The regional Boye receiving water has been ecologically enhanced thanks to the new waste water pipeline. The waste water feed, which previously ran into the Emscher tributary, will be underground in future. The joint venture is undertaking the jacking, the frame sections and the manhole structures made from reinforced concrete. Wittfeld is laying open design pipelines. A sewer with storage capacity and overflow (with lower-lying discharge) as a discharge facility and restoration work complete the range.