ABSTRACT
Movement of water in the vadose zone (i.e., the variably saturated zone above the regional ground-water table) is of considerable interest in studies of landfill and hazardous waste sites, ground-water recharge investigations, irrigation management, and civil engineering projects. Many of these studies have relied on soil water content measurements which are useful for many purposes. However, evaluation of the energy status of the soil water in the vadose zone is necessary for defining the direction of water and contaminant movement, and studying the soil-water-plant relationship.
