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1(d). (6%) Find the friction slope, Sf, for a flow Q = 20 m/s in an open-channel of rectangular cross-section with a base width

1(d). (6%) Find the friction slope, Sf, for a flow Q = 20 m/s in an open-channel of rectangular cross-section with a base width b = 3 m and a depth of the flow y = 1.4 m. Use the Manning = coefficient n = = 0.014. b=3m y=1.4 m

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