Due to the construction of a new railway line, Banedanmark, the Danish Rail Development Authority, and Brøndby Municipality have worked closely together to implement anumber of rainwater management projects.
The basin along along the piped Rosenå plays a central role in the overall protection concept. Brøndby Municipality and HOFOR have registered frequent flooding of areas close to and on Brøndbyvester Boulevard. In the course of Banedanmark’s railway project, some old, and insufficient, rainwater basins had to be decommissioned and new ones had to be built. The partners agreed to establish a new separated sewer system ( a system where rainwater and waste water are collected and discharged separately) and an open , nature like basin for rainwater collection. The basin is located in “Den Grønne Kile – The Green Pathch”, a 700 by 700 meter wide green space framed by 4 highways, in the western suburbs of Greater Copenhagen.
The new basin transports, stores and infiltrates rainwater. During cloud burst, the water level in the basin can be increased temporarily. The excess water is later discharged into the sewer system.