The Landwehrbach and its tributaries are part of the Emscher sewage system. The Landwehrbach joint venture comprising the companies Eiffage Infra-Nordwest GmbH, Eiffage Infra-Vortriebstechnik GmbH (now Eiffage Infra-Spezialtiefbau GmbH) and Smet Tunnelling N.V. was commissioned by the Emschergenossenschaft with ecologically redeveloping the Landwehrbach. In future, surface water is to flow in near-natural rivers and waste water discharged in newly constructed parallel pipelines.

•    7 x start and finish pits to a depth of 16 m as intersected bored pile wall
•    2,150 m² of bored pile wall shoring for the structure of a sewer with storage capacity and overflow with lower-lying discharge, 4x stiffened, depth 17 m
•    370 m² of sheet pile shoring with shotcrete infill
•    520 m² of sheet pile shoring with wood infill
•    1 lowering shaft DN 3200, depth 12.0 m
•    515 m of pipe jacking DN 2200
•    370 m of pipe jacking DN 2400 using roadheader and compressed air-protected working face
•    530 m of pipe jacking DN 600 to DN 1200 by means of a full section machine and flushing conveyance
•    1,700 m³ of reinforced concrete work
•    1 operations building
•    Drainage measures
•     Open laying of various waste water pipes DN 800 to DN 2400