Case study:Dam removal at Grönkullen, River Rolfsån

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Location: 57° 40' 21.34" N, 12° 35' 56.72" E

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Project overview

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Status	Complete
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/soran.aspx?keyword=gr%C3%B6nkullen
Partner organisations
Parent multi-site project	Case_study:Biologisk återställning i Rolfsåns vattensystem
This is a parent project encompassing the following projects	No

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Project summary

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Grönkullen hydro power station is located in one of the upstream tributaries of River Rolfså, River Sörån. Restorations took place after the county administrative board wanted to make migration possible for lake dwelling brown trout in lake Lygnern. Because there is a chemical plant and a railway situated next to the river and there is possible consentrations of the chemical in the river investigations were accomplished to find out weather the dam removal has any affection to the stability conditions. Conclusion was that there would not be any significant affection of the dam removal to the stability or water levels of the river. Investigations were made in 2004-2005 and the municipality of Bollebygds bought the plant to ba able to remove the dam. Restoration was done in 2005. Stones and gravel were added to the river bank along a 200 meter stretch and small part of the dam was saved. Total costs of the restorations were about 600 000 euros.

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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, 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	Grönkullen hydro power station
WFD water body codes
WFD (national) typology
WFD water body name	River Sörån
Pre-project morphology	Artificial bed, Artificial channel, Embanked, Over deepened, Over-widened
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	Lake dwelling brown trout
Dominant hydrology	Artificially regulated
Dominant substrate
River corridor land use	Woodland
Average bankfull channel width category
Average bankfull channel width (m)
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Average bankfull channel depth (m)
Mean discharge category
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Project background

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Reasons for river restoration

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Measures

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Monitoring

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