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	In progress
Project web site	http://projektwebbar.lansstyrelsen.se/rolfsan/Sv/folj-atgardsarbetet/Pages/rolfsan.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://www.lansstyrelsen.se/vastragotaland/En/Pages/default.aspx
Partner organisations
Parent multi-site project	Case_study:Biologisk återställning i Rolfsåns vattensystem
This is a parent project encompassing the following projects	No

Ålgårda bypass channel (photo Maria Arola)

Project summary

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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 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.

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Image gallery

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Ålgårda Hyro power plant (photo. Outi Laamanen)

Old channel (photo. Outi Laamanen)

New nature-like bypass channel (photo. Outi Laamanen)

(photo. Outi Laamanen)

(photo. Outi Laamanen)

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, 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 Site Edit site Name Ålgårda bypass channel WFD water body codes WFD (national) typology WFD water body name River Rolfsån Pre-project morphology Reference morphology Desired post project morphology Heavily modified water body No National/international site designation Local/regional site designations Protected species present Yes Invasive species present Yes Species of interest Atlantic salmon (Salmo salar), freshwater pearl mussel (Margaritifera margaritifera), European eel (Anguilla anguilla). Invasive species present: The signal crayfish (Pasifastacus leniusculus) Dominant hydrology Artificially regulated Dominant substrate River corridor land use 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 10 - 100 m³/s Mean annual discharge (m3/s) 11,6",6" is not declared as a valid unit of measurement for this property. Average channel gradient category Average channel gradient Average unit stream power (W/m2) Project background Edit project background Reach length directly affected (m) 100100 m <br />0.1 km <br />10,000 cm <br /> Project started Works started Works completed Project completed Total cost category 5000 - 10000 k€ Total cost (k€) Benefit to cost ratio Funding sources 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) 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 Quantity & dynamics of flow Biology Fish: Disturbance-sensitive species, Fish: Species composition, Invertebrates: Disturbance-sensitive species Physico-chemical Other reasons for the project Measures Edit Measures Structural measures Bank/bed modifications Building nature-like bypass channel, building technical fishway 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