Case study:Restoration of Naarkoski Torrent

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Location: 60° 38' 30.99" N, 25° 35' 17.96" 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	Kari
Main contact surname	Rantakokko
Main contact user ID
Contact organisation	SYKE
Contact organisation web site
Partner organisations
Parent multi-site project
This is a parent project encompassing the following projects	No

Naarkoski Torrent after restoration

Project summary

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Naarkoski torrent in the River Porvoonjoki is situated near the Pukkila city center. A fishway was constructed to enable the migrating fish to pass the Naarkoski power plant and open the way for fish to the upper reaches of the stream. Constructions of the bypass channel was started in October 2002 and finished in june 2003. Project was executed and managed in co-operation with the municipality of Pukkila and and Environmental Institute for Uusimaa. Cost of the restoration was 160 000 euros and it was financed by municipality of Pukkila, Environment Centre for Uusimaa and European Regional Development Fund, among the others.

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Restoration of Naarkoski Torrent_bypass construction

Catchment and subcatchment Select a catchment/subcatchment Edit the catchment and subcatchment details (affects all case studies in this subcatchment) Catchment River basin district Porvoonjoki River Basin River basin Subcatchment River name Naarkoski Torrent Area category Area (km2) Maximum altitude category Maximum altitude (m) Dominant geology Ecoregion Fenno-Scandian Shield Dominant land cover Intensive agriculture (arable) Waterbody ID Site Edit site Name Naarkoski Torrent-fishway WFD water body codes WFD (national) typology WFD water body name Pre-project morphology Ponded Reference morphology Step-pool Desired post project morphology Heavily modified water body National/international site designation Local/regional site designations Protected species present Invasive species present Species of interest Dominant hydrology Ephemeral 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 2003/01/01 Project completed Total cost category 100 - 500 k€ Total cost (k€) 160 k€160,000 € <br /> Benefit to cost ratio Funding sources SYKE, European Regional Development Fund (ERDF), Municipality of Pukkila, Regional ELY-centre, Uusimaa Regional Council 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 Fish Physico-chemical Other reasons for the project Measures Edit Measures Structural measures Bank/bed modifications Building fishway, Introducing gravel, Building of submerged weirs and pits, Introducing stones 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