A flow net constructed to determine the seepage through an earth dam which is homogeneous but anisotropic, gave 4 flow channels and 16 equipotential drops. The coefficients of permeability in the horizontal and vertical directions are $4 \times 10^{- 7}$ m/s and $1 \times 10^{- 7}$ m/s respectively. If the storage head is 20 m, then the seepage per unit length of the dam in $m^{3} / s$ , will be

- 1
  
  $5 \times 10^{- 7}$
- 2
  
  $10 \times 10^{- 7}$
- 3
  
  $20 \times 10^{- 7}$
- 4
  
  $40 \times 10^{- 7}$

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