Abstract
As was pointed out originally by Slichter, the generalization of Darcy's law is nothing more nor less than the criterion for the existence of a velocity‐potential for the macroscopic velocity of moisture in the soil. If the velocity is eliminated from the equation of continuity for an incompressible fluid by means of the generalized Darcy equation, it leads immediately to Laplace's equation. It is evident, therefore, that if this law is to be relied upon any rational solution of problems in drainage and well‐construction must be based primarily upon this equation or the equations from which it is derived.
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