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.

Monitoring surveys and results

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Lessons learnt

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Catchment and subcatchment

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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

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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

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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

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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

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Structural measures
Bank/bed modifications	Building submerged weirs, Removal of old logs, Re-introducing of stones and spawning gravel, habitat restoration, Removal of revetments
Floodplain / River corridor	remeandering, reconnection of drained river sections, removal of embarkments
Planform / Channel pattern	Introducing 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

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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

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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

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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

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

Monitoring documents

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Image gallery

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Map of Iijoki catchment

Additional documents and videos

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Additional links and references

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Link	Description

Supplementary Information

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