Case study:Restoration of Siuruanjoki River

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Location: 65° 24' 23", 25° 52' 30"
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Project overview

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Status Complete
Project web site
Themes Land use management - agriculture, Land use management - forestry, Social benefits, Water quality
Country Finland
Main contact forename Sanna
Main contact surname Pehkonen
Main contact user ID
Contact organisation Centre for Economic Development, Transport and the Environment for Lapland
Contact organisation web site
Partner organisations
Parent multi-site project
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Project summary

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Siuruanjoki River is located Northern part of Finland and is one of the tributaries of Iijoki River. The project ”Siuruanjoki kuntoon” (Making Siuruanjoki River Fit) objective was to apply various means of mitigate the diffuse loading impacts of a large watershed area within three municipalities in Northern Finland; i.e. within the Provinces of Lapland and Ostrobotnia. The project was carried out in Ostrobothnia in the years 2000-2006.

The project aim was to improve the quality of the water in Siuruanjoki River and the condition of the water system in such a way that it would be better suited to meet the needs of recreation, fishing, and tourism. The project was accomplished by mitigating the impacts of diffuse loading, restoring parts of the water system, and tending the river bank areas. The diffuse loading was mitigated by reducing the external loading from agriculture and forestry, and by improving the waste water treatment solutions used with regard to the rural population and holiday-home users. Lake Saunajarvi in the area of Pudasjarvi was restored by means of intensified fishing aimed at ridding the lake of undesirable and excessive fish species. In addition, the project included the central objective of adding to the environmental awareness and sense of responsibility of the local people.

Among the achievements of the project were the formulation of overall forestry-related plans for the protection of the water system, trials with new peat-production-related methods of treating run-off water, formulation of property-specific plans for improving the treatment of waste water, and nutrient balance studies were created for farms along with the conducting of environmental assessments. The project was mostly managed by Regional Environmental Agency of Ostrobothnia Pohjois-Pohjanmaan ymparistokeskus in close co-operation with local actors. The project had a total budget of € 630,705.

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Image gallery

Catchment of Siuruanjoki River
Bank reinforcement
Constructed sedimentation basin

Catchment and subcatchment


River basin district Iijoki River basin
River basin Siuruanjoki River Basin


River name Siuruanjoki River
Area category 1000 - 10000 km²
Area (km2) 2387 km²
238,700 ha
Maximum altitude category
Maximum altitude (m)
Dominant geology Organic (i.e. Peat)
Ecoregion Fenno-Scandian Shield
Dominant land cover bog
Waterbody ID


Name Catchment of Siuruanjoki River
WFD water body codes
WFD (national) typology
WFD water body name
Pre-project morphology
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 Coniferous plantation
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

Reach length directly affected (m)
Project started 2000/01/01
Works started
Works completed 2006/01/01
Project completed
Total cost category 500 - 1000 k€
Total cost (k€) 850 k€
850,000 €
Benefit to cost ratio
Funding sources European Regional Development Fund, Regional Environment Institute, Cities of Pudasjärvi, Yli-Ii and Ranua

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

Reasons for river restoration

Mitigation of a pressure Riparian development
Hydromorphology Continuity for organisms, Structure & condition of riparian/ lake shore zones
Biology Fish: Abundance, Fish: Species composition
Physico-chemical Nutrient concentrations
Other reasons for the project


Structural measures
Bank/bed modifications
Floodplain / River corridor Removal of embankments, Creation of wetland, establishment of woodland
Planform / Channel pattern
Non-structural measures
Management interventions
Social measures (incl. engagement) Awareness raising
Other Information provision, Participation in works, Participation in monitoring


Hydromorphological quality elements

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

Biological quality elements

Element When monitored Type of monitoring Control site used Result
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Physico-chemical quality elements

Element When monitored Type of monitoring Control site used Result
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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

Additional documents and videos

Additional links and references

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Supplementary Information

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