Abstract: The subject of the hydrology of Jaševica stream in default profile Tomići 1 is addressed in this graduate work. The previously mentioned area and its main features were defined on the topographic basis in scale of 1:25000. In the analyzed basin Jaševica no previous meteorological and hydrological measurements were taken. The input data that was used for calculations is the data for meteorological station Sisak provided by DHMZ and data from hydrological station Gvozd on the stream Trepča. The processing of meteorological data consists of average annual precipitation, defining the maximum intensity of precipitation of different return period for different periods of rain, PTP curve. The data used in the hydrological data processing are – from hydrological sense similar to the catchment area of Trepča stream – on the basis of which were determined: runoff coefficient, average monthly and annual discharge, flow duration curves. High waters are determined by the maximum flow rates and hydrographs of isolated large water waves of different return periods. Maximum flows are determined on the basis of empirical expressions (Chow's method, Srebrenović formula for small catchment area and “four coefficients” formula). The hydrographs of isolated large water waves are determined by the method of R. D. Goodrich. Small waters are shown approximately, while the annual sediment transport is determined by the Fleming formula. Finally, general conclusions are drawn about the water regime of Jaševica stream.