Zone of Aeration 3 : The portion of the ground from the Earth's surface down to the water table: the zone of aeration is not saturated with water because its pores are filled partly by air and partly by water
EESiFlo North America, Terminology and Glossary: Water Terminology, Pennsylvania, USA 2002. flowmeterdirectory.com/flowmeter_terminology, (Wtr - Amer) {580}