The rapid increase in urbanization and current construction practices significantly reduce the infiltration of precipitation into the soil, which increases surface runoff. By implementing green infrastructure, we aim to infiltrate or retain a greater amount of precipitation within the considered area and thereby reduce surface runoff from the area. In this thesis, we analyzed the impact of green infrastructure on surface runoff in a small urban catchment in the city of Ljubljana. We considered measures involving an extensive green roof, an intensive green roof, and permeable concrete. For the study area, we determined the Curve Number (CN) coefficient based on land use, infiltrometer measurements, and field soil classification. Using the HEC-HMS hydrological model, we performed simulations for three rainfall events, comparing the baseline conditions of the area with four different scenarios involving the implementation of green infrastructure. For the simulations we used the SCS rainfall loss method. Based on an analysis of the simulation results, we concluded that green infrastructure positively contributes to reducing surface runoff in urban environments. The scenario featuring an intensive green roof and permeable concrete had the greatest impact on reducing surface runoff, reducing it from 9.4 to 46.4 percent for individual rainfall events. The detailed modeling procedure and results are presented in this thesis.
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