Deep aquifer network in the sandstone basin of the south-west of Germany.

The sandstone basin of the south of Germany is an area where the geothermic exploitation is intensive. The well-working of these equipments require good attainments about the quantities of available water in the aquifer stratum and about the geothermic conditions. That is the reason why the west part of the basin has been largely prospected for almost twenty years. Hydraulic, hydrochimic and isotopic studies have shown that two circulation zones have to be differentiated. Very different replacement conditions are represented in the latter. The possibilities of geothermic exploitations are determined by the ratio of the paleopleistocene aquiferous stratum and of the recently formed one. This study handles above all with the results of the hydrochimic and isotopic exams and with the issue of the renewal of the aquiferous stratum. The possible consequences for the future use of the stratum will be outlined.