Case study:Skårhultsdammen bypass channel at River Knipån

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Location: 57° 56' 40", 14° 4' 59"
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Project overview

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Status Complete
Project web site http://projektwebbar.lansstyrelsen.se/vattern/Sv/besoksmal-vatterbackar/knipan/Pages/Skarhultsdammen.aspx
Themes Fisheries, Habitat and biodiversity, Hydropower
Country Sweden
Main contact forename Ingemar
Main contact surname Bergbom
Main contact user ID User:Arolam
Contact organisation Länsstyrelsen i Jönköpings län
Contact organisation web site http://projektwebbar.lansstyrelsen.se/vattern/Sv/besoksmal-vatterbackar/knipan/Pages/Skarhultsdammen.aspx
Partner organisations
Parent multi-site project

Case_study:Restoration of river Knipån

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encompassing the following
projects
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Constructed new strem channel (photo. Maria Arola)

Project summary

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Skårhultsdammen pond was built in 1920th century and was used as water regulation for Kvarnekulla power plant. Local farmers were using water from Skårhultsdammen for irrigation which made water level downstreams unnatural low. There were also other negative effects of the pond for the river. One of the biggest problems for the ecology of the Knipån was the outlet of the pond which made the migration difficult for fish like trout and greyling. Also coarse fish which thrivdes in the pond had negative effects for migrating fish.

In 2009 and 2010 started the project as the aim of improving ecological and hydromorphological conditions of the River Knipån. The longest bypass channel in Sweden was constructed for making fish migration possible and making hydromorpological condtitions of the water closer to natural state. All and all 55 000 m2 sediment was taken away which increased the water volyme from 25 000 m2 to 80 000 m2. Total cost of the restoration was about 230 000 euros.

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Image gallery


Meandering of the new stream (photo. Maria Arola)
Constructed new stream (stones and gravel added) (photo. Maria Arola)
Confluence of old stream and new strem (photo. Maria Arola)
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Catchment and subcatchment

Catchment

River basin district Habo
River basin Knipån

Subcatchment

River name Knipån
Area category
Area (km2)
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Dominant geology
Ecoregion Fenno-Scandian Shield
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Other case studies in this subcatchment: Kvarnekulla nature like bypass channel at River Knipån


Site

Name Skårhultsdammen pond
WFD water body codes
WFD (national) typology
WFD water body name
Pre-project morphology
Reference morphology Bypass channel
Desired post project morphology
Heavily modified water body No
National/international site designation
Local/regional site designations
Protected species present No
Invasive species present No
Species of interest
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Project background

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Reasons for river restoration

Mitigation of a pressure
Hydromorphology
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Measures

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Floodplain / River corridor
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Monitoring

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Supplementary Information

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