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An anisotropic soil deposit has coefficient of permeability in vertical and horizontal directions as k_z and kₓ, respectively. For constructing a flow net, the horizontal dimension of the problem’s geometry is transformed by a multiplying factor of

1. √(k_z/kₓ)
2. √(kₓ/k_z)
3. kₓ/k_z
4. k_z/kₓ

Correct answer: √(k_z/kₓ)

Solution

To draw an isotropic flow net for anisotropic soil, the horizontal dimensions are scaled by the factor sqrt(k_z/k_x) (transformed x = x*sqrt(k_z/k_x)). The stored answer sqrt(kx/kz) is the reciprocal; the correct multiplying factor is sqrt(k_z/k_x).

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