Abstract
A numerical method of analyzing unsteady, unsaturated flow in soils is presented. If the hydraulic and capillary characteristics of the soil and the initial moisture condition are known, the method permits prediction of the future disposition of soil moisture as a function of time and location. The technique is particularly adaptable to problems of infiltration, drainage, and upward flow induced by evaporation. Effects of hysteresis and vapor movement are neglected. Darcy's law is combined with the continuity principle, and a solution is achieved through a step-by-step numerical procedure. Soil moisture profiles are obtained from a digital computer. Though at the present stage of development the method is applicable only to idealized soils, it is anticipated that further research will permit its application to field conditions.
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