A trapezoidal channel with a bottom width of 20 ft, a slope of 0.0016, Manning’s n of 0.025, and side slopes of 2:1 (h:v) has a discharge of 500 cfs. An obstruction in this channel causes a backwater profile with a depth of 6.5 ft just upstream of the obstruction. What would be the depth of flow 200 ft and 400 ft upstream of the obstruction? How far upstream does the normal depth occur? Assume an energy coefficient of 1.1.
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