The characteristics of the Bednja and Plitvica River basins are described in this paper. The theoretical foundations of hydrological and statistical concepts and correlation analyses between precipitation (P) and runoff (Q) are briefly explained. Runoff and precipitation data from meteorological stations were obtained by the Croatian Meteorological and Hydrological Service. A basic statistical analysis of data for period from 1990 to 2019 has been done. Runoff from hydrological stations and precipitation from meteorological stations downstream of hydrological stations were correlated between 2000 and 2019. The correlation between precipitation and runoff is shown in the dispersion diagrams and Pearson coefficient and coefficient of determination R² values were calculated. The mean absolute errors (MAE), mean square errors (MSE) and the root mean square errors (RMSE) were calculated. Based on the values and ranking of correlation coefficients according to Roemer-Orapska scale, correlation between precipitation and runoff per connection strength are categorised. Relations with a stronger correlation link between precipitation and runoff are singled out. The result of this paper is the separation of meteorological stations where precipitation measurements are acceptable for the purposes of predicting runoff at hydrological stations in the basin of the Bednja and Plitvica Rivers.