The zone below the water table, composed of the shallow phreatic zone, deep phreatic (or bathyphreatic) zone and stagnant phreatic zone. Syn. phreatic zone.
The area below the water table where all open spaces are filled with water under pressure equal to or greater than that of the atmosphere.
The area below the water table where all open spaces are filled with water under pressure equal to or greater than that of the atmosphere.