Water flows in a rectangular concrete channel 9.5 ft wide and 9 ft deep. The channel invert has a slope of 0.10% and the applicable n value is 0.013.The flow carried by the channel is 189 cfs. At an intersection of this channel with a canal, the depth of flow is 7.1 ft. Find the distance upstream to a point where normal depth prevails. Plot the surface profile.
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