]> 2026-04-29T17:07:27+00:00 Case study:Ålgårda nature-like bypass channel at River Rolfsån 500 en Approved 10 - 50 m Building nature-like bypass channel Creation of fish passes Länsstyrelsen Västra Götalands län Fenno-Scandian Shield National Fund for compensation of hydropower production (Svenska naturskyddsföreningens Bra miljöval) and owner company of the power plant Triventus AB Regional Environment Authority (Länsstyrelsen Västra Götaland) Yes No Yes false Hydro power plant (photo. Outi Laamanen).JPG Old channel(photo. Outi Laamanen).JPG Nature-like bypass channel (photo. Outi Laamanen).JPG Bypass (photo. Outi Laamanen).JPG (photo. Outi Laamanen).JPG Ålgårda Hyro power plant (photo. Outi Laamanen) Old channel (photo. Outi Laamanen) New nature-like bypass channel (photo. Outi Laamanen) (photo. Outi Laamanen) Yes 57.488720349729,12.240723008057 Arolam Andreas Länsstyrelsen Västra Götalands län Bäckstrand 10 - 100 m³/s Building nature-like bypass channel, Creation of fish passes,,, ,,, 4332 Ålgårda bypass channel (photo Maria Arola) Bypass channel and Hydro power plant (photo. Maria Arola).JPG In progress The watercourse of River Rolfsån is one of the rare inland water areas in Sweden which has vivid salmon and sea trout populations. Besides Atlantic salmon (Salmo salar) and 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) and European eel (Anguilla anguilla) exist 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 bypass channel to Ålgårda hydropower plant was finished in October 2012. After the bypass channel has been built, 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. During winter 2012-2013 also a technical fishway will be finished and by summer 2013 some low sloping bar racks for downstream migration will be completed. In addition a fishery management plan is being prepared in 2013. Building of a bypass channel is the only option to enable migration for all fauna, also the benthic invertebrates. Bypass channels are also more recommendable than technical fishways because of their contribution to landscape. Ålgårda nature-like bypass channel at River Rolfsån ålgårda nature-like bypass channel at river rolfsån http://projektwebbar.lansstyrelsen.se/rolfsan/Sv/folj-atgardsarbetet/Pages/rolfsan.aspx Yes 100 Rolfsån River Basin Skagerrak and Kattegat River basin River Rolfsån river rolfsån Ålgårda bypass channel ålgårda bypass channel Atlantic salmon (Salmo salar) freshwater pearl mussel (Margaritifera margaritifera) European eel (Anguilla anguilla). Invasive species present: The signal crayfish (Pasifastacus leniusculus) Rolfsån River Fisheries Habitat and biodiversity Hydropower 5000 - 10000 k€ River Rolfsån 2012-11-12T15:00:09Z 2456244.1251042 2017-06-02T08:38:07Z 2457906.8598032 Ålgårda nature-like bypass channel at River Rolfsån 500 1 plainlist 5 [[Category:Case study]] [[Project title::!Ålgårda nature-like bypass channel at River Rolfsån]] [[Subcatchment title::Rolfsån River]] Ålgårda nature-like bypass channel at River Rolfsån# QUERY4addeef44052176149b22fdd4bac0618 500 [2,"smw_unitnotallowed",",6"] Ålgårda nature-like bypass channel at River Rolfsån# ERR9bbcd2c446f0c9000e4539dfb1eff7e7