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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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979. Zone d`aération : Partie de la lithosphère, où les interstices effectifs de la roche ou de la terre perméables ne sont pas remplis (sauf temporairement) d`eau sous pression hydrostatique, c`est-à-dire que les interstices sont soit remplis ou non d`eau, soit remplis partiellement d`eau retenue par capillarité. La zone d`aération est la zone où les eaux de la frange capillaire, de la zone transitoire et de la nappe phréatique peuvent se trouver.

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