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Sewerage networks form an integral part of urban infrastructure. It is necessary to reconsider the outdated concept of sewer networks and rainwater management in cities that do not meet sustainable development ideas. The new understanding of rainwater management needs to be adapted to the new environmental conditions caused by climate change. The occurrence of pluvial floods has recently become an increasingly common phenomenon. The reasons are outdated sewer networks, rapid urbanization, an increase in impervious areas, and changes in the characteristics of rainfall events caused by climate change. The aim of the paper is to examine the conditions of pluvial floods in urban areas. With the help of literature research, the leading causes and primary conditions of urban floods were summarized. More than 40 scientific publications in this area were studied during the research. The results of the investigated studies demonstrate the need to change the design concept of urban sewer networks. The usual method of wastewater management in cities was based on the concept of the fastest drainage of water from an urbanized area. This concept ensures the prevention of endangering human lives and property, limiting traffic and the negative impact of these waters on surface and groundwater quality. At present, high demands are placed on the protection of the urban environment. Many sewer networks were designed in the last century based on the conditions of the time. Due to the new conditions resulting from climate change, it is necessary to re-evaluate the functionality and capacity of individual networks. [ABSTRACT FROM AUTHOR]

The purpose of mathematical modeling of runoff flow in sewer networks is to assess the hydraulic capacity and monitor their behavior in different conditions to predict the future state. Models of sewer networks are part of the design process. Their advantage is the possibility of simulating the future state of the network and the precipitation and runoff process in the context of climate change. With the help of simulations, it is possible to anticipate future conditions in the river basin and thus effectively design new networks. The presented paper focuses on using the MIKE URBAN model to assess of the sewer network of the city of Trnava, which lies in western Slovakia. The city's sewer network is obsolete and requires the reconstruction of certain sections. Problem sections of the network were identified using modeling. Reduced block rain with a return period of once in 2 years was used to simulate the storm event. The dry weather flow was simulated as a cyclic boundary condition corresponding to the water consumption unevenness curve. [ABSTRACT FROM AUTHOR]