Water flows in a channel whose bottom slope is 0.002 and whose cross section is as shown in Fig. P13–60. The dimensions and the Manning coefficients for the surfaces of different subsections are also given on the figure. Determine the flow rate through the channel and the effective Manning coefficient for the channel.

FIGURE P13–60

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1 2 m 1.5 m 1 6 m 1 Concrete channel n₁ = 0.014 2m- 10 m (2) Light brush n₂ = 0.050