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7.11. A rectangular channel with n = 0.012 is 5 ft wide and is built on a slope of0.0006 f/ft. At point a, the flow rate is 60 cfs and

y, = 3 ft. Using one reach,find the distance to point b where y, = 2.5 ft and determine whether this point is upstream or downstream of point a.

Fig: 1