24.09.2025, Germany, Dortmund / Castrop-Rauxel, North Rhine-Westphalia - The Emscher-Auen farm, cafÈ and sewer pipe hotel in Castrop-Rauxel is located at the largest dam in the Emscher region, the Mengede flood retention basin. River renaturation, renaturation of the Emscher. A new floodplain landscape is being created at the Emscher-Auen farm, expanding the area for flood protection during heavy rainfall and for biodiversity. The previously straightened Emscher is regaining its curves and can meander through its new floodplain. The Emscher has been completely free of sewage since 2022, following the construction of a parallel sewage canal. The river was previously an open, above-ground mixed water channel carrying rainwater and sewage. 00X250924D005CAROEX.JPG [MODEL RELEASE: NO, PROPERTY RELEASE: NO (c) caro images / Oberhaeuser, http://www.caro-images.com, [email protected] - In case of using the picture for any purpose, please contact the agency - the picture is subject to royalty!]