Assume a slope of 0.01 ft/ft and a hydraulic radius of 3 ft. Show the effect of each of Cowan’s adjustments for roughness by computing the velocity for the recommended values of n1. n2, n3, n4, and n5. For n2 through n5, assume n1 = 0.02. For n, through n4, assume n5 = 0.005. Where ranges are given, use an average value. Plot curves of velocity versus n for each of the five variables. What do the results suggest about the importance of the five variables?
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