A rectangular channel with n = 0.018 and a constant slope of 0.0025 increases its width linearly from b to 2b over a distance L, as in Fig. P10.106
(a) Determine the variation y(x) along the channel if b = 4 m, L = 250 m, y
(0) = 1.05 m, and Q = 7 m3/s.
(b) Then, if your computer program is working well, determine y(0) for which the exit flow will be exactly critical.

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2b