Case study:Restoration of Kostonjoki River

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Location: 65° 35' 20.76" N, 28° 13' 9.01" E

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Project overview

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Status	Complete
Project web site
Themes	Economic aspects, Fisheries, Habitat and biodiversity, Social benefits
Country	Finland
Main contact forename	Jukka
Main contact surname	Tuohino
Main contact user ID
Contact organisation	Centre for Economic Development, Transport and the Environment for North Ostrobothnia
Contact organisation web site	http://www.ymparisto.fi/default.asp?node=27306&lan=fi
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This is a parent project encompassing the following projects

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Kostonjoki River is one of the tributaries of the River Iijoki. The River Kostonjoki was dredged for timber floating like many other tributaries of the River Iijoki. Before dredging in 1956-1958 there were 105 hectares of rapids and riffles in the Kostonjoki River. After dredging most of the riffles and rapids were destroyed and habitats of the migrating fish lost. Restorations of the Kostonjoki River took place in 2005-2012 as the aim of setting the condition of the water system closer to it´s natural state to enable the fish migration. Object of the restorations was to create pool-riffle variation, add natural water levels to rewater dried parts of the river and add stones and gravel to create habitats for migrating fish. Restorations were successful. Rapid and riffle areas of the Kostonjoki River grew 60% after restorations and densities of migrating fish increased.

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Restoration of Kostonjoki River (photo: Eero Moilanen)

Restoration of Kostonjoki River_Restoration of Ala-Susikoski torrent (photo: Eero Moilanen)

Restoration of Kostonjoki River (photo: Eero Moilanen)

Restoration of Kostonjoki River_Restoration of Ala-Susikoski torrent (photo: Eero Moilanen)

Catchment and subcatchment Select a catchment/subcatchment Site Edit site Name The Kostonjoki River WFD water body codes WFD (national) typology WFD water body name Pre-project morphology Straightened, Over-widened Reference morphology Desired post project morphology Heavily modified water body No National/international site designation Local/regional site designations Protected species present Yes Invasive species present Yes Species of interest Trouts, European grayling, crabs, mussels Dominant hydrology Dominant substrate River corridor land use 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