Abstract
This investigation aims to determine the hydraulic conductivity of the carbonate reservoir of SW limb of M. Nerone (Umbria-Marche Apennines) and to identify the patterns of groundwater circulation by using the Kiraly structural-geological method.The results show how the highest values of hydraulic conductivity (kmax ≈ 10-3 m/s) are linked to Calcare Massiccio Formation in the middle portion of karst aquifer, whereas the main direction of conductivity vectors is oriented toward about N210° (SSW).The effective infiltration calculated in the Giordano basin is about 118 l/s, a value rather higher than the mean discharge of the related karst spring (about 70 l/s). This discrepancy seems to be linked at the variation of some structural parameters (like the aperture sizes) with the depth. Therefore, the Kiraly method is a valid approach for estimating hydraulic conductivity values of the rock masses, but only if a shallow geological model is taken into account. For greater depths, method suffers strong limitations.
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