Case study:Bosgården nature-like fishway at River Rolfså

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Location: 57° 36' 28.54" N, 12° 28' 9.16" E

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Project overview

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Status	Complete
Project web site	http://projektwebbar.lansstyrelsen.se/rolfsan/Sv/folj-atgardsarbetet/Pages/storan_bosgarden.aspx
Themes	Fisheries, Habitat and biodiversity, Hydropower
Country	Sweden
Main contact forename	Andreas
Main contact surname	Bäckstrand
Main contact user ID	User:Arolam
Contact organisation	Länsstyrelsen västra Götalands län
Contact organisation web site	http://projektwebbar.lansstyrelsen.se/rolfsan/Sv/folj-atgardsarbetet/Pages/storan bosgarden.aspx
Partner organisations
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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Project summary

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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.

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Catchment and subcatchment Select a catchment/subcatchment Edit the catchment and subcatchment details (affects all case studies in this subcatchment) Catchment River basin district Skagerrak and Kattegat River basin River basin Rolfsån River Basin Subcatchment River name River Rolfsån Area category Area (km2) Maximum altitude category Maximum altitude (m) Dominant geology Organic (i.e. Peat) Ecoregion Fenno-Scandian Shield Dominant land cover Woodland, Intensive agriculture (arable) Waterbody ID Other case studies in this subcatchment: Apelnäs fishway at River Rolfså, Biologisk återställning i Rolfsåns vattensystem, Dam removal at Grönkullen, River Rolfsån, Restorations of River Nolån-Hulta dam removal, ´Restorations of River Nolån-Bypass channel in Hulta Hydro power plant, ´Restorations of River Nolån-Fishway in Forsa hydro power plant, Ålgårda nature-like bypass channel at River Rolfsån Site Edit site Name Bosgården hydropower plant WFD water body codes WFD (national) typology WFD water body name Pre-project morphology Artificial bed, Artificial channel Reference morphology Step-pool 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 Sea migrating brown trout, The freshwater pearl mussel, European eel (Anguilla anguilla) Dominant hydrology Artificially regulated Dominant substrate River corridor land use Intensive agriculture (arable) Average bankfull channel width category Average bankfull channel width (m) Average bankfull channel depth category Average bankfull channel depth (m) Mean discharge category 1 - 10 m³/s Mean annual discharge (m3/s) 66 m³/s <br />6,000 l/s <br /> Average channel gradient category 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 2009/06/04 Project completed Total cost category 100 - 500 k€ Total cost (k€) 290290 k€ <br />290,000 € <br /> Benefit to cost ratio Funding sources 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 Biological quality elements Edit biological quality elements Element When monitored Type of monitoring Control site used Result Before measures After measures Qualitative Quantitative 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 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