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A very long rectangular channel has a b =5 ft, S = 0.001 and n =...

A very long rectangular channel has a b =5 ft, S = 0.001 and n = 0.015. The steady state flow rate is 250 cfs. This reach is connected to a steep reach on the downstream end. What is the point of control? Is the flow supercritical or subcritical? Calculate the water surface profile using the direct step procedure. What is the length of the channel?

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