We propose to study a karstic aquifer by using tiltmeter observations from the underground geodetic station of Bus de la Genziana (1000VTV) located in the Natural Hypogeum Reserve in Cansiglio (Eastern Veneto, Italy). The location of this cavity, situated in a known seismic zone on the Cansiglio Plateau in Fregona (Treviso), completes the network of tiltmeters stations of the Department of Earth Sciences (DST), University of Trieste. The network includes two further stations in Friuli Venezia Giulia (Grotta Gigante in Trieste and Grotta Nuova of Villanova in Tarcento, Udine). All the stations are set in a natural cavity that is part of an area of particular hydro-geologic importance. In the specific case of the Cansiglio-massif, the River Livenza springs at its foot-slopes. By means of comparison of the observed tilt-signal recorded in the Genziana station with the pluviometrical records provided by ARPA Veneto, local hydrologic effects have been recognised and interpretations have been proposed. The purpose of this talk is to open a new multidisciplinary frontier between the geodetic studies and the karstic system to obtain a more complete geodetic description.