017)  
According to Lacey's formula,

Regime flow equation V= 10.80 R^2/3 S^1/2.

Majumder said: (Nov 14, 2017)  
I agree @SUDIP.

Ramavtar said: (Jan 9, 2018)  
Lacey's formula.

Regime flow equation V= 10.80 R^2/3 S^1/2.

Sanath said: (Jan 11, 2018)  
Correct answer is d.

Mahe said: (Feb 17, 2018)  
None of the option is true because according to the formula the powers are 2/3 & 1/3 for R & S respectively.

Chandu said: (Mar 23, 2018)  
The Answer is D.

Sam said: (Apr 24, 2018)  
D is the correct option.

Ganesh said: (Jul 18, 2018)  
Here, V=10.8 R^2/3 S^1/3.

Chinmoy said: (Jul 19, 2018)  
You are absolutely right @Mahe.

All other answer is based on Manning's formula.

Musab said: (Aug 17, 2018)  
The correct answer is R^3/4 S^1/2.
R^2/3 S^1/2 is Mannings equation.
And other equation by Lacey is 16 R^2/3 S^1/3 used for calculating the flood discharges in rivers.

Abhisek said: (Oct 12, 2019)  
Correct and is R^3/4S^1/2.

Viki said: (Nov 9, 2019)  
Lacey's regime flow velocity is option (D).
nonregime flow velocity option (C).

Sanjay Nautiyal said: (Nov 21, 2019)  
Lacey regime flow velocity v = 10.8 R^2/3 S^1/2.

Hisham said: (Feb 21, 2020)  
V=10.8 R^2/3 S^1/3.
(BC Punmia P. 670).

Akshay Kumar P said: (Feb 25, 2020)  
Laceys regime equation is 1/n(r^3/4s^1/3).

10.8r^2/3s^1/3 is laceys theroy.

Bhagabat Maity said: (Oct 15, 2020)  
Agree, @ Priya.

Option D is correct.

Prince said: (Aug 7, 2021)  
There are 2 equations:

Lacey's regime velocity: v = 10.8 R^2/3 S^1/2.
Lacey's non-regime velocity: v = 1/Na R^3/4 S^1/2.
So, the answer should be D.

Saqib said: (Sep 18, 2021)  
@Prince

There are 2 equations:

Lacey's regime velocity: v = 10.8 R^2/3 S^1/3.
Lacey's non-regime velocity: v = 1/Na R^3/4 S^1/2.

Khattak said: (Sep 22, 2021)  
It should be R^3/4 S^1/2.

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