Darcy’s law

   An empirical law given as which states that the average volumetric discharge of flow through a porous medium is directly proportional to the hydraulic gradient assuming that the flow is laminar and inertia can be neglected.
   Note: Q=discharge, K=hydraulic conductivity, A=cross-sectional area, dh/ dL=gradient, and a minus sign is attached as a convention to indicate that flow occurs in the direction of decreasing head [5].

A Lexicon of Cave and Karst Terminology with Special Reference to Environmental Karst Hydrology. . 2002.

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