Case study:Restoration of Kalajoki River

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Location: 64° 15' 22", 23° 56' 37"
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Project overview

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Status Complete
Project web site
Themes
Country Finland
Main contact forename Kimmo
Main contact surname Aronsuu (Kimmo.Aronsuu@ely-keskus.fi)
Main contact user ID
Contact organisation Centre for Economic Development, Transport and the Environment for North Ostrobothnia
Contact organisation web site http://www.ely-keskus.fi
Partner organisations
Parent multi-site project
This is a parent project
encompassing the following
projects
No
Restoration of Museokoski torrent (photo: Kimmo Aronsuu )

Project summary

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Since early 1900´s until early 2000´s there has been major river regulation measures done in the Kalajoki River. The river was dredged, straightened and embanked because of flood control, hydro power and log floating which significantly changed hydrological and morphological conditions in the river and affected the river as a habitat of aquatic organisms.

Since late 1970´s court ordered incorporated studies on effect on regulation measures on water quality, fish stocks and fishing into the rulings. Court also ordered compensational measures like fish stocking and rehabilitation measures which also included observation of the success of these measures. The river was restored to improve breeding conditions for lamprey and crayfish. Plan was to restore rapids total of 55 ha area in the lower reaches of Hamari. The aim was to create more natural conditions for migrating fish and other aquatiq organisms by building bypass channels, adding stones and gravel as and improving bank and bed of the river. The most significant restorations have been stocking of 4.7 million one summer old white fish in 1988-2010, restorations to improve reproduction conditions for creyfish and lamprey and stocking of 30 000 mature creyfish in 2003-2006. There has been also follow-up done to evaluate the effects of the restorations on crayfish, lamprey, fish stocks and the River Kalajoki as a habitat for aquatic organisms.

The government has been major actor in almost all of the water management projects in the River Kalajoki. Restorations were managed by Finnish environmental authority (Centre for Economic Development, Transport and the Environment for North Ostrobothnia). Restorations were done in co-operation with municipalities, local people and non governmental organizations. Estimated costs were about 1 million euros.

Monitoring surveys and results

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Image gallery


Catchment of River Kalajoki (Jouni Näpinkangas)
European River Lamprey (Lampetra fluviatilis) (photo. Juha Sarell)
Wintertime habitat (yellow spots) of European River Lamprey (photo. Jukka Tuohino)
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Catchment and subcatchment



Site

Name Kalajoki River Basin
WFD water body codes
WFD (national) typology
WFD water body name
Pre-project morphology
Reference morphology
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 crayfish, lamprey, different fish species
Dominant hydrology
Dominant substrate
River corridor land use Coniferous woodland (semi natural)
Average bankfull channel width category
Average bankfull channel width (m)
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Project background

Reach length directly affected (m)
Project started 1994
Works started
Works completed
Project completed 2004/09/02
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Cost for project phases

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Reasons for river restoration

Mitigation of a pressure Invasive species
Hydromorphology Channel pattern/planform, Continuity for organisms, Quantity & dynamics of flow
Biology Fish: Disturbance-sensitive species
Physico-chemical
Other reasons for the project


Measures

Structural measures
Bank/bed modifications
Floodplain / River corridor
Planform / Channel pattern
Other
Non-structural measures
Management interventions
Social measures (incl. engagement)
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Monitoring

Hydromorphological quality elements

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Monitoring documents



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Supplementary Information

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