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La moyenne annuelle des niveaux piezometriques de 27 puits est representative de l'impact annuel du climat sur les ressources en eaux souterraines du bassin du Bani (Douna, 101 600<space>km 2 ). Les variations du niveau de la nappe sont bien correlees avec les variations de pluie, et les annees d'etiage nul a Douna correspondent aux niveaux de nappe les plus bas de la serie de 15 annees...