Question: A channel has a rectangular cross section, a width of 4 0 m , and a flowrate of 4 0 0 0 m 3 /

A channel has a rectangular cross section, a width of 40 m, and a flowrate of 4000 m3/s. The normal water depth is 20 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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