$10\mathrm{.}6\mathrm{.}8$ WP Water flows in a rectangular channel with velocity $V=6\frac{m}{s}.$ A gate at the end of the channel is suddenly closed so that a wave $($a moving hydraulic jump$)$ travels upstream with velocity $V_w=2\frac{m}{s}.$ Determine the depths ahead of and behind the wave. 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.