Consider uniform flow through an open channel lined with bricks with a Manning coefficient of n =

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Consider uniform flow through an open channel lined with bricks with a Manning coefficient of n = 0.015. If the Manning coefficient doubles (n = 0.030) as a result of some algae growth on surfaces while the flow cross section remains constant, the flow rate will 

(a) Double, 

(b) Decrease by a factor of √2, 

(c) Remain unchanged, 

(d) Decrease by half, 

(e) Decrease by a factor of 21/3.

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