International Commission on Irrigation & Drainage Commission Interationale des Irrigation et du Drainage



(979) Zone of aeration, Aeration zone, Zone of suspended water, or Unsaturated zone
That portion of the lithosphere in which the functional interstices of permeable rock or earth are not (except temporarily) filled with water under hydrostatic pressure; that is, the interstices are either not filled with water or are filled or partly filled with water that is held by capillarity. The zone of aeration comprises the area where fringe water, intermediate water, and groundwater may be found.

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