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
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 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) exists 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.

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.

Monitoring surveys and results

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Lessons learnt

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Catchment and subcatchment

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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

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Name	Ålgårda hydroelectric power plant
WFD water body codes
WFD (national) typology
WFD water body name	The River Rolfsån
Pre-project morphology
Reference morphology
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
Dominant hydrology	Artificially regulated
Dominant substrate
River corridor land use
Average bankfull channel width category
Average bankfull channel width (m)
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Average bankfull channel depth (m)
Mean discharge category
Mean annual discharge (m3/s)
Average channel gradient category
Average channel gradient
Average unit stream power (W/m2)

Project background

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Project started
Works started
Works completed
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Benefit to cost ratio
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Cost for project phases

Phase	cost category	cost exact (k€)	Lead organisation	Contact forename	Contact surname
Investigation and design
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Post-project management and maintenance
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Supplementary funding information

The Ålgårda hydroelectric power plant was built in 1918. Only few salmons could reach Ålgårda because of a number of mills and fishing downstreams.Company was oblicated to built fishway only for eels but after authoroties application of the fishway also for other species in 2011 the court decided that the plant owner was required to build proposed fishway.

Reasons for river restoration

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Mitigation of a pressure
Hydromorphology
Biology
Physico-chemical
Other reasons for the project

Measures

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Structural measures
Bank/bed modifications	Building nature-like bypass channel, building technical fishway
Floodplain / River corridor
Planform / Channel pattern
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Non-structural measures
Management interventions
Social measures (incl. engagement)
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Monitoring

Hydromorphological quality elements

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quality elements

Element	When monitored		Type of monitoring		Control site used	Result
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Biological quality elements

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quality elements

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Any other monitoring, e.g. social, economic

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Monitoring documents

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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)

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Additional links and references

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Supplementary Information

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