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A very long trapezoidal channel has a b = 20 ft, z = 5, S =...

  1. A very long trapezoidal channel has a b = 20 ft, z = 5, S = 0.002 and n = 0.035. The steady state flow rate is 700 cfs. The channel terminates at a dam with a measured water surface depth of 10 feet. 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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