|Permeability of Stratified Deposits||
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When a soil deposit consists of a number of horizontal layers having different permeabilities, the average value of permeability can be obtained separately for both vertical flow and horizontal flow, as kVand kH respectively.
Consider a stratified soil having horizontal layers of thickness H1, H2, H3, etc. with coefficients of permeability k1, k2, k3, etc.
Let i be the equivalent hydraulic gradient over the total thickness H and let the hydraulic gradients in the layers be i1, i2, i3, etc. respectively.
where kV = Average vertical permeability
The total head drop h across the layers is