Case study:Restoration of Longinoja brook

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Location: 60° 14' 54.16" N, 25° 1' 36.90" E

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Project overview

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Status	Complete
Project web site	http://www.ymparisto.fi/default.asp?node=27550&lan=fi
Themes	Fisheries, Habitat and biodiversity, Hydromorphology, Social benefits
Country	Finland
Main contact forename	Harri
Main contact surname	Aulaskari
Main contact user ID
Contact organisation	Centre for Economic Development, Transport and the Environment for Uusimaa, Finnish Environment Institute
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This is a parent project encompassing the following projects

Longinoja after restauration_may 2006 (photo: Liisa Laitinen)

Project summary

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Longinoja brook has been restored several times during years 2006-2011. The straightened brook flows through densely populated area and partly along cultivated area. The brook is situated in the city of Helsinki. Longinoja brook is an important breeding area for the sea trout of the Vantaanjoki River. The aims of restorations was to create and increase the breeding possibilities for migrating fish and also to improve the area’s landscape. Restoration was part of the project where modern environmental hydraulic engineering methods were studied in the areas with fine-grained soils. The planning aimed to enhance natural conditions and at the same time maintain sufficient drainage level. The restoration project has been a good example of a succeeded co-operation between different organizations and stakeholders. The project was managed by the Finnish Environmental authorities (Finnish Environment Institute and The Centre for Economic Development, Transport and the Environment) and the city of Helsinki. The restoration work was mostly accomplished by volunteers in co-operation with the authorities.

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Image gallery

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Longinoja after restauration may 2006 (photo: Liisa Laitinen)

Longinoja restauration march 2006 (photo: Jukka Jormola)

Longinoja brook after restoration (photo: Lasse Jarvenpaa; www.itamerihaaste.net)

Stream restoration by voluntary work_Longinoja Brook_May 2012 (photo: Auri Sarvilinna; www.environment.fi)

After restauration (photo: Liisa Laitinen; www.itamerihaaste.net)

Before restauration (photo: Harri Aulaskari; www.itamerihaaste.net)

Spowning trout on a restored Longinoja gravel bad (photo: Juna Salomen, www.ecrr.org.)

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 Vantaanjoki River Subcatchment River name Longinoja brook Area category 10 - 100 km² Area (km2) 12 km²1,200 ha <br /> Maximum altitude category Maximum altitude (m) Dominant geology Ecoregion Fenno-Scandian Shield Dominant land cover Urban Waterbody ID Site Edit site Name Cathment of Longinoja brook WFD water body codes WFD (national) typology WFD water body name Pre-project morphology Straight Reference morphology Sinuous Desired post project morphology Heavily modified water body true National/international site designation Local/regional site designations multiple designations across the site Protected species present Invasive species present Species of interest Dominant hydrology Ephemeral Dominant substrate River corridor land use Urban 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 2006/01/01 Works started Works completed 2011/01/01 Project completed Total cost category 10 - 50 k€ Total cost (k€) 10000 k€10,000,000 € <br /> Benefit to cost ratio Funding sources Finnish Environment Institute 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 Finnish Environment Institute Reasons for river restoration Edit reasons for restoration Mitigation of a pressure Hydromorphology Continuity for organisms, Continuity of sediment transport Biology Fish: Species composition, Fish: Abundance, Fish: Disturbance-sensitive species, Invertebrates: Abundance Physico-chemical Other reasons for the project Landscape enhancement Measures Edit Measures Structural measures Bank/bed modifications Building of submerged weirs and pits, Adding sinuosity, Introduction of gravel, Creation of fish passes Floodplain / River corridor Planform / Channel pattern Introducing large woody debris, Adding sinuosity Other Non-structural measures Management interventions Social measures (incl. engagement) Other Information provision, Participation in works, Participation in monitoring Monitoring Hydromorphological quality elements Edit Hydromorphological quality elements Element When monitored Type of monitoring Control site used Result Before measures After measures Qualitative Quantitative Continuity for organisms Awaiting results Continuity of sediment transport Awaiting results Biological quality elements Edit biological quality elements Element When monitored Type of monitoring Control site used Result Before measures After measures Qualitative Quantitative Fish: Abundance Awaiting results Fish: Disturbance-sensitive species Awaiting results Fish: Age structure Awaiting results Invertebrates: Abundance Awaiting results 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 Landscape enchansement Yes Awaiting results Monitoring documents Upload monitoring documents Additional documents and videos Upload additional documents Additional links and references Edit links and references Link Description http://www.ecrr.org/publication/ecrrbrochure.pdf ACRR Addressing practitioners, The Longinoja and Matapuro Brook Projects http://www.itamerihaaste.net/files/327/Pellikka City of Helsinki.pdf Katja Pellikka, Urban brook reflects the catchment area. Supplementary Information Edit Supplementary Information