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
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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.

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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)

Catchment and subcatchment Select a catchment/subcatchment Edit the catchment and subcatchment details (affects all case studies in this subcatchment) 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) Waterbody ID Site Edit site Name Cathment of Vantaanjoki River WFD water body codes WFD (national) typology WFD water body name 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) 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 Average channel gradient Average unit stream power (W/m2) Project background Edit project background Reach length directly affected (m) Project started Works started Works completed Project completed Total cost category Total cost (k€) Benefit to cost ratio Funding sources Cost for project phases Phase cost category cost exact (k€) Lead organisation Contact forename Contact surname Investigation and design Stakeholder engagement and communication Works and works supervision Post-project management and maintenance Monitoring Reasons for river restoration Edit reasons for restoration Mitigation of a pressure Hydromorphology Biology Physico-chemical Other reasons for the project Measures Edit Measures Structural measures Bank/bed modifications Floodplain / River corridor Planform / Channel pattern Other Non-structural measures Management interventions Social measures (incl. engagement) Other Monitoring Hydromorphological quality elements Edit Hydromorphological quality elements Element When monitored Type of monitoring Control site used Result Before measures After measures Qualitative Quantitative [[]] Biological quality elements Edit biological quality elements Element When monitored Type of monitoring Control site used Result Before measures After measures Qualitative Quantitative [[]] Physico-chemical quality elements Edit Physico-chemical quality elements Element When monitored Type of monitoring Control site used Result Before measures After measures Qualitative Quantitative [[]] Any other monitoring, e.g. social, economic Edit Other responses Element When monitored Type of monitoring Control site used Result Before measures After measures Qualitative Quantitative Monitoring documents Upload monitoring documents Additional documents and videos Upload additional documents Additional links and references Edit links and references Link Description Supplementary Information Edit Supplementary Information