The coefficient of velocity for an orifice is given by (using usual notations) -

- 1
  
  $\frac{x}{2 \sqrt{Y H}}$
- 2
  
  $\frac{2 x}{\sqrt{Y H}}$
- 3
  
  $\frac{x}{\sqrt{Y H}}$
- 4
  
  $\sqrt{\frac{x^{2}}{2 Y H}}$

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