Thisspecialsection of Vadose Zone Journal considers uncertainty in vadose zone flow and transport prediction. The recent emergence of this topic is a consequence of a major change in the motivation for predictive modeling in the vadose zone. Until the 1980s, predictive modeling of vadose zone flow and transport was focused mostly on relatively applied problems in soil science and agricultural engineering. Since that time, the discipline has expanded to include the vastly different problem of groundwater protection, where applications often involve complex geologic environments that include heterogeneous unconsolidated materials (Fig. 1) and fractured rock (...

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