Definitions: Rock Property Fields

• Homogeneity: refers to uniform aquifer parameters (i.e. inhomogeneity is the norm in earth materials)
• Isotropy: refers to directional dependence of material properties. Usually only hydraulic conductivity is treated as anisotropic (directionally dependent). Anisotropy is described by giving values along the principal axes of an ellipsoid (e.g. the hydraulic conductivity ellipsoid, Fig. 3)