This relation was derived by M. King Hubbert, who wrote essays on its interpretation, and a structural model of it is given by Jacob Bear.
This relation was derived by M. King Hubbert, who wrote essays on its interpretation, and a structural model of it is given by Jacob Bear. This statement can be extended by adding the Brinkman correction term to satisfy boundary conditions, and an additional term was added to it by the Forchheimer Equation to account for increased pressure drop. When combined with the continuity equation, it provides the basis for a derivation of Laplace's equation. Discovered using two mercury-filled u-tube manometers in an 1856 experiment, it demonstrated that rate of flow is proportional to change in head rather than change in pressure across the column. This equation predicts high flux per unit time for ►well-sorted gravels, and is often applied to aquifers. FTP, name this simple law of hydro-geology describing flow through a porous medium, named for a French guy who has an equation with Weisbach.  
This relation was derived by M. King Hubbert, who wrote essays on its interpretation, and a structural model of it is given by Jacob Bear.
Darcy's Law