Infiltration of Water into Nonuniform Soils

A significant and vital phase of the hydrological cycle is the entry and movement of water in the soil profile. In field situations, infiltration of rainfall or irrigation water is generally a case of water movement into soil profiles of nonuniform water content and hydraulic conductivity. The basis upon which one may calculate an infiltration rate into a layered profile is the approximate theory of Green and Ampt (1911), who presented three equations to describe the phenomenon of soil water movement in downward, upward, and horizontal directions.