Résumé
The Lez aquifer (Montpellier, France) developed in aMediterranean setting, through several stages.Problem : The Messinian crisis is considered as mainly havingdriven the architecture of the karst conduits.Questions : Is this stage the most important in terms ofimpact on Lez aquifer architecture, and how does it comparewith the previous stages?Tools : To answer to these questions, a numerical model(GODIAG, TOTAL S.A.) has been constructed for the Lezaquifer. It allows to test several scenarii of the evolution of thekarstic network through time.