133 © EDP Sciences, 2026 DOI: https://doi.org/10.1051/978-2-7598-3934-6.c007 QUAL I TÉ GÉOPHYSIQUEAPPLIQUÉE 7 Hydrogeological flow logging and dye tracer tests on the Hydrogeological Experimental Site of Poitiers University (France) A. Boulais, T. Gaillard and H. Geairon Introduction Karst may be defined as a network of conduits that enable groundwater transfer. Conduit dimensions range from centimetres to meters. Karst systems are organized around the connectivity of different types of voids: the primary porosity of the host rock, fissure porosity, and dissolution voids produced by karstification of carbonates. At the regional scale, karst voids are typically smaller in volume than fissures and pores. Mangin (1975), based on drainage analyses of systems studied at the Moulis laboratory (France), concluded that karst voids account for only a very small fraction of the limestone massif—on the order of 0.2%. This estimate has been supported by data from various karst systems compiled by Worthington (2003).
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