The critical velocity for a flow of $q m^{3} / s e c / m e t r e$ width of a wide rectangular channel is given by

- 1
  
  ${(\frac{q^{2}}{g})}^{\frac{1}{3}}$
- 2
  
  ${(q g)}^{1 / 3}$
- 3
  
  $\sqrt{q g}$
- 4
  
  none of the above

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