Infiltration in Layered Systems Sample Clauses

Infiltration in Layered Systems. The previous discussions related to Xxxxx’x Law and the Green Ampt approximation have focused on homogeneous soils. Infiltration into layered systems can also be described with Xxxxx’x law, with hydraulic conductivity and gradients changing from layer to layer. For infiltration at a site with a higher conductivity layer overlaying a layer of lower conductivity, the top layer initially controls the infiltration rate. When the wetting front reaches the less conductive layer, the infiltration rate will drop, and the rate of infiltration will be controlled by the less conductive layer (Chow et al., 1988). After a sufficient time, a positive pressure head in the form of a perched water table (mound) can develop above the lower conductivity soil. Ponding, or mounding, results in a head gradient of less than 1.0, much the same way as when the wetting front reaches the water table. The shape and growth of the mound depends on the infiltration rate, the dimensions of the infiltration area, and the hydraulic characteristics of the soil (Xxxxxxxx, 1994).
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