Case study:Restoration of Kalajoki River

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Location: 64° 15' 21.76" N, 23° 56' 36.51" E

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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.

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Image gallery

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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)

Catchment and subcatchment Select a catchment/subcatchment Site Edit 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) 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 Edit project background Reach length directly affected (m) Project started 1994 Works started Works completed Project completed 2004/09/02 Total cost category Total cost (k€) Benefit to cost ratio Funding sources 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 Edit reasons for 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 Edit Measures Structural measures Bank/bed modifications Floodplain / River corridor Planform / Channel pattern Other Non-structural measures Management interventions Social measures (incl. engagement) Other Monitoring Hydromorphological quality elements Edit Hydromorphological quality elements Element When monitored Type of monitoring Control site used Result Before measures After measures Qualitative Quantitative Biological quality elements Edit biological quality elements Element When monitored Type of monitoring Control site used Result Before measures After measures Qualitative Quantitative Physico-chemical quality elements Edit 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 Edit Other responses Element When monitored Type of monitoring Control site used Result Before measures After measures Qualitative Quantitative Monitoring documents Upload monitoring documents Additional documents and videos Upload additional documents Additional links and references Edit links and references Link Description Supplementary Information Edit Supplementary Information