81 © EDP Sciences, 2026 DOI: https://doi.org/10.1051/978-2-7598-3934-6.c004 QUAL I TÉ GÉOPHYSIQUEAPPLIQUÉE 4 The Hydrogeological Experimental Site of Poitiers University (France) T. Gaillard Origin of the hydrogeological experimental site (HES) In 1991, the French government decided to create a storage site for long-lived nuclear waste. After studying some thirty sites, three of them were selected for an underground laboratory: Bures (Meuse and Haute-Marne), Chasclan (Nord), and La Chapelle Bâton (Vienne). In the end, the Chapelle-Bâton site was not selected due to severe fracturing of the granite. However, the abandonment of this site enabled part of the Jurassic research program to be transferred to the Le Deffend site near Poitiers (Commune of Mignaloux Beauvoir) as part of the XIIth “Etat-Region” plan (CPER 2000-2006). The research objective, led by Gilles Porel and his team at the University of Poitiers, was initiated to experimentally test theories on fractured media in terms of flow, pollutant transport, and identification of hydrodynamic parameters (Bernard, 2005). The Poitiers Hydrogeological Experimental Site (HES) was then developed next to a botanical garden of Poitiers University (Le Deffend). The site covers 33 hectares,
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