Brooks-Corey correlation

where

$//<![CDATA[ \begin{array}{l}s_{wn} = \frac {s_w - s_{wс}}{1-s_{wс}}\end{array} //]]>$ – normalised water saturation,

$//<![CDATA[ \begin{array}{l}s_{wс}\end{array} //]]>$ – critical water saturation,

$//<![CDATA[ \begin{array}{l}a, \lambda\end{array} //]]>$ – model parameters which are set for laboratory data on capillary pressure and/or on resistivity water saturation during SHF.

Model parameter  $//<![CDATA[ \begin{array}{l}\lambda\end{array} //]]>$ is related to the the size of the pore size distribution.

The most popular value is 2 but it can vary to smaller or higher values.