The discharge per metre width at the foot of a spillway is $10 m^{3} / s$ at a velocity of 20 m/s. A perfect free hydraulic jump will occur at the foot of the spillway when the tail water depth is approximately equal to

- 1
  
  4.50 m
- 2
  
  5.00 m
- 3
  
  5.50 m
- 4
  
  6.50 m

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