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, 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 digging the stream bed. The flood terrace has so far been large enough to prevent the brook to flood 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. There can also be expectet increase in trout habitats in the excavated section of upstreams, with the help of further restoration.

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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)

Catchment and subcatchment Select a catchment/subcatchment Edit the catchment and subcatchment details (affects all case studies in this subcatchment) 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 Edit site 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 No National/international site designation EU - Special Area of Conservation Local/regional site designations Protected species present No Invasive species present No Species of interest Brown trout (Salmo trutta) 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 Edit project background 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 Edit reasons for restoration 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 Edit Measures Structural measures Bank/bed modifications Adding sinuosity, Re-introducing stones, Introduction of gravel 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 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 Edit Supplementary Information