What is the depth of flow after the hydraulic jump?

Question

A sluce gate discharges water into a horizontal rectangular channel with a velocity of 12 m/s and depth of flow of 1m. What is the depth of flow after the hydraulic jump?     

(a) 6.42m                     (b) 5.84 m

(c) 4.94 m                    (d) 2.21m