Case study:Ålgårda nature-like bypass channel at River Rolfsån

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Location: 57° 29' 19.39" N, 12° 14' 26.60" E

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Project overview

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Status	Complete
Project web site
Themes	Fisheries, Habitat and biodiversity, Hydropower
Country	Sweden
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Parent multi-site project	Case_study:Biologisk återställning i Rolfsåns vattensystem
This is a parent project encompassing the following projects	No

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The watercourse of River Rolfsån is one of the rare inland water areas in Sweden which has vivid salmon and sea trout populations. Besides sea trout (Salmo trutta trutta) there are also lake (Salmo trutta lacustris) and stream trout (Salmo trutta fario). Also endangered species freshwater pearl mussel (Margaritifera margaritifera) exists in the watercourse. To maintain these populations the fish need to be able to migrate upstream and downstream. This is why several bypass channels have been built in Rolfså River during last years.

The Ålgårda hydropower plant was built 1918. The application to inforce the power company to build fishway was delivered to Environmental Court in 2011.

The fish and benthic invertebrates are now able to migrate upstream from the Ålgårda power station. At the same time the hydropower production is ongoing. Building of a bypass channel is the only option to enable migration for all fauna, also the benthic invertebrates. Salmonids seem to use bypass channels instead of technical fishways for migration. Bypass channels are also more recommendable than technical fishways because of their contribution to landscape.

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