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Stormwater presents a significant problem in urban areas, especially in large cities. The intensified formation of impermeable surface leads to suppressing permeable-vegetation areas and, subsequently, substantial changes in the area's hydrological, environmental, and ecological characteristics. By changing the city's spatial structure, there may be an increase in flood peak, volume of runoff, and rising pollution in urban stormwater. As a result of this phenomenon, the aquatic environment can be degraded by changing water bodies' like rivers, lakes, etc. chemical and physical characteristics. Therefore, today more attention to storm water's qualitative parameters from paved surfaces as car parking, roadways, etc. This article focuses on capturing the first flush of stormwater runoff from impervious areas (roadway) during the rainfall events. The selected area of interest was near the Faculty of Civil Engineering campus in Bratislava, STU (Slovak Republic) - roadway Imricha Karvaša. In the chemical analysis were monitored qualitative parameters as reaction pH and organically bound halogens - AOX. The study aims are to compare the qualitative parameters of individual samples and evaluate them with recommendations of the Government of the Slovak Republic No. 269/2010. According to the results, the average value pH was 7.07, and the average concentration of AOX 767.77 μg.l-1. The concentration of AOX extends the limit value, and therefore in the future, it is necessary to propose some measures (infiltration, retention tanks, etc.) to prevent unsuitable rainwater management. [ABSTRACT FROM AUTHOR]

By building artificial landscape elements, significant changes occur in the spatial structure of the city. The intensification of the formation of paved surface changes the hydrological characteristics of the area. Impermeable surface prevents the penetration of atmospheric waters into the soil horizon, which causes an increase in the volume of runoff, flood peak, and pollution loads in urban stormwater. As a consequence of this phenomenon, during heavy rains, a critical part of the city may be flooded. To reduce the flood in the city, caused by surface runoff, the determination of the critical parts of urban sub-catchment plays an important role in urban planning plans. Due to the lack of information about possible urban flooding scenarios in the given study, we focus on simulating urban surface runoff using the SWMM model. The research goal is to assess the current state of the sewer network during the rainy season. For the present study, we selected the the part of urban catchment of Bardejov city (Slovak Republic). To simulate a rainy event was used as design rain a block rainfall. [ABSTRACT FROM AUTHOR]