Case study:Apelnäs fishway at River Rolfså

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Location: 57° 37' 53.75" N, 12° 29' 47.16" 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	User:Arolam
Contact organisation	Länsstyrelsen västra Götalands län
Contact organisation web site	http://projektwebbar.lansstyrelsen.se/rolfsan/Sv/folj-atgardsarbetet/Pages/Storan apelnas kraftverk.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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The Apelnäs powerplant was built in 1940. In 1995 a denil fishway was built and adapted for a minimum amount of water 300 L/s. A fish counter was placed at the upper end of the fishway. It was noticed that fish only migrated downstream, not upstream. The reason was that the fish could not find the fishway and there was still too little amount of water. A pool type fishway was decided to build because it was not possible to build a bypass channel because of steep steepness and rock-bedded bottom. After the finish of the pool-type fishway, the water flow was increased from 300 to 600 L/s for two months annually. In addition, the power plant will every September and October be turned off entirely for 10 hours on one day a week. This will provide an attraction flow for migrating trout during its spawning time.

To consider the eel, the top of the fishway walls were made slope and a little amount of water was entered to there. The idea was to have moss growing there, since it is excellent climbing material for eels. Also some 50 mm holes were made to the walll of the fishway to help the migrating eels to swim through them.

In 2009 construction of the new pool riffle fishway was ready and fish were able to migrate up and downstream (fiskväg + biotopvård).

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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: Biologisk återställning i Rolfsåns vattensystem, 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	Apelnäs hydropowerplant at river Storån
WFD water body codes
WFD (national) typology
WFD water body name	River Storån
Pre-project morphology	Artificial bed
Reference morphology	Pool fishway
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
Dominant hydrology	Artificially regulated
Dominant substrate	Bedrock
River corridor land use	Woodland, 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
Mean annual discharge (m3/s)
Average channel gradient category
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Average unit stream power (W/m2)

Project background

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Reach length directly affected (m)
Project started	2008
Works started
Works completed
Project completed
Total cost category	100 - 500 k€
Total cost (k€)	138138 k€ <br />138,000 € <br />
Benefit to cost ratio
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Cost for project phases

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Reasons for river restoration

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Measures

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Monitoring

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quality elements

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