Case study:Timber float restorations at River Iijoki

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Location: 65° 19' 28.71" N, 25° 25' 40.83" E

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Project overview

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Status	Complete
Project web site	http://www.ymparisto.fi/default.asp?node=5579&lan=fi
Themes	Fisheries, Habitat and biodiversity, Hydropower, Hydromorphology, Land use management - forestry
Country	Finland
Main contact forename	Timo
Main contact surname	Yrjänä
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=25563&lan=fi
Partner organisations	Metsähallitus (National Forestry Board)
This is a parent project encompassing the following projects	Restoration of Kostonjoki River

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Project summary

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River Iijoki has been restored mainly because of altered river morphology caused by intensive forestry and timber floating. Besides the main channel of River Iijoki, also all tributaries of this large river area have been restored. The main channel of the river is mainly harnessed for hydro power production and also two tributaries are regulated.

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Map of Iijoki catchment

Catchment and subcatchment Select a catchment/subcatchment Edit the catchment and subcatchment details (affects all case studies in this subcatchment) Catchment River basin district Iijoki River basin River basin Iijoki River Basin Subcatchment River name Iijoki River Area category more than 10000 km² Area (km2) 14191 km²1,419,100 ha <br /> Maximum altitude category 200 - 500 m Maximum altitude (m) 370 m0.37 km <br />37,000 cm <br /> Dominant geology Organic (i.e. Peat) Ecoregion Fenno-Scandian Shield Dominant land cover Woodland Waterbody ID Site Edit site Name Catchment of River Kostonjoki WFD water body codes WFD (national) typology WFD water body name Pre-project morphology Straight, High width:depth, embarked, monotonous Reference morphology Sinuous, single channel, Pool-riffle, Run-glide Desired post project morphology Heavily modified water body Yes National/international site designation Local/regional site designations Protected species present No Invasive species present No Species of interest Dominant hydrology partly regulated, partly natural hydrological regime Dominant substrate Cobble River corridor land use Woodland Average bankfull channel width category 10 - 50 m Average bankfull channel width (m) Average bankfull channel depth category 2 - 5 m Average bankfull channel depth (m) Mean discharge category 100 - 1000 m³/s Mean annual discharge (m3/s) 174174 m³/s <br />174,000 l/s <br /> Average channel gradient category more than 0.1 Average channel gradient Average unit stream power (W/m2) Project background Edit project background Reach length directly affected (m) Project started 1988/01/01 Works started Works completed 2011/12/31 Project completed 2013/12/31 Total cost category 10 - 50 k€ Total cost (k€) 1515 k€ <br />15,000 € <br /> Benefit to cost ratio Funding sources Ministry of Agriculture and Forestry Cost for project phases Phase cost category cost exact (k€) Lead organisation Contact forename Contact surname Investigation and design Centre for Economic Development, Transport and the Environment Timo Yrjänä Stakeholder engagement and communication Works and works supervision 1 - 10 k€ Centre for Economic Development, Transport and the Environment Timo Yrjänä Post-project management and maintenance 1 - 10 k€ Monitoring Metsähallitus, federal forestry center Reasons for river restoration Edit reasons for restoration Mitigation of a pressure Timber floating Hydromorphology Quantity & dynamics of flow, Width & depth variation, Flow velocities, Structure & condition of riparian zones Biology Fish: Abundance, Fish: Disturbance-sensitive species, Invertebrates: Disturbance-sensitive species Physico-chemical Other reasons for the project Flood risk management Measures Edit Measures Structural measures Bank/bed modifications Building submerged weirs, Removal of old logs, Re-introducing spawning gravel, Habitat restoration, Removal of revetments Floodplain / River corridor Remeandering, Reconnection of drained river sections, Removal of embankments Planform / Channel pattern Adding sinuosity Other Rehabilitation of water levels in nearby lakes Non-structural measures Management interventions fish stockings, monitoring, juridical processes 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 Quantity & dynamics of flow Yes Improvement Width & depth variation Yes Improvement Channel pattern/planform Yes Improvement Flow velocities Yes Improvement Structure & condition of riparian zones Yes Improvement 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 Yes Yes No No No Improvement Invertebrates Yes Yes No No No Inconclusive 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