3. Water flows under a sluice gate in a horizontal rectangular channel of 2 m wide. If the depths of flow before and after the gate are 4 m and 0.5 m. (a) Calculate the flow discharge in the channel. (b) Compute the downstream depth of the hydraulic jump occurring after the gate. y₁-4 m V b=2 m y3 y2=0.50 m 2) 3