Case study:Restorations of Ritobäcken brook

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Location: 60° 19' 4.53" N, 25° 12' 16.21" 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	Jukka
Main contact surname	Jormola
Main contact user ID
Contact organisation	SYKE
Contact organisation web site	http://www.environment.fi
Partner organisations
Parent multi-site project
This is a parent project encompassing the following projects	No

Rirobacken brook after restauration_summer 2011 (photo: Airi Kulmala)

Project summary

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Ritobäcken brook is a small tributary of River Sipoonjoki which is located near to Helsinki partly in a Sipoonkorpi National Park. Brook serves as a drainage channel for the surrounding agricultural fields which constitute 13% of the 10 km2 catchment area. The brook is also a reproduction area for the vulnerable sea run brown trout (Salmo trutta) of the Baltic Sea. Brook has been restored twice. First time was 2006 when 230 meters of dredged and straightened brook was restored as the aim of improving the habitat for the existing brown trout stock. The object was to support the natural development of the brook by adding sinousity and width and depth variation. Also stones and gravel were added and replaced to create habitats for the brown trout. In 2010 brook was restored as the aim of maintaining and enhancing the habitat diversity of the brook for migratory fish while decreasing flooding of the fields. Because of the significant bank and bed erosion in the upstream reaches and reduced conveyance in the downstream reaches fields were inundated during high flows. The two-stage cross-section was constructed on excavating a floodplain on one side of the channel and leaving the opposite side and bottom intact to prevent the digging of the stream bed. The flood terrace has so far been large enough to prevent flooding to the arable areas. Spawning brown trout have been monitored downstream in autumn 2010 and 2011, showing that no harm for fish was done by the excavation. The increase of trout habitat to the excavated section upstream can also be expected, with help of further restoration.

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	Southern Finland
River basin	Sipoonjoki River

Subcatchment

River name	Ritobäcken brook
Area category	10 - 100 km²
Area (km2)	12 km²1,200 ha <br />
Maximum altitude category
Maximum altitude (m)
Dominant geology	Organic (i.e. Peat)
Ecoregion	Fenno-Scandian Shield
Dominant land cover	Intensive agriculture
Waterbody ID

Other case studies in this subcatchment: Ritobäcken-environmentally preferable two-stage drainage channels

Site

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Name	Cathment of Ritobäcken Brook
WFD water body codes
WFD (national) typology
WFD water body name
Pre-project morphology	Sinuous, Straightened
Reference morphology	over-widened
Desired post project morphology
Heavily modified water body
National/international site designation	EU - Special Area of Conservation
Local/regional site designations
Protected species present
Invasive species present
Species of interest
Dominant hydrology	Ephemeral
Dominant substrate
River corridor land use	Intensive agriculture (arable)
Average bankfull channel width category
Average bankfull channel width (m)
Average bankfull channel depth category	0.5 - 2 m
Average bankfull channel depth (m)
Mean discharge category
Mean annual discharge (m3/s)
Average channel gradient category
Average channel gradient	0.002
Average unit stream power (W/m2)

Project background

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Reach length directly affected (m)
Project started	2009/01/01
Works started	2010/01/01
Works completed	2010/01/01
Project completed
Total cost category
Total cost (k€)
Benefit to cost ratio
Funding sources	Ministry of Agriculture and Forestry; Ministry of Environment; Regional ELY-centre; and EU

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	invasive species
Hydromorphology	Continuity for organisms, Width & depth variation, Structure & condition of riparian/ lake shore zones
Biology	Fish: Species composition, Fish: Abundance, Fish: Disturbance-sensitive species, Fish: Age structure
Physico-chemical
Other reasons for the project

Measures

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Structural measures
Bank/bed modifications	Adding sinuosity, Introducing gravel, Re-introducing stones
Floodplain / River corridor
Planform / Channel pattern
Other
Non-structural measures
Management interventions
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

Biological quality elements

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quality elements

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

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quality elements

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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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Building the floodplain by the Ritobäcken Brook in 2010 (photo: Kari Koppelmäki)

Ritobacken brook_the excavated flood terrace (photo: J.Jormola)

Ritobacken brook_autumn 2005 (photo: Auri Sarvilinna)

Ritobacken brook_spring 2006 (photo: Auri Sarvilinna)

Additional documents and videos

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Additional links and references

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Link	Description
http://www.balticdeal.eu/Paljok Farm/Baltic Deal.mht	Information about restauration of the Ritobacken brook
http://civil.aalto.fi/en/research/water/research/environmental hydraulics/sediment processes/	Physical sediment processes in environmental channels
http://www.restorerivers.eu/Portals/27/Ritob%C3%A4cken%20brook,%20Finland.pdf	Restoration of Ritobäcken brook

Supplementary Information

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