Isopièzes en mNGF (courbes de niveau correspondant aux altitudes de la nappe) de l'aquifère tertiaire du bassin de Rennes en octobre 1975 (période de basses eaux).
Référence bibliographique : L. BRUNEL (1976) - Bassin tertiaire de Bruz-Chartres - Rapport BRGM 76-SGN-443-BPL.
Pour obtenir plus de détail consulter l'article : http://sigesbre.brgm.fr/Cartes-piezometriques-215.html
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