Given that g= acceleration due to gravity and R= hydraulic mean depth, the Darcy-Weisbach friction factor is related to Manning's rugosity coefficient 'n' as

- 1
  
  $\frac{8 g n^{2}}{R^{1 / 3}}$
- 2
  
  $\frac{g n^{2}}{8 R^{1 / 3}}$
- 3
  
  $\frac{64 n g}{R^{1 / 3}}$
- 4
  
  $\frac{R^{1 / 3}}{8 g n^{2}}$

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