As part of A.5.8. Smart urban drainage system, infrastructure documentation for the smart urban drainage system in Poreč-Parenzo was implemented for the purpose of negative effects of rainwater in the city parking lot in Poreč. An integral approach to the design of the drainage system makes it possible to eliminate the negative consequences of torrential water while respecting, preserving and rehabilitating the value of the existing landscape. Designed infrastructural elements make it possible to let rainwater into the soil of the locality where the rain falls in its natural cycle in such a way that the water is retained in the basin and the coefficient of its runoff is reduced.