[case] VermaPruessModel

Verma-Pruess equation [41].

\[ k = k_0 \left( \frac{\phi - \phi_c}{\phi_0 - \phi_c} \right)^n, \]

where \(k\) is the permeability, \(k_0\) is the initial permeability, \(\phi\) is the porosity, \(\phi_0\) is the initial porosity, \(\phi_c\) is the critical porosity, and \(n\) is the exponent.

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