Problem 5. Water flows in a rectangular open channel through a width constriction. If the upstream depth is y₁ = 5 ft when the flow is 300 cfs, what is the minimum width, Bmin that will prevent yi from exceeding 5 ft? Neglect head losses. 10 ft Bmin

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Water is flowing in a rectangular channel with a bed slope of 0.0005 ft/ft. The channel width is 10 ft amd the discharge is 300 cfs. Now supose that the depth at a given place in the channel is observed to be 6 ft, and the septh observed at a spot 1000 ft downstream is observed to be 4.5 ft. Estimate the manning n cofficient of this channel.

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