Ahr River Restoration, ADN421 Subproject, Insul Built-Up Area, Construction Phase 1

Summary

The tender concerns the restoration and development of the Ahr River in the Insul built-up area to increase retention space for floodwater and reduce flood and erosion risks up to an HQ100 flow. The works include, among other things, removing and placing floodplain soil, stabilising slopes with stone-filled river mattresses, adapting the bed sill near Hahnenstein Mill, shortening shaft structures, carrying out earthworks and vegetation works, and sowing. The earthworks must be performed with construction-phase unexploded ordnance detection. The tender submission deadline is 5 October 2026. The precise qualification, compliance and technical requirements must be checked in the official tender documents.