The thesis addresses the field of hydrological modeling, specifically the transformation of precipitation into surface runoff. As a part of this work, we first explained the theoretical principles underlying the formation of precipitation, its role within water cycle and the characteristics of surface runoff formation. Subsequently, the necessary input data required for the development of a hydrological model of the studied catchment is presented and interpreted. The ArcGIS Pro software was used as a tool for defining and analyzing geographical and hydrological data. Geological and pedological characteristics were determined, land-use proportions were obtained, and the topographic characteristics of the study area were defined. Based on the various methodologies for determining unit hydrograph (UH), parameters such as lag time, time of concentration, and the Curve Number (CN), which represent precipitation losses, were derived from the collected data. Empirical equations were then used to estimate precipitation losses and the synthetic unit hydrograph parameters used for transformation of precipitation into surface runoff. Hydrological modelling was carried out using the HEC-HMS software. Within the hydrological model, the most appropriate synthetic unit hydrograph method or transformation method for converting precipitation into surface runoff was determined based on precipitation data from the Vedrijan meteorological station and discharge data from the Neblo hydrological station. Ten selected rainfall events were analyzed to assess the relationship between precipitation and surface runoff, and the variation of the runoff coefficient was presented in relation to the total precipitation amount and the maximum recorded discharge.
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