In flood stage a natural channel often consists of a deep main channel plus two floodplains, as in Fig. P10.35. The floodplains are often shallow and rough. If the channel has the same slope everywhere, how would you analyze this situation for the discharge? Suppose that y1 = 20 ft, y2 = 5 ft, b1 = 40 ft, b2 = 100 ft, n1 = 0.020, n2 = 0.040, with a slope of 0.0002. Estimate the discharge in ft3/s.

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