Question: A channel has a rectangular cross section, a width of (40 mathrm{~m}), and a flow rate of (4000 mathrm{~m}^{3} / mathrm{s}). The normal water depth

A channel has a rectangular cross section, a width of $40 \mathrm{~m}$, and a flow rate of $4000 \mathrm{~m}^{3} / \mathrm{s}$. The normal water depth is $20 \mathrm{~m}$. The flow then encounters a 4.0-m-high dam. Find the water depth directly above the dam if the flow is critical. Assume frictionless flow.

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