By Jila Ghomeshi

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It is possible that all these factors can actually reduce hydraulic conductivity in the medium. In the applied-geology field, in order to determine the hydraulic conductivity of a rock mass, the joint roughness becomes crucial only if the height of asperities is relevant when compared to the joint aperture. 033, corresponding to inertial flow. L. Scesi, P. V. 1 Effects of Roughness on Hydraulic Conductivity of a Single Joint: Theoretical Analysis Bandis et al. (1985) proposes thefollowing empirical relation (Fig.

Then, the quantitative evaluation of the hydrogeological parameters is possible using modelistic approaches of mass transport. g. , 1960). To determine the hydrogeological parameters in “double-porosity” aquifers the Kazemi method (1980) is generally used. The test is valid if the following conditions are present: • the aquifer is confined and of almost infinite areal extent; • the thickness of the aquifer is uniform over the area that will be influenced by the test; • the well fully penetrates a fracture; • the well is pumped at a constant rate; • the piezometric surface is horizontal over the area that will be influenced by the test; • a geometric schematization of the fracture system is possible (Fig.

2004). 3 Probabilistic Methodologies: Percolation Theory Some authors (Shante and Kirkpatrick, 1971; Gueguen and Dienes, 1989) developed a so-called percolation theory to calculate the hydraulic conductivity starting from structural data. According to that theory, single discontinuities in rock masses are assimilated to bonds with finite length, whose hydraulic conductivity is a function of the aperture, whereas their intersections create the “percolation site”. In this way, the real extension of the discontinuity inside the rock mass (persistence) can be considered.

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