The Lika River has a torrential hydrological regime. In this paper a case of very special hydrological behaviour of two neighbouring sinking karst rivers, Lika and Gacka, (Dinaric karst of Croatia), is analysed. Paper analyzes in detail the hydrological series measured at 9 stations (5 on the Upper Dobra and 4 on the Lower Dobra). The Lower Dobra at the gauging profile Trošmarija downstream of the HPP Gojak from the natural 13.6 to 28.3 m3/s. The consequence has been an increase in the average mean discharges of (HPP) Gojak, whose operation started in 1959. The natural regime of the Dobra River was significantly disturbed by the construction of the hydropower plant The third part, the Lower Dobra, including its confluence with the Kupa River, is 52.1 The aerial distance between the Đula sinkhole (ponor)Īnd the spring system is 4.6 km. Near the village Gojak as permanent or temporary karst springs. the underground stretch of the Dobra,įlows through the system of karst channels and caverns in the length of 16,396 m as discovered to date and resurfaces Sinkhole (ponor), which is located in the town Ogulin itself. The Upper Dobra, or the Ogulin Dobra, is 51.2 km long. The paper publishes the results of the hydrological analysis for the karst river Dobra.
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