Having installed last April a rainwater tank dubbed Green+Blue Rooftop on the rooftop of the Seosomun annex building of Seoul City Hall, Seoul Metropolitan Government will install a similar system combined with green space on the rooftop of Cheongun Middle School, Jongno-gu on a trial basis.
The plan includes the formation of green space on the 285.5㎡-sized rooftop with a rainwater tank below the space. This is part of efforts to control repeated flooding in Gwanghwamun, which were warmly received by the school authorities.
According to Dr. Gwon Gyeong-ho at the Engineering Research Institute of Seoul National University, such system helps prevent the stored rainwater from flowing down the drainage immediately; this means avoiding flooding in a specific area during the rainy season.
The rainwater tank installed below the green space on the rooftop helps the stored rainwater flow down the drainage system slowly. It also offers other advantages such as heat insulation and landscaping. The green area can be used as a vegetable garden.
The Office of Waterworks Seoul Metropolitan Government will analyze the effect of said system. Seoul Metropolitan Government plans to expand such system to public buildings if the result of the analysis is positive.