Datteln, North Rhine-Westphalia, Germany, Dattelner Muehlenbach is being built at the RRB Gutacker, the Steinrapener Bach (from right) and Westerbach (from top center) form the Dattelner Muehlenbach (left). The Dattelner Muehlenbach is now wastewater-free after the construction of a parallel sewer, belongs to the river system of the Lippe, was previously an open, above-ground wastewater canal, mixed water canal with surface water and wastewater. But the stream still flows in the old concrete bowls.