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Institut de recherche pour la conservation des zones humides méditerranéennes

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The Potential of Barrier Removal to Reconnect Europe’s Rivers

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Titre :	The Potential of Barrier Removal to Reconnect Europe’s Rivers
Auteurs :	Ulrich Schwarz, Auteur ; Floodplain Ecology and River Basin Management, Auteur
Type de document :	Rapport
Editeur :	Vienne, Autriche : Floodplain Ecology and River Basin Management, 2021
Format :	21
Langues:	Anglais
Mots-clés :	Europe ; cours d'eau ; Gestion eau ; Infrastructure humaine ; Corridor écologique
Résumé :	European rivers are the most fragmented in the world, leading to the loss of critical biodiversity, and driving fish and other freshwater species towards extinction. In 2020, the EU-funded AMBER project recorded over 600,000 barriers on rivers and streams across Europe and estimated that the total number of barriers may be more than 1 million. This suggests the necessity of further improvements to the river continuum to overcome the massive fragmentation of rivers. The removal of river barriers--namely ramps, weirs and dams--is a significant and effective measure to restore the river continuum for biota and sediment, as proposed by the EU Biodiversity Strategy for 2030. This study proposes an initial assessment of the number of river barriers in Europe which could be prioritised for removal and the expected outcome of such removal, based on a sample of 30,000 barriers (less than 3% of the total estimated number of barriers) in large and medium-sized rivers. The report focuses on the reconnection potential, i.e. the length and the ecological quality of reconnected rivers which could be achieved through barrier removal. Some of the barriers with particular uses, such as drinking water reservoirs or hydropower plant of a capacity > 10MW, are excluded where feasible. Out of over 30,000 assessed barriers along larger rivers across Europe 1, the study identifies 858 barriers with high reconnection potential in large and medium- sized rivers, which would allow to reconnect about 14,400 km of rivers. In the EU27, this figure would amount to 732 barriers with high reconnection potential, allowing to reconnect 11,500 km of rivers.
En ligne :	https://wwfeu.awsassets.panda.org/downloads/wwf_potential_of_barrier_removal_report.pdf

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