The critical state of flow in a non-rectangular channel is expressed by

- 1
  
  $y_{c} = {(\frac{q^{2}}{g})}^{1 / 3}$
- 2
  
  $\frac{Q^{2}}{g} = \frac{A^{3}}{T}$
- 3
  
  $\frac{Q^{3}}{g} = \frac{A^{2}}{T}$
- 4
  
  $\frac{Q^{2}}{g} = \frac{A}{T^{3}}$

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