Permeability (2) - Permeability Permeability is...

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Permeability Permeability is characterized by the filtration coefficient k. Determination of permeability is based on Darcy's filtration law, which expresses the relation between the seepage q, the total cross-section area A and the hydraulic gradient i. Seepage through a sample is defined from the formula where hydraulic gradient, i.e. the difference between the levels of total heads H to the path L which a water particle must travel through the soil. Diagram of steady flow through a sample (Darcy law) We may, therefore, say that permeability is a property of soil consisting in letting in water through its pores and voids due to hydraulic gradient. The filtration coefficient is calculated from the formula where v is filtration velocity in m.s -1 . Determination of permeability The methods of filtration coefficient determination may be split into several main groups: Laboratory measurement Field testing 1
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Permeability determination from empirical formulae
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