Water flows in a rectangular channel at a depth of y=1 ft and a velocity of V = 20 ft/s....

Water flows in a rectangular channel at a depth of y=1 ft and a velocity of V = 20 ft/s. When a gate is suddenly placed across the end of the channel, a wave (a moving hydraulic jump) travels upstream with velocity V_w as is indicated in Fig. P10.68. Determine V_w. Note that this is an unsteady problem for a stationary observer. However, for an observer moving to the left with velocity V_w, the flow appears as a steady hydraulic jump.