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According to Manning's formula, the discharge through an open channel is (where M = Manning's constant)

A x M x m1/2 x i2/3
A x M x m2/3 x i1/2
A1/2 x M2/3 x m x i
A2/3 x M1/3 x m x i

Correct Answer: A x M x m2/3 x i1/2

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