Case study:Bosgården nature-like fishway at River Rolfså

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Location: 57° 36' 28.54" N, 12° 28' 9.16" E

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Project overview

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Status	Complete
Project web site	http://projektwebbar.lansstyrelsen.se/rolfsan/Sv/folj-atgardsarbetet/Pages/storan_bosgarden.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	Länsstyrelsen västra Götalands län
Contact organisation web site	http://projektwebbar.lansstyrelsen.se/rolfsan/Sv/folj-atgardsarbetet/Pages/storan bosgarden.aspx
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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Building and rebuilding of Bosgården hydroelectric plant during 1940-1960 decreased lake migrating brown trout populations, as 90 % of the spawning grounds were lost. In 1995 three pool-type fishways were constructed and minimum disharge was objected for natural riverbed which was often dry before. Still migrating fish population was suffered from the inconstant and low flows and complete dryness of riverbed for 100 metres at times.

the solution was to replace one pool-type fishway with a nature-like fish channel and tear down a weir in the main river near the outlet of the power plant. In addition, the minimum flow was increased from 300 to 600 L/s and an attraction flow was developed as the power plant shuts down in September and October annually for altogether 90 hours.Increasement of flow has returned spawning habitats to the river.

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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, 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	Bosgården hydropower plant
WFD water body codes
WFD (national) typology
WFD water body name
Pre-project morphology	Artificial bed, Artificial channel
Reference morphology	Step-pool
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	Sea migrating brown trout, The freshwater pearl mussel, European eel (Anguilla anguilla)
Dominant hydrology	Artificially regulated
Dominant substrate
River corridor land use	Intensive agriculture (arable)
Average bankfull channel width category
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)	66 m³/s <br />6,000 l/s <br />
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	2009/06/04
Project completed
Total cost category	100 - 500 k€
Total cost (k€)	290290 k€ <br />290,000 € <br />
Benefit to cost ratio
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Cost for project phases

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Investigation and design
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Works and works supervision
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Monitoring

Reasons for river restoration

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Mitigation of a pressure
Hydromorphology
Biology
Physico-chemical
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Measures

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Floodplain / River corridor
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Monitoring

Hydromorphological quality elements

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quality elements

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quality elements

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Supplementary Information

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