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specific situation, only the wetting phase may need to be considered, (e.g., the Richards equation), or the NWP Effective hydraulic properties of porous media such as the capillary is considered additionally. pressure-saturation relation and the hydraulic conductivity functionClearly, the constitutive relations are a direct manifesare a direct manifestation of the underlying pore geometry. The porous tation of the complicated geometry of the underlying structure of a macroscopically homogeneous porous medium (sintered glass) was measured in detail using X-ray microtomography. We invessimple and uniform surface properties. Following such J. Tö lke and M. Krafczyk, Institute for Computer Applications in Civil a path to determine hydraulic material properties is Engineering, TU Braunschweig, Pockelsstr. 3, 38106 Braunschweig, attractive, since structure is directly observable. Con-Germany.

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