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Note on the spring region of Gacka River (Croatia)

We present the first results of a study of the Gacka River spring area, an important Croatian drinking water resource. Stable isotope data (obtained at the Stable Isotope Laboratory SILab in Rijeka) are used in combination with hydrological and meteorological data. The δ18O values give information on the mean catchment altitudes of the three main springs of Gacka River (Majerovo vrelo, Tonkovića vrelo and Pećina). Hydrological, meteorological and stable isotope data indicate good mixing of infiltrated and ground waters. The precipitation d-excess shows a seasonally varying influence of continental and maritime air masses. †Revised version of a paper presented at the 9th. Symposium of the European Society for Isotope Research (ESIR), 23 to 28 June, Cluj-Napoca, Romania.