Many models of varying degree of complexity and dimensionality have been developed during the past several decades to quantify the basic physical and chemical processes affecting water flow and pollutant transport in the unsaturated zone. These models are now being used increasingly for a wide range of applications in research and management of natural subsurface systems. Modeling approaches range from relatively simple analytical and semianalytical models to more complex numerical codes that permit consideration of a large number of simultaneous nonlinear processes. While analytical and semianalytical solutions are still used for relatively simple applications, the ever-increasing power of personal...

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