DEFINITION OF DARCY’S LAW

A formula that describes the flow of fluids

through porous media, assuming laminar flow and that the

effects of inertia are negligible. The law states that the velocity

of the flow is proportional to the pressure gradient multiplied

by the ratio of permeability times density, divided by

the viscosity of the fluid. Mathematically, Darcy’s Law may

be expressed simply as V=kS, where V is the velocity of the

flow, k is the coefficient with the same units as velocity, and S

is the slope of the hydraulic gradient.

See also HYDROLOGY.

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