Case study:Restoration of Ingarskilanjoki River

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Location: 60° 4' 53.92" N, 24° 2' 58.34" 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	Harri
Main contact surname	Aulaskari
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

Restored Knutsinvirta (photo: Harri Aulaskari)

Project summary

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The Ingarskilanjoki River is 50 km long and runs into the Gulf of Finland. The Ingarskilanjoki River is the only river in Finland where the population of extremely endangered migrating sea trout (Salmo trutta) is natural, not from stocking. Due to flooding of the fields the river was straightened and dredged in 1988. The river was restored in 2002-2007 to recreate habitats for trout and its reproduction for the whole river length. The goal of the restoration was to increase the morphological diversity of the river by e.g. creating more variation of depths and meanders and adding gravel for fish spawning. The goal was also to enable the trout to migrate between the river and sea. In addition buffer strips were created to the catchment to decrease the nutrient loading from arable areas and to decrease turbidity of the river water. The local land owners and river side inhabitants were interviewed in order to take into account their opinions due to restoration. To ensure the recovery of the natural sea trout population, the trout fishing was prohibited in the river after the restoration. Before the dredging of the river, natural trout were caught and raised for further farming. After the dredging, the trouts that were caught from the natural population were stocked back into the river. However, because of the clearing and lost habitats, the reproduction of the trout had been weakened. The key success factor was that the decision of the preservation was made by the local fishing society. This is most likely the reason for that the fishing restriction has been obeyed which again has been crucial for balancing the reproduction and population of the sea trout. Since strict fishing restrictions, restorations and additional fish stockings, the local trout population has grown. These results shows that the restoration as a whole was succeeded.

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Image gallery

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Ingarskilanjoki River before restoration (photo: Harri Aulaskari)

Knutsinvirta after restoration (photo: Harri Aulaskari)

Catchment and subcatchment Select a catchment/subcatchment Edit the catchment and subcatchment details (affects all case studies in this subcatchment) Catchment River basin district River basin Ingarskilanjoki River Basin Subcatchment River name Ingarskilanjoki River Area category 100 - 1000 km² Area (km2) 160 km²16,000 ha <br /> Maximum altitude category Maximum altitude (m) Dominant geology Organic (i.e. Peat) Ecoregion Fenno-Scandian Shield Dominant land cover Waterbody ID Site Edit site Name Catchment of Ingarskilanjoki River WFD water body codes WFD (national) typology WFD water body name Pre-project morphology Straightened, Dredged Reference morphology Desired post project morphology Heavily modified water body National/international site designation Local/regional site designations multiple designations across the site Protected species present Invasive species present Species of interest Dominant hydrology Dominant substrate 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 2002/01/01 Works started Works completed 2007/01/01 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 Structure & condition of riparian/ lake shore zones, Width & depth variation Biology Invertebrates: Abundance, Fish: Disturbance-sensitive species Physico-chemical Nutrient concentrations Other reasons for the project Measures Edit Measures Structural measures Bank/bed modifications Depth variation, Re-introducing stones, Introduction of gravel, Creation of fish passes Floodplain / River corridor Buffer strips Planform / Channel pattern Other Non-structural measures Management interventions Social measures (incl. engagement) Other Participation in design, Information provision 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 Fish: Abundance Improvement 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