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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Rolfs\u00e5\n\u003C/p\u003E\u003Cp\u003E\u003Cb\u003ECountry:\u003C/b\u003E \u003Ca href=\"/wiki/index.php?title=Sweden\" title=\"Sweden\"\u003ESweden\u003C/a\u003E\n\u003C/p\u003E\u003Cp\u003E\u003Cb\u003EProject Status:\u003C/b\u003E Complete\n\u003C/p\u003E\u003Cp\u003E\u003Cb\u003EThemes:\u003C/b\u003E Hydropower\n\u003C/p\u003E\u003Cp\u003E\u003Cbr /\u003E\n\u003C/p\u003E","title":"Apeln\u00e4s fishway at River Rolfs\u00e5","link":"","lat":57.631596763657,"lon":12.496434248657,"icon":"/wiki/images/a/af/Red_marker.png"},{"text":"\u003Cp\u003E\u003Cbr /\u003E\n\u003C/p\u003E\u003Cp\u003E\u003Cb\u003EProject Title:\u003C/b\u003E Biologisk \u00e5terst\u00e4llning i Rolfs\u00e5ns vattensystem\n\u003C/p\u003E\u003Cp\u003E\u003Cb\u003ECountry:\u003C/b\u003E \u003Ca href=\"/wiki/index.php?title=Sweden\" title=\"Sweden\"\u003ESweden\u003C/a\u003E\n\u003C/p\u003E\u003Cp\u003E\u003Cb\u003EProject Status:\u003C/b\u003E Complete\n\u003C/p\u003E\u003Cp\u003E\u003Cb\u003EThemes:\u003C/b\u003E 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/\u003E\n\u003C/p\u003E\u003Cp\u003E\u003Cb\u003EProject Title:\u003C/b\u003E Dam removal at Gr\u00f6nkullen, River Rolfs\u00e5n\n\u003C/p\u003E\u003Cp\u003E\u003Cb\u003ECountry:\u003C/b\u003E \u003Ca href=\"/wiki/index.php?title=Sweden\" title=\"Sweden\"\u003ESweden\u003C/a\u003E\n\u003C/p\u003E\u003Cp\u003E\u003Cb\u003EProject Status:\u003C/b\u003E Complete\n\u003C/p\u003E\u003Cp\u003E\u003Cb\u003EThemes:\u003C/b\u003E Hydropower\n\u003C/p\u003E\u003Cp\u003E\u003Cbr /\u003E\n\u003C/p\u003E","title":"Dam removal at Gr\u00f6nkullen, River Rolfs\u00e5n","link":"","lat":57.672594335363,"lon":12.599088048935,"icon":"/wiki/images/a/af/Red_marker.png"},{"text":"\u003Cp\u003E\u003Cbr /\u003E\n\u003C/p\u003E\u003Cp\u003E\u003Cb\u003EProject Title:\u003C/b\u003E Restorations of River Nol\u00e5n-Hulta dam removal\n\u003C/p\u003E\u003Cp\u003E\u003Cb\u003ECountry:\u003C/b\u003E \u003Ca href=\"/wiki/index.php?title=Sweden\" 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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
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

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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	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

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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
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
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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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