The master’s thesis addresses the topic of hydrological–hydraulic modelling using the rain-on-grid method within the HEC-RAS software environment. The traditional and current approaches to hydrological modelling are presented, followed by the description of the model setup using the rain-ongrid method and a discussion of the differences compared to the traditional approach, which employs separate hydrological and hydraulic models. The rain-on-grid modelling approach was analyzed for the Velunja River catchment, for which a reference hydrological study was conducted in 2015. For this catchment, a fully 2D hydraulic model was developed, and selected rainfall events were simulated. The results were compared with those of the reference study and with measurements from the gauging station. A sensitivity analysis of several key model parameters was also performed. In addition, the August 2023 rainfall event was simulated using terrestrial and radar-based precipitation data. In conclusion, the applicability of the method was evaluated, highlighting its advantages and limitations. Several guidelines for modelling using this approach were proposed.
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