Question: Water flows in a rectangular channel with velocity (V=6 mathrm{~m} / mathrm{s}). A gate at the end of the channel is suddenly closed so that

Water flows in a rectangular channel with velocity $V=6 \mathrm{~m} / \mathrm{s}$. A gate at the end of the channel is suddenly closed so that a wave (a moving hydraulic jump) travels upstream with velocity $V_{w}=2 \mathrm{~m} / \mathrm{s}$. 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.

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