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At present, surface runoff represents serious environmental problems in the urban environment, causing adverse effects on socio-economic and natural systems. Surface runoff is a complex source. The creation of surface runoff is described by various hydraulic hydrological processes, from the impact of water on the surface to the mouth into the sewer network or recipient. The formation of the precipitation-runoff process depends on several factors. Land-use change is a key factor that significantly affects the quality and quantity of surface runoff. In addition, the quality of surface runoff is also influenced by precipitation characteristics and air quality. In the last few years, the air quality is significantly worsened. The reason for this is the rapid development of urban areas, transport, and technical infrastructure. As a result of these phenomena, excessive gases, particularly carbon dioxide, methane, sulfur dioxide, and nitrous oxide, were produced. Due to many research, emission in the atmosphere accounts more than 50 % of atmospheric precipitation pollution. In recent decades, attention has been paid to rainwater quality due to the water crisis. The current use of large amounts of quality water and the removal of heavily polluted water causes significant damage to the aquatic ecosystem. Given the facts, the paper focuses on analyzing the quality of surface runoff captured in urban areas. Subsequently, a comparison of the influence of air quality on the quality of surface runoff is performed. The study results could help design the proper management of surface runoff in urban agglomerations concerning environmental protection and the possibility of rainwater reuse. [ABSTRACT FROM AUTHOR]

The development of urban areas, transport, and technical infrastructure is one of the natural phenomena that have been going on for several centuries. In recent years, due to migration population in many developed countries occurs a rapid increase of impervious areas in urban agglomerations. The rapid development of an impervious surface can cause changes in the hydrological and climatical characteristics of the area. As a result of these changes, surface runoff is creating. Surface runoff is an area source of pollution, occurring mainly during short, intense rains or flash floods. It is primarily formed in sloping or urban areas, where there is a lack of infiltration and retention objects to capture and temporarily retain rainwater. The occurrence of pollutants in surface runoff depends on land use and internal and external factors such as characteristics of air and soil pollutants, intensity and duration of precipitation, and other less important factors. The nature of pollutants in surface runoff in urban areas is diverse. Based on many studies, it can be said that the sources of contaminants in surface runoff coming from the air and paved areas like roads, roofs of buildings, facades, parking, and other impervious areas. The adverse effects of pollutants in the surface runoff negatively affect the environment. Therefore, the research study focuses on assessing the impact of contaminants in the air and on the surface of paved areas on the quality of surface runoff in urban areas. The study results could help design the proper management of surface runoff in urban agglomerations concerning environmental protection and the possibility of rainwater harvesting. [ABSTRACT FROM AUTHOR]

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]