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
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://projektwebbar.lansstyrelsen.se/rolfsan/Sv/folj-atgardsarbetet/Pages/rolfsan.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 the River Rolfsån is one of the rare inland water areas in Sweden where vivid natural salmon and sea trout populations exsist. The river is a habitat for at least three different trout species sea trout (Salmo trutta trutta), lake trout (Salmo trutta lacustris) and stream trout (Salmo trutta fario). Also endangered freshwater pearl mussel (Margaritifera margaritifera) exist in the watercourse.

The Ålgårda hydropower plant which was built in 1918 has been one of the obsticles for fish migration in the River Rolfså. The object of the restoration was to ensure that fish and other fauna is able to migrate pass the Ålgårda hydro power plant. The application to inforce the power company to build fishway was delivered to Environmental Court in 2011. Nature-like fishway was buit in 2012 and technical fishway is about to be constusted in winter 2012/2013. After the construction of the bypass channel fish and benthic invertebrates has been able to migrate pass the Ålgårda power station.

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)
Average bankfull channel depth category
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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Reach length directly affected (m)
Project started
Works started
Works completed
Project completed
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Total cost (k€)
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
Stakeholder engagement and communication
Works and works supervision
Post-project management and maintenance
Monitoring

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
Other
Non-structural measures
Management interventions
Social measures (incl. engagement)
Other

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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Physico-chemical 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)

Additional documents and videos

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Additional links and references

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Supplementary Information

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