The stormwater system in Augustenborg – a Sustainable Urban Drainage System (SUDS) – consists of open canals, swales, ponds and green roofs as well as adapted levelling of green areas to ensure controlled flooding.
A model of the system was set up in MIKE FLOOD using MIKE URBAN (now MIKE+) and MIKE 21, including the rain on grid and infiltration modules in MIKE 21. This enabled correct estimation of stormwater infiltration in green areas. Two scenarios were created. One for the current (green, open) stormwater system and the other for the former (traditional, pipe-based) system. This methodology allowed us to evaluate the flood protection efficiency of the new open stormwater system compared to the old pipe-based system.
The simulations showed that the retrofitted green stormwater system had a substantially lower risk of flood damage compared to the former traditional system for the Augustenborg area during the rainstorm event in August 2014.