# Civil Engineering - Irrigation - Discussion

### Discussion :: Irrigation - Section 3 (Q.No.47)

47.

Lacey's equation for calculating flood discharge in rivers, is

 [A]. V = 10.8 R1/2 S1/2 [B]. V = 10.8 R2/3 S1/2 [C]. V = 10.8 R2/3 S1/3 [D]. V = 10.8 R1/3 S2/3

Explanation:

No answer description available for this question.

 Paras said: (Mar 26, 2017) I think, option B is correct.

 Sneha said: (Mar 28, 2017) Option B is right. I agree @Paras.

 Faisal said: (Jul 16, 2017) Yes, B is right.

 Jgj said: (Aug 18, 2017) Option B IS RIGHT.

 Prashant Mishra said: (Oct 3, 2017) Option B is correct.

 Nitesh Saini said: (Jan 12, 2018) Given option is correct don't get confused by s^1/2. Actually, it is used in manning equation in fluid mechanics and quid different from irrigation. Given option is correct. C.

 Ankit Mishra said: (Jan 22, 2018) C is the correct option.

 Bhagwat said: (May 7, 2018) C is correct. I agree with the given answer.

 Akshay said: (Jun 19, 2018) Option C is correct. I agree with the given answer.

 Bipin said: (Dec 6, 2018) C is the correct option. I agree with the given answer.

 Jeny said: (Apr 19, 2019) Yes, C is correct. I agree.

 Asli said: (Sep 4, 2019) Yes, option C is correct.

 Dhru said: (Nov 15, 2019) The three fundamental equations are: V = 0.639 √fR Where V is regime velocity in m/sec. Af2 = 141.2 V5(2) V = 10.8 R2/3 S1/3 ..(3) Where S is the slope of water surface.