Case study:Skårhultsdammen bypass channel at River Knipån

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Location: 57° 56' 39.88" N, 14° 4' 58.60" E

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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	-
Main contact surname	-
Main contact user ID
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
This is a parent project encompassing the following projects	No

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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Catchment and subcatchment

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Catchment

River basin district	Habo
River basin	Knipån

Subcatchment

River name	Knipån
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Ecoregion	Fenno-Scandian Shield
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Other case studies in this subcatchment: Kvarnekulla nature like bypass channel at River Knipån

Site

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Name	Skårhultsdammen pond
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Pre-project morphology
Reference morphology	Bypass channel
Desired post project morphology
Heavily modified water body	No
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Protected species present	No
Invasive species present	No
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Project background

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Reasons for river restoration

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Mitigation of a pressure
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Measures

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Monitoring

Hydromorphological quality elements

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quality elements

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Image gallery

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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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Supplementary Information

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