Leakance:
The ratio K'/b', in which K' and b' are the vertical hydraulic conductivity and the thickness, respectively, of the confining beds (Lohman and others, 1972). (2) The rate of flow across a unit (horizontal) area of a semipervious layer into (or out of) an aquifer under one unit of head difference across this layer (Bear, 1979). Synonymous with coefficient of leakage.
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