Civil Engineering - GATE Exam Questions - Discussion

4. 

Water emerges from an ogee spillway with velocity 13.72 m/s and depth = 3.0 m at its toe. The tail water depth required to form a hydraulic jump at the toe is

[A]. 6.48 m
[B]. 5.24 m
[C]. 3.24 m
[D]. 2.24 m

Answer: Option C

Explanation:

No answer description available for this question.

Rakesh Kumar said: (Jan 13, 2017)  
Can anyone explain this?

Hitesh said: (Jan 9, 2018)  
Answer should be 9.8m as per calculation.

Savy said: (Mar 15, 2018)  
9.34 m is the answer.

Noni said: (Sep 30, 2018)  
How do you calculate? Explain.

Sangay Tenzin said: (Oct 2, 2018)  
I also got 9.334.

y2/y1 = 1/2*(√(1+8.F1^2) - 1)
y1 = depth of water before hydraulic jump
y2 = depth of water after hydraulic jump
F1 = froude number of flow before hydraulic jump i.e F=V/√(g*depth) = 13.72/(√(9.81*3)) = 2.52.

y2 = 3* [1/2*( sqrt(1+8*2.52^2) - 1)].
y2 = 9.334m.

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