Case study:Timber float restorations at River Iijoki

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Location: 65° 19' 29", 25° 25' 41"
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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
Project picture

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.

Monitoring surveys and results

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Lessons learnt

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Map of Iijoki catchment


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Catchment and 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 km²
1,419,100 ha
Maximum altitude category 200 - 500 m
Maximum altitude (m) 370 m
0.37 km
37,000 cm
Dominant geology Organic (i.e. Peat)
Ecoregion Fenno-Scandian Shield
Dominant land cover Woodland
Waterbody ID



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) 174
174 m³/s
174,000 l/s
Average channel gradient category more than 0.1
Average channel gradient
Average unit stream power (W/m2)


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€) 15
15 k€
15,000 €
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

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

Structural measures
Bank/bed modifications Building submerged weir, 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 strategy, juridical processes
Social measures (incl. engagement)
Other


Monitoring

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

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

Element When monitored Type of monitoring Control site used Result
Before measures After measures Qualitative Quantitative


Any other monitoring, e.g. social, economic

Element When monitored Type of monitoring Control site used Result
Before measures After measures Qualitative Quantitative


Monitoring documents



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Additional links and references

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Supplementary Information

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