For an anisotropic soil, premebilities in x and y directions are $K_{x} a n d K_{y}$ respectively in a two dimensional flow. The effective permeability $K_{e q}$ for the soil is given by:

- 1
  
  $K_{x} + K_{y}$
- 2
  
  $K_{x} / K_{y}$
- 3
  
  ${({K_{x}}^{2} + {K_{y}}^{2})}^{1 / 2}$
- 4
  
  ${(K_{x} K_{y})}^{1 / 2}$

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