Definition:
Aquifère, également appelé aquifère libre, dont la limite inférieure est un aquitard et dont la surface supérieure est libre. Sa limite supérieure est le niveau de la nappe, qui varie librement. L’eau d’un puits pénétrant dans un aquifère à nappe libre est à la pression atmosphérique et ne s’élève pas au-dessus du niveau de la nappe phréatique.
Source:
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Food and Agriculture Organization of the United Nations, AQUASTAT Web Site