Case study:Restoration of Ingarskilanjoki River

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Location: 60° 4' 53.92" N, 24° 2' 58.34" 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	Harri
Main contact surname	Aulaskari
Main contact user ID
Contact organisation	Centre for Economic Development, Transport and the Environment for Uusimaa
Contact organisation web site
Partner organisations
This is a parent project encompassing the following projects

Restoration of Kocksbybäcken brook (photo: Harri Aulaskari)

Project summary

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The Ingarskilanjoki River is 50 km long and runs into the Gulf of Finland. The Ingarskilanjoki River is the only river in Finland where the population of extremely endangered migrating sea trout (Salmo trutta) is natural, not from stocking. Due to flooding of the fields the river was straightened and dredged in 1988. The river was restored in 2002-2007 to recreate habitats for trout and its reproduction for the whole river length. The goal of the restoration was increasing the morphological diversity of the river by e.g. creating more variation of depths and meanders and adding gravel for fish spawning.The goal was also to take care of that the trout were able to migrate between river and sea. In addition buffer strips were created to the catchment to decrease the nutrient loading and turbidity of the river water. The local land owners and river side inhabitants were interviewed in order to take into account their opinions due to restoration. To ensure the recovery of the natural sea trout population, the trout fishing was prohibited in the river after the restoration. Before the dredging of the river, natural trout were caught and raised for further farming. After the dredging, caught trout from the natural population were stocked back to the river. However, because of the clearing and lost habitats, the reproduction of the trout had been weakened. The key success factor was that the decision of the preservation was made by the local fishing society. This is most likely the reason for that the fishing restriction has been obeyed which again is has been crucial for the balancing the sea trout reproduction and population. Since strict fishing restrictions and additional fish stockings the local trout population has grown which tells that the restoration as a whole was succeeded.

Monitoring surveys and results

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Catchment and subcatchment

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Catchment

River basin district
River basin	Ingarskilanjoki River Basin

Subcatchment

River name	Ingarskilanjoki River
Area category	100 - 1000 km²
Area (km2)	160 km²16,000 ha <br />
Maximum altitude category
Maximum altitude (m)
Dominant geology	Organic (i.e. Peat)
Ecoregion	Fenno-Scandian Shield
Dominant land cover
Waterbody ID

Site

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Name	Catchment of Ingarskilanjoki River
WFD water body codes
WFD (national) typology
WFD water body name
Pre-project morphology	Straightened, Dredged
Reference morphology
Desired post project morphology
Heavily modified water body
National/international site designation
Local/regional site designations	multiple designations across the site
Protected species present
Invasive species present
Species of interest
Dominant hydrology
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

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Reach length directly affected (m)
Project started	2002/01/01
Works started
Works completed	2007/01/01
Project completed
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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

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Mitigation of a pressure
Hydromorphology	Structure & condition of riparian/ lake shore zones, Width & depth variation
Biology	Invertebrates: Abundance, Fish: Disturbance-sensitive species
Physico-chemical	Nutrient concentrations
Other reasons for the project

Measures

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Structural measures
Bank/bed modifications	Building fishways, depth variation, Introducing gravel, Re-introducing stones
Floodplain / River corridor	creation of buffer strips
Planform / Channel pattern
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Non-structural measures
Management interventions
Social measures (incl. engagement)
Other	Participation in design, Information provision

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
[[]]

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						Improvement

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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Knutsinvirta ingarskilanjoki_after restauration (photo: Harri Aulaskari)

Before restauration (photo: Harri Aulaskari)

Additional documents and videos

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Additional links and references

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Supplementary Information

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