Case study:Restoration of Vantaanjoki River

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Location: 60° 16' 6.76" N, 24° 57' 35.34" E

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Project overview

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Status	Complete
Project web site
Themes	Habitat and biodiversity
Country	Finland
Main contact forename	Kai
Main contact surname	Samanen
Main contact user ID
Contact organisation	Centre for Economic Development, Transport and the Environment for Uusimaa
Contact organisation web site
Partner organisations
This is a parent project encompassing the following projects

After restoration (photo: Olli Toivonen)

Project summary

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River Vantaanjoki flows to the Baltic Sea in Helsinki city. The river was famous for its salmon from medieval times but through dam construction and later through bad water quality the original stock became extinct. Through new sewage treatment systems the water was purified in the 1980's. Later multiple restorations have been done in River Vantaanjoki and its tributaries with the aim to enable fish migration from sea to upstream by removing dams, constructing fish passes and adding stone material and gravel to create habitats. Object of the restorations have also been to improve the condition of the water system in such a way that it would be better suited to meet the needs of recreation and fishing. After restorations salmon and sea trout, both highly threatened species in the Baltic Sea, begun to migrate and reproduce to the river. Restorations were accomplished in co-operation with environmental authorities, NGOs and volunteers. Co-operation between different organizations was a success and interests of different groups were well taken into account during projects.

Monitoring surveys and results

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Catchment and subcatchment

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Catchment

River basin district	Vantaanjoki River Basin
River basin

Subcatchment

River name	Vantaanjoki River
Area category	1000 - 10000 km²
Area (km2)	1271 km²127,100 ha <br />
Maximum altitude category
Maximum altitude (m)
Dominant geology	Organic (i.e. Peat)
Ecoregion	Fenno-Scandian Shield
Dominant land cover	Intensive agriculture (arable)
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Site

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Name	Cathment of Vantaanjoki River
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Pre-project morphology
Reference morphology
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
Dominant hydrology	Ephemeral
Dominant substrate	Estuarine mud
River corridor land use	Intensive agriculture (arable)
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Average bankfull channel width (m)
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Project background

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Reasons for river restoration

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Measures

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Monitoring

Hydromorphological quality elements

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Element	When monitored		Type of monitoring		Control site used	Result
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Biological quality elements

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quality elements

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Any other monitoring, e.g. social, economic

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Monitoring documents

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Image gallery

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Vantaanjoki River after restoration (photo: Olli Toivonen).

Vantaanjoki River Restoration by hand (photo: Olli Toivonen)

Vantaanjoki River_Gravel (photo: Olli Toivonen)

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Additional links and references

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Supplementary Information

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