A stratified soil deposit has three layers of thicknesses : z1=4,z2=1,z3=2 units and the corresponding permeabilities of k1=2,k2=1andk3=4 units, respectively. The average permeability perpendicular to the bedding planes will be
A
4
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B
2
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C
8
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D
16
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Solution
The correct option is B 2 kev=z1+z2+z3z1k1+z2k2+z3k3