Define unsaturated soil properties to model the effects of suction on shear strength and deformation. Utilize various single effective stress methods and unsaturated shear strength parameters to simulate realistic soil behavior under varying moisture conditions.

The natural variation of hydraulic properties can be incorporated, instead of assuming homogeneity over a region. In seepage analyses, properties such as permeability, water content, and degree of saturation can be defined as functions of volumetric strain, stress, and geometric location to more accurately simulate seepage behavior.