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A stable channel is to be designed for a discharge of Q m3 /s with silt factor f as per Lacey's method. The mean flow velocity (m/s) in the channel is obtained by

(Qf2/140)1/6
(Qf/140)1/3
(Q2f2/140)1/6
0.48 (Q/f)1/3

Correct Answer: (Qf2/140)1/6

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