Case study:Biologisk återställning i Rolfsåns vattensystem

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Location: 57° 29' 20.85" N, 12° 7' 12.51" E

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Project overview

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Status	Complete
Project web site	http://projektwebbar.lansstyrelsen.se/rolfsan/Sv/Pages/default.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	County Administrative Board of Västra Götaland
Contact organisation web site	http://projektwebbar.lansstyrelsen.se/ROLFSAN/SV/Pages/default.aspx
Partner organisations
This is a parent project encompassing the following projects	Apelnäs fishway at River Rolfså, Bosgården nature-like fishway at River Rolfså, 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

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Project summary

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The River Rolfsån in South West Sweden had large populations of salmon, trout and european eel in the 1800s. After expansion of hydropower, cleansing of rivers and intensive fishing in the last hundred years there has been sharp decrease on the amount of migrating fish stocks. The river has been classified as extremely valuable by its natural characteristics. National Board of Fisheries classed the population particularly worth of protection. The Atlantic Salmon in Rolfså is unique, Fish are large and there has not been mixing between farmed salmon. The River was restored for sea migrating brown trout and eel, Atlantic salmon and river pearl mussel in co-operation with two administrative boards, four municipalities, the Swedish Agency for Marine and Water Management and land owners and fishing associations. The project started in 2006 and there has been two nature like bypass channels, one pool fishway and one downstream fishway built. Also one hydroelectric powerplant dam and two weirs has been removed and some streams has been restored as habitat for migrating fish.

All and allreproductive area for salmon and sea migrating broun trout has expanded from 35 000 square meters to 250 000 square meters.

The project was managed and mostly financed by the Länsstyrelse/Västra Götaland (regional environmental authority). The rest of the financing has been organized by the national environmental institute, Naturvårdsvärket, who is responsible for targeting the money collected from the hydro power companies to the watercourses which have been deteriorated by hydro power production.

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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, Bosgården nature-like fishway at River Rolfså, 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 Rolfsån River WFD water body codes SE640778- 130948 WFD (national) typology WFD water body name Rolfsån River Pre-project morphology There were several dams, which cut the migration of fish Reference morphology To take off old dams and build fisways next to existing power plants Desired post project morphology Heavily modified water body No National/international site designation EU - Special Area of Conservation Local/regional site designations Protected species present No Invasive species present No Species of interest Sea trout (Salmo trutta), European eel (Anguilla anguilla), minnow, Brown trout (Salmo trutta), Atlantic salmon (Salmo salar) Dominant hydrology Dominant substrate Gravel, Sand, Cobble River corridor land use Woodland Average bankfull channel width category 10 - 50 m 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) 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 2006/01/01 Works started Works completed 2012/01/01 Project completed Total cost category Total cost (k€) Benefit to cost ratio Funding sources County Administrative Board of Västra Götaland, Federal Nature Protection Agency, Energy company producing water electricity (Göteborg Energi) Cost for project phases Phase cost category cost exact (k€) Lead organisation Contact forename Contact surname Investigation and design County Administrative Board of Västra Götaland Anna Ek Stakeholder engagement and communication County Administrative Board of Västra Götaland Anna Ek Works and works supervision Post-project management and maintenance Monitoring Reasons for river restoration Edit reasons for restoration Mitigation of a pressure Hydropower Hydromorphology Continuity for organisms Biology Fish: Disturbance-sensitive species, Fish: Abundance, Fish: Species composition, Invertebrates: Disturbance-sensitive species Physico-chemical Other reasons for the project Recreation Measures Edit Measures Structural measures Bank/bed modifications Removal of old dams, Building fishways Floodplain / River corridor Planform / Channel pattern Removal of old dams, Building fishways 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 Continuity for organisms Biological quality elements Edit biological quality elements Element When monitored Type of monitoring Control site used Result Before measures After measures Qualitative Quantitative Fish: Disturbance-sensitive species Fish: Abundance Fish: Species composition Invertebrates: Disturbance-sensitive species 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