]> 2026-04-25T18:12:57+00:00 Case study:Bosgården nature-like fishway at River Rolfså 500 en Approved Länsstyrelsen västra Götalands län Fenno-Scandian Shield Yes No Yes true 300141.JPG 300157.JPG No 57.607927992367,12.469212026672 Arolam Andreas Länsstyrelsen västra Götalands län Bäckstrand 6 1 - 10 m³/s ,, ,,, 4333 Complete Building and rebuilding of Bosgården hydroelectric plant during 1940-1960 decreased lake migrating brown trout populations, as 90 % of the spawning grounds were lost. In 1995 three pool-type fishways were constructed and minimum disharge was objected for natural riverbed which was often dry before. Still migrating fish population was suffered from the inconstant and low flows and complete dryness of riverbed for 100 metres at times. the solution was to replace one pool-type fishway with a nature-like fish channel and tear down a weir in the main river near the outlet of the power plant. In addition, the minimum flow was increased from 300 to 600 L/s and an attraction flow was developed as the power plant shuts down in September and October annually for altogether 90 hours.Increasement of flow has returned spawning habitats to the river. Bosgården nature-like fishway at River Rolfså bosgården nature-like fishway at river rolfså http://projektwebbar.lansstyrelsen.se/rolfsan/Sv/folj-atgardsarbetet/Pages/storan_bosgarden.aspx No Rolfsån River Basin Skagerrak and Kattegat River basin River Rolfsån river rolfsån Bosgården hydropower plant bosgården hydropower plant Sea migrating brown trout The freshwater pearl mussel European eel (Anguilla anguilla) Rolfsån River Fisheries Habitat and biodiversity Hydropower 290 100 - 500 k€ 2009-06-04Z 2454986.5 2012-11-13T06:56:05Z 2456244.7889468 2013-09-06T07:15:22Z 2456541.802338 Bosgården nature-like fishway at River Rolfså 500 1 plainlist 5 [[Category:Case study]] [[Project title::!Bosgården nature-like fishway at River Rolfså]] [[Subcatchment title::Rolfsån River]] Bosgården nature-like fishway at River Rolfså# QUERYabb235f8fd96ba6731f2cde5d9fbc2df