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A rectangular open channel has a width of $5 \: m$ and a bed slope of $0.001$. For a uniform flow of depth $2 \: m$, the velocity is $2 \: m/s$. The Manning’s roughness coefficient for the channel is

  1. $0.002$
  2. $0.017$
  3. $0.033$
  4. $0.050$ 
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