_:b1216772 . _:b1216772 "web:http://wasg.iinet.net.au/terminol.html"^^ . _:b1216772 . _:b1216772 "Wikipedia:Phreatic_zone"^^ . _:b1216772 . _:b1216772 "A zone beneath the land surface in which all interstices are filled with water. Water in the phreatic zone has a hydraulic head greater than atmospheric pressure due to the weight of overlying groundwater."^^ .