Free-flowing rivers

© Muhammet Azlak

Healthy free-flowing rivers allow free movement of water, sediment, fish and other organisms. However, for several decades, human interventions have disrupted river connectivity and degraded river ecosystem functioning. In Europe, very few free-flowing rivers remain.

Do you know?

In Europe, very few free-flowing rivers remain

Free-flowing rivers imply both longitudinal and lateral connectivity

25 000 km of free flowing rivers corresponds to restoring around 1.5 % of Europe’s river network

Today, the EU 2030 Biodiversity Strategy, which is part of the EU Green Deal, includes a target to restore 25000 km of free-flowing rivers, by removing obsolete barriers and the restoration of floodplains and wetlands.

Free-flowing rivers is still a new concept under European legislation, but it is expected to become an important driver for river and floodplain restoration. Free-flowing rivers have the potential to support multiple policy objectives through improved delivery of ecosystem services:

  • Improved achievement of biodiversity objectives, including improved conservation status of riparian habitats and species.
  • Improved achievement of ecological status of the Water Framework Directive
  • Improved carbon sequestration in floodplain soils
  • Improved use of natural water retention measures for disaster risk reduction

For a river to be free-flowing, neither transversal nor lateral barriers are to be in place. Transversal barriers, such as dams and weirs, disrupt the flow from upstream to downstream, and cut the longitudinal connectivity. In contrast, lateral barriers such as dikes, river bank stabilization, or drainage alter the natural movement of water and sediments, to and from the floodplain, and cut the lateral connectivity.

The relationship between river hydrology and morphology, also known as river hydromorphology is formally recognized as critical for the quality of aquatic environment. It is one of the supporting quality elements under the Water Framework Directive. The reporting under the Water Framework Directive has shown that for about one third of Europe’s surface water bodies it is a reason for not achieving good ecological status.

If you want to learn more

> Rivers and their floodplains

References

The main reference used in this page is:

  • The European Commission European Biodiversity Strategy for 2030 page
  • Other European Information Systems: