The current state of the technical infrastructure draining rainwater on the areas of the project is insufficient for the expected amount of rainwater and meltwater (in the catchment area covered by the project, there is no rainwater management system in place). The system of rainwater drainage on the remaining catchments of the Radziwie estate is in poor technical condition and has insufficient hydraulic parameters resulting in limited capacity. Currently, there is no comprehensive wastewater treatment system and rainwater retention system in the catchment area covered by the project, which to a large extent, without regulation, are introduced into receivers, and rainwater is not properly managed. In its current form, rainwater retention is lacking in order to delay their flow to the receiver. The scope of the construction works to be carried out includes: — construction of a reservoir ZR1, — construction of a rainwater sewer network with connections, — construction of a water supply network with connections, — construction of a sanitary sewage system with connections,