U radu su izneseni rezultati hidroloških analiza krške rijeke Dobre. Tok rijeke Dobre podijeljen je ne tri djela. Tok Gornje ili Ogulinske Dobre dug je 51,2 km. Rijeka ponire u  Đulinom ponoru koji se nalazi u samom gradu Ogulinu. Drugi dio, tj. podzemni tok rijeke Dobre, protječe kroz do danas otkriveni sustav krških kanala i kaverni dug 16.396 m, te na površinu izbija kod sela Gojak kroz niz stalnih i povremenih krških izvora. Udaljenost zračnom linijom između Đulinog ponora i sustava izvora je 4,6 km. Treći dio pod nazivom Donja Dobra s ušćem u rijeku Kupu dug je 52,1 km. Prirodni režim rijeke Dobre značajno je poremećen izgradnjom hidroelektrane Gojak koja je započela s radom 1959. godine. Posljedica toga je povećanje prosječnih srednjih protoka Donje Dobre na vodomjernom profilu Trošmarija nizvodno od HE Gojak od prirodnih 13,6 na 28,3 m3/s. U članku su detaljno analizirani hidrološki nizovi mjereni na 9 stanica (pet na Gornjoj i četiri na Donjoj  Dobri)..; The paper publishes the results of the hydrological analysis for the karst river Dobra. The flow of the Dobra River is divided into three parts. The Upper Dobra, or the Ogulin Dobra, is 51.2 km long. The river sinks in the Đula's sinkhole (ponor), which is located in the town Ogulin itself. The second part, i.e. the underground stretch of the Dobra, flows through the system of karst channels and caverns in the length of 16,396 m as discovered to date and resurfaces near the village Gojak as permanent or temporary karst springs. The aerial distance between the Đula sinkhole (ponor) and the spring system is 4.6 km. The third part, the Lower Dobra, including its confluence with the Kupa River, is 52.1 km long. The natural regime of the Dobra River was significantly disturbed by the construction of the hydropower plant (HPP) Gojak, whose operation started in 1959. The consequence has been an increase in the average mean discharges of the Lower Dobra at the gauging profile Trošmarija downstream of the HPP Gojak from the natural 13.6 to 28.3 m3/s. The paper analyzes in detail the hydrological series measured at 9 stations (5 on the Upper Dobra and 4 on the Lower Dobra).