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

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Project summary

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Eldbäcken is a more diverse version of a nature-like bypass channel, a fishway type that we have called “biocanal”. The name derives from the idea that the fishway not only would facilitate passage, but also that it would create additional habitats and 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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Monitoring

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Element	When monitored		Type of monitoring		Control site used	Result
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Biological quality elements

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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

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PH	No	Yes	Yes	Yes	Yes

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