WP4 Deliverables

Task 4.4 Feasibility study on river engineering measure in the Elbe

River engineering solutions that create additional flood space area known to affect sediment transport patterns and the development of specific habitats in estuaries such as shallow water areas. As part of a stakeholder consultation process 23 potential locations were identified for various engineering measures that could positively influence the characteristics of the Elbe estuary. They were discussed among the members of the estuary partnership “Forum Tideelbe”, and the 3 most suitable measures have been identified for further recommendation to the responsible authorities. The reconnection of the Dove Elbe, an anabranch located in the east of the city of Hamburg that has been separated from the estuary, was one of the most suitable locations to address tidal pumping but also to provide benefits for nature and society. IMMERSE partners HPA and BAW decided to support the estuary partnership by:

a) developing a measure layout to reconnect the Dove Elbe with the participation of stakeholders,

b) assessing the hydromorphological effects of the developed measure layout through numerical modelling, and

c) tendering a feasibility study that should investigate the ecological effects of the measure as well as the possible support of the measure by the locals by conducting stakeholder interviews.

Results of the investigation can be found in the (German) report: the study delivered important insights of the measure´s effects and led to concrete results, different than preliminary investigations in the estuary where only potential benefits were evaluated without considering social components. The whole process let to important insights on the relevance of stakeholder participation and adequate communication to achieve acceptance. Now, potential implementation is in the power of administrative decision-makers in the Elbe estuary.

Executive summary and lessons learned from a feasibility study: Effects of the reconnection of the Dove Elbe to the tidal Elbe and local stakeholders (English)

Report: Feasibility study on river engineering measure in the Elbe (in German)

BAW Report: Impact of the creation of flood space in the area of the Tidal Elbe, Reconnection Dove Elbe: Results of the hydraulic engineering system study on the Dove Elbe measure (in German)