GATE Civil Engineering
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A trapezoidal channel is $10.0$ m wide at the base and has a side slope of $4$ horizontal to $3$ vertical. The bed slope is $0.002$. The channel is lined with smooth concrete (Manning’s $n=0.012$). The hydraulic radius (in m) for a depth of flow of $3.0$ m is

  1. $20.0$
  2. $3.5$
  3. $3.0$
  4. $2.1$
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