Abstract
Darcy's law, that the flow of water through porous materials increases directly as the hydraulic gradient, has been given much investigation. Investigations made in the Hydrologic Laboratory of the United States Geological Survey show that Darcy's law holds down to a gradient of two or three inches to the mile, and there are indications that it holds to less than one inch to the mile. On the basis of the work of Tolman and Poland it is evident that Darcy's law applies to the movement of ground-water under high gradients and high velocities except under very unusual conditions. It is now clear that Darcy's law applies to laminar flow, in which essentially no energy is lost in producing eddies.
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