Modern growing urban areas are faced with many problems, among which in the first instance may include the need for management of rainwater. The current system for management of rainwater is characterized by considerable inefficiency and ineffective and extremely functional system in the current extreme weather. In the case of an effective design of complex city hydrology, it is necessary to construct rainwater capture objects in the place where the rain falls directly. The consequence of such a process is the subsequent moistening zone and thus directly influencing a cooling urban area. The primary part of the research focuses on mathematical modelling of rainfallrunoff process in the urbanized area of Bratislava. In the framework of the proposal for an effective reduction of the surface runoff, measures will be proposed for the improvement of the hydrological microclimate in the real selected area. Designed objects are used directly for more efficient management of rainwater, and avoid inefficient overloading of sewers. [ABSTRACT FROM AUTHOR]