Fryd, Ole5; Backhaus, A.6; Birch, H.7; Farné Fratini, Chiara1; Ingvertsen, S. T.6; Jeppesen, J.7; Panduro, T. E.8; Roldin, M.9; Jensen, M. B.6
1 Center for Design, Innovation and Sustainable Transitions, The Technical Faculty of IT and Design, Aalborg University, VBN2 Center for Design, Innovation and Sustainable Transitions, The Technical Faculty of IT and Design, Aalborg University, VBN3 Department of Development and Planning, The Technical Faculty of IT and Design, Aalborg University, VBN4 The Faculty of Engineering and Science (TECH), Aalborg University, VBN5 Faculty of Architecture, Building and Planning, University of Melbourne, Parkville6 Department of Geosciences and Natural Resource Management, University of Copenhagen7 ALECTIA A/S8 Department of Food and Resource Economics, University of Copenhagen9 DHI Sweden
40% to the sewer, 60% to the city
Water Sensitive Urban Design (WSUD) is emerging in Denmark. This interdisciplinary desk study investigated the options for WSUD retrofitting in a 15 km2 combined sewer catchment area in Copenhagen. The study was developed in collaboration with the City of Copenhagen and its water utility, and involved researchers representing hydrogeology, sewer hydraulics, environmental chemistry/economics/engineering, landscape architecture and urban planning. The resulting catchment strategy suggests the implementation of five sub-strategies. First, disconnection is focused within sites that are relatively easy to disconnect, due to stormwater quality, soil conditions, stakeholder issues, and the provision of unbuilt sites. Second, stormwater runoff is infiltrated in areas with relatively deep groundwater levels at a ratio that doesn't create a critical rise in the groundwater table to the surface. Third, neighbourhoods located near low-lying streams and public parks are disconnected from the sewer system and the sloping terrain is utilised to convey runoff. Fourth, the promotion of coherent blue and green wedges in the city is linked with WSUD retrofits and urban climate-proofing. Fifth, WSUD is implemented with delayed and regulated overflows to the sewer system. The results are partially adopted by the City of Copenhagen and currently under pilot testing.
Water Science and Technology, 2013, Vol 67, Issue 9, p. 1945-1952