A stratum of soil consists of three layers of equal thickness. The permeabilities of top and bottom layers are $K = 10^{- 4} c m / s$ and that of the middle layer is $K = 10^{- 3} c m / s$ . Then the value of the horizontal coefficient of permeability $K_{H}$ for the entire soil layers is

- 1
  
  $2 x 10^{- 3} c m / s$
- 2
  
  $4 x 10^{- 4} c m / s$
- 3
  
  $3 x 10^{- 4} c m / s$
- 4
  
  $1.5 x 10^{- 4} c m / s$

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