Case study:Restoration of Vakkolankoski Torrent

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Location: 60° 31' 0.17" N, 25° 34' 52.60" 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	Olli
Main contact surname	Jaakonaho
Main contact user ID
Contact organisation	Centre for Economic Development, Transport and the Environment for Uusimaa
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Parent multi-site project
This is a parent project encompassing the following projects	No

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Vakkolankoski torrent was restored as a part of the Porvoonjoki River restoration project for migrating fish. The power plant and the dam in the torrent has been obstacle for fish migration to the upstream reaches. The aim of the project was to enable fish migration by constucting the bypass channel to pass the dam. Slight meanders were excavated and stones and gravel were placed to increase the biodiversity of the brook and to create fish habitats. The restoration took place in 2008-2009 and the project was accomplished in co-operation between Centre for Economic Development, Transport and the Environment for Uusimaa and the municipality of Askola and NGO´s. Costs of the whole restoration was 232 000 euros.

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Construction of the fishway

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 Vakkolankoski 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 Vakkolankoski Torrent 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 2008/01/01 Works started Works completed 2009/01/01 Project completed Total cost category 100 - 500 k€ Total cost (k€) 232 k€232,000 € <br /> Benefit to cost ratio Funding sources Regional ELY-centre, Regional Environment Institute, Municipality of Askola 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 fishways, Building of submerged weirs and pits, Introduction of gravel 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