Case study:Biologisk återställning i Rolfsåns vattensystem

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Location: 57° 29' 21", 12° 7' 13"
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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 User:Arolam
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

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.

Monitoring surveys and results

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Lessons learnt

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Catchment and 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

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

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

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

Structural measures
Bank/bed modifications Dam removal, Creation of fish passes
Floodplain / River corridor
Planform / Channel pattern Dam removal, Creation of fish passes
Other
Non-structural measures
Management interventions
Social measures (incl. engagement)
Other


Monitoring

Hydromorphological quality elements

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

Biological 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

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

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


Monitoring documents



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Additional links and references

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Supplementary Information

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