A simplistic soil characteristics function.
This property must be a medium property. It computes the saturation of the wetting phase as function of capillary pressure.
The capillary pressure-saturation relationship given by S_{eff}=1-\left(\frac{p_{c}}{p_{c}^{max}}\right)^{\lambda}, where \lambda is an exponent, p_{c} is capillary pressure, p_{c}^{max} is the maximum capillary pressure at which S_{eff}=0.
This property can mainly be used for testing. If the exponent is set to 1, the characteristic curve shows a linear dependence.
Reference capillary pressure at which S_{eff}=0.
No additional info.
Used in no end-to-end test cases.