Epiphreatic zone

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.

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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 phreatic or saturated zone (Source: United States Geological Survey )