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.
See also Capillary fringe – Subsurface layer in which groundwater seeps up from a water table by capillary action. Infiltration (hydrology) – Process by which water on the ground surface enters the soil. Phreatic – Term used in several scientific disciplines Phreatic zone – Zone in an aquifer below the water table. Vadose zone – Unsaturated aquifer above the water table.
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