The aim of the project is to build two underground reservoirs — one accumulation and one retention in Riegrovy sady. Water from the roofs of adjacent buildings (ground for gardeners) and paved roads will be brought into the reservoirs. The water from the accumulation tank will be pumped and piped to the facade of the building and used to water the urban greenery in Riegrovy sady. The main task of the retention tank is to retain excess rainwater in case of torrential rainfall and reduce its drainage to the drainage system.