Abstract : The ain of the study of the Mémises massif (Prealeps Médians Plastiques Chablais - France) is to identify the possible hydrogeologic relations between the Memises massifs ( bed rock and the quaternary deposits) and the plateau Gavot. The fisrt part of the memory is connected with the geological studies; the record one, to the hydrological and hydrogeologyical research's.
The south-western part of the Mémises Massif is made of tilted blocks, N20°E SW dip, normal and listric faults separated. Microstructural analysis demonstrate these structures synchronous with the aberady know folded structures and the numerical results completely fit with the known regional stress fields (σ1 directed N160°E horizontal and σ3 horizontal too). They are also in good agreement with the previous results made in the Prealpes Romandes.
The structural and lithological parameters accredit the following possible circulation net:
- From to W-E, from the Mont-Bénant - Mémises Massifs;
- From N to S and from S to N relatively to the listric faulting.
Such hypothesis war tested, from February 2005 - January 2006. First were done the delimitation of the different; 2 weather stations and 5 limnimetric stations were set up. The water balances of the BV are quite balanced. At the best, the BV can take part in the food of the aquifers of the Plateau Gavot only within the error margin of the balance, i.e up from 15 to 20 L.s-1).
Lastly, the chemical tracings and the δ18O contents in water (springs, drillings) reveal the W to E flows within the karstic net to the south-western part of the Mémises Massif; E to W along the Bénant faults.
Finally, there results confirm the Danone Eaux France safeguard water politics of the Plateau Gavot area.