Question 4.9 A rock consists of six layers of different permeabilities. The geometry of the rock is given in the figure below. The permeability and dimensions of each layer are given in the table below. a) Find the average permeability of this rock for horizontal flow (k,). b) Find the average permeability of this rock for vertical flow (k). c) What is the k /k,? 1 2 4 6 Layer Permeability [mD] Thickness [in] Length [in] Width [in]

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Field applications of hydraulic conductivity

Hydraulic conductivity is one of the hydraulic properties of soil defined as a measurement of the ability of a porous medium to permit water movement or fluid flow through it. It is denoted by the letter K. It is influenced by the density and viscosity of the fluid. It is also called permeability. Hydraulic conductivity is defined as the ratio of velocity to the hydraulic gradient. The different methods used to determine the hydraulic conductivity are laboratory methods (constant head permeability tests and falling head tests), in-situ field methods (pumping in and pumping out tests), small scale field tests (infiltration tests and slug tests), and indirect methods such as estimation from grain size, consolidation test data, and horizontal capillary test. The pedotransfer function (PTF) method is a specific empirical estimating approach employed in the soil sciences is also used to determine the hydraulic conductivity of the soil.