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[en] Studies of methodological nature have been made on three types of aquifers. The first, a non-confined aquifer, is situated in southern France on the left bank of the Rhône in the Crauz plain. Tritium, carbon-14 and uranium were used together with the routine chemical analyses of water. The second aquifer is situated to the east and southeast of Paris, in a rather peculiar formation. The aquifer is confined in some places and non-confined in others; it is typically karstic at some places. The situation is complicated and the results of carbon-14 and tritium are both very interesting and useful. The third aquifer is the great sedimentary basin of Aquitaine. It is confined and has depths ranging between 100 and 550 meters.