Earth:Epiphreatic zone

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Short description: Zone between the saturated and unsaturated zones
Cross section showing the water table varying with surface topography as well as a perched water table
Cross-section of a hillslope depicting the vadose zone, capillary fringe, water table, and the phreatic or saturated zone. (Source: United States Geological Survey.)

In a cave system, the epiphreatic zone or floodwater zone is the zone between the vadose (unsaturated) zone above and phreatic (saturated) zone below. It is regularly flooded and has a significant porosity. It has a great potential for cave formation.[1]

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References