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- 1 Project overview
- 2 Image gallery
- 3 Catchment and subcatchment
- 4 Site
- 5 Project background
- 6 Reasons for river restoration
- 7 Measures
- 8 Monitoring
- 9 Additional documents and videos
- 10 Additional links and references
- 11 Supplementary Information
|Project web site||http://www.nrrv.se/|
|Themes||Habitat and biodiversity, Hydropower|
|Main contact forename||Stina|
|Main contact surname||Gustafsson|
|Main contact user ID|
|Contact organisation||Karlstad University|
|Contact organisation web site||http://www.nrrv.se|
|Parent multi-site project|
| This is a parent project
encompassing the following
Eldbäcken is a more diverse version of a nature-like bypass channel, a fishway type that we call “biocanal”. The name derives from the fact that the fishway is constructed not only to facilitates passage, but also to contain additional habitats and thereby compensate for the loss of biodiversity which often is the result in regulated rivers. The biocanal was constructed in 2009 in the Västerdalälven river system, in the province of Dalarna in central Sweden, diverting water around the Eldforsen hydroelectric power plant and into the old river bed. The biocanal has a head of 5 m and a length of 500 m, resulting in a gradient of 1%. To make the flow as nature-like as possible, the intake of the biocanal is constructed to allow a variable flow regime.
To increase the potential for a high biodiversity, four different habitat types, each replicated three times, were created within the biocanal:
1) Pools, with a low water velocity and gravel substrate to compensate for lost freshwater pearl mussel (Margaritifera margaritifera) habitat and spawning areas for brown trout (Salmo trutta).
2) Floodplains, with winding channels and shallow ponds and
3) Braided habitats, where the canal has been diverted into narrow channels with islands in-between. These two habitat types were created to accommodate young individuals of brown trout.
4) Riffles, with a straight watercourse and higher water velocity, providing habitat for rheophilic taxa in general.
Monitoring surveys and results
Catchment and subcatchment
Cost for project phases
Reasons for river restoration
Hydromorphological quality elements
Biological quality elements
Physico-chemical quality elements
Additional documents and videos