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The Emscher conversion also includes connecting sewers with smaller diameters. These include the Wittekindstraße project in Oberhausen with a DN1800 drive under the BAB42 motorway directly into the Emscher. The two construction sections of the Holzbach with around 3,000 metres of pipe strings driven in various dimensions and using different techniques (open shield with compressed air, AVN & EPB machines). Between Gelsenkirchen and Bochum, a reinforced concrete sewer just over 1,000 metres long was also constructed without trenches as part of the Wattenscheider Bach project.
