74 A new concept of karst development based on hydrogeology and geophysics blocks was defined based on the stratigraphic interpretation of each borehole and on the identification of discontinuities between depositional sequences (Gaillard, 2026). Figure 13 presents the results obtained from the pumping tests conducted at the HES site with AQTESOLV software. In the fracture medium, the hydraulic conductivity (K) appears to be homogeneous, with values ranging between 10–⁴ and 10–⁵ m/s. The specific storage (Ss) of the fractures varies between 10–⁶ and 10–³ m–¹. This parameter depends on fracture aperture and infilling material, which is consistent with field observations (Fig. 9 and 10) and borehole data. In contrast, data for the matrix are more scattered. The matrix hydraulic conductivity is several orders of magnitude lower than that of the fractures, with values ranging from 10–⁶ to 10–⁹ m/s. The specific storage of the matrix blocks appears to lie between 10–⁵ and 10–⁴ m–¹, with the highest value reaching 4.10–⁴ m–¹. The fracture skin factor (Sf) varies from 0 to 3, while the flow dimension (n) ranges between 1.5 and 2. Figure 12 Pumping test at constant rate. © EDF 2024: these data are the property of EDF; any use is subject to EDF’s prior agreement.
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