For a given specific energy E, the critical depth $y_{c}$ for a rectangular channel is given by

- 1
  
  $y_{c} = \frac{3}{2} E$
- 2
  
  $y_{c} = \frac{2}{3} E$
- 3
  
  $y_{c} = \frac{4}{5} E$
- 4
  
  $y_{c} = \frac{3}{4} E$

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