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	Anna
Main contact surname	Ek
Main contact user ID
Contact organisation	County Administrative Board of Västra Götaland
Contact organisation web site
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 was restored for sea trout, rare lake trout, salmon and river pearl mussel. The river has been classified as extremely valuable by its natural characteristics which were deteriorated by two water power plants built in 1940's and 1950's. Because of the power plants the fish were completely unable to migrate between the sea and river. The watercourse continues upstream where there are five lakes and two other rivers with more hydro power plants. There have also been restorations in the other two rivers including dam removals, building fish passages, habitat restorations and rising the minimum flow of the rivers (by buying water). In 2009 a fish passage was built to the Myrekulla kvarn mill after which the migrants have been able to rise upstream.

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.

Monitoring surveys and results

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Lessons learnt

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Catchment and subcatchment

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(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

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Name
WFD water body codes
WFD (national) typology
WFD water body name
Pre-project morphology	There were several dams
Reference morphology	To take off old dams and build fisways next to relevant dams
Desired post project morphology
Heavily modified water body
National/international site designation	EU - Special Area of Conservation
Local/regional site designations
Protected species present
Invasive species present
Species of interest
Dominant hydrology
Dominant substrate	Gravel, Sand, Cobble
River corridor land use	Woodland
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	2006/01/01
Works started
Works completed	2012/01/01
Project completed
Total cost category	100 - 500 k€
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

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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

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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

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quality elements

Element	When monitored		Type of monitoring		Control site used	Result
	Before measures	After measures	Qualitative	Quantitative
Continuity for organisms

Biological quality elements

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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

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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

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Element	When monitored		Type of monitoring		Control site used	Result
	Before measures	After measures	Qualitative	Quantitative

Monitoring documents

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Image gallery

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Additional documents and videos

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Additional links and references

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Link	Description

Supplementary Information

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