Case study:Eldbäcken

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Location: 60° 26' 9.54" N, 14° 13' 47.69" E

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Project overview

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Status	Complete
Project web site	http://www.nrrv.se/
Themes	Habitat and biodiversity, Hydropower
Country	Sweden
Main contact forename	Stina
Main contact surname	Gustafsson
Main contact user ID
Contact organisation	Karlstad University
Contact organisation web site	http://www.nrrv.se
Partner organisations
Parent multi-site project
This is a parent project encompassing the following projects	No

Eldbäcken, biokanal (photo by Olle Calles)

Project summary

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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.

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Image gallery

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Floodplain habitat during high flow conditions. Photo: Olle Calles

Braided habitat during high flow conditions. Photo: Olle Calles

Colonization of riparian vegetation in progress. Photo: Olle Calles

Catchment and subcatchment Select a catchment/subcatchment Site Edit site Name Eldbäcken WFD water body codes WFD (national) typology WFD water body name River Västerdalälven Pre-project morphology Reference morphology Desired post project morphology Heavily modified water body Yes National/international site designation Local/regional site designations Protected species present No Invasive species present No Species of interest Freshwater pearl mussel (Margaritifera margaritifera), Brown trout (Salmo trutta) Dominant hydrology Dominant substrate boulder, cobble River corridor land use Average bankfull channel width category 2 - 5 m Average bankfull channel width (m) Average bankfull channel depth category 0.5 - 2 m Average bankfull channel depth (m) Mean discharge category 0.1 - 1.0 m³/s Mean annual discharge (m3/s) Average channel gradient category 0.001 - 0.01 Average channel gradient Average unit stream power (W/m2) Project background Edit project background Reach length directly affected (m) Project started Works started Works completed Project completed Total cost category Total cost (k€) Benefit to cost ratio Funding sources Fortum Environmental Fund Cost for project phases Phase cost category cost exact (k€) Lead organisation Contact forename Contact surname Investigation and design Stakeholder engagement and communication Works and works supervision Post-project management and maintenance Monitoring Reasons for river restoration Edit reasons for restoration Mitigation of a pressure Hydromorphology Biology Physico-chemical Other reasons for the project Measures Edit Measures Structural measures Bank/bed modifications Floodplain / River corridor Planform / Channel pattern Other Non-structural measures Management interventions Social measures (incl. engagement) Other Monitoring Hydromorphological quality elements Edit Hydromorphological quality elements Element When monitored Type of monitoring Control site used Result Before measures After measures Qualitative Quantitative Flow velocities No Yes Yes Yes Yes Substrate conditions No Yes Yes Yes Yes Biological quality elements Edit biological quality elements Element When monitored Type of monitoring Control site used Result Before measures After measures Qualitative Quantitative Fish No Yes Yes Yes Yes Invertebrates No Yes Yes Yes Yes Physico-chemical quality elements Edit Physico-chemical quality elements Element When monitored Type of monitoring Control site used Result Before measures After measures Qualitative Quantitative PH No Yes Yes Yes Yes Temperature No Yes Yes Yes Yes Any other monitoring, e.g. social, economic Edit Other responses Element When monitored Type of monitoring Control site used Result Before measures After measures Qualitative Quantitative Monitoring documents Upload monitoring documents Additional documents and videos Upload additional documents Additional links and references Edit links and references Link Description Supplementary Information Edit Supplementary Information