Case study:Restoration of Longinoja brook

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Location: 60° 14' 54", 25° 1' 37"
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Project overview

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Status Complete
Project web site
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
Contact organisation web site
Partner organisations
This is a parent project
encompassing the following
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.

Monitoring surveys and results

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Lessons learnt

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Image gallery

Longinoja after restauration may 2006 (photo: Liisa Laitinen)
Longinoja restauration march 2006 (photo: Jukka Jormola)
Longinoja brook after restoration (photo: Lasse Jarvenpaa;
Stream restoration by voluntary work_Longinoja Brook_May 2012 (photo: Auri Sarvilinna;
After restauration (photo: Liisa Laitinen;
Before restauration (photo: Harri Aulaskari;
Spowning trout on a restored Longinoja gravel bad (photo: Juna Salomen,


Catchment and subcatchment


River basin district Southern Finland
River basin Vantaanjoki River


River name Longinoja brook
Area category 10 - 100 km²
Area (km2) 12 km²
1,200 ha
Maximum altitude category
Maximum altitude (m)
Dominant geology
Ecoregion Fenno-Scandian Shield
Dominant land cover Urban
Waterbody ID


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

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 €
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

Mitigation of a pressure
Hydromorphology Continuity for organisms, Continuity of sediment transport
Biology Fish: Species composition, Fish: Abundance, Fish: Disturbance-sensitive species, Invertebrates: Abundance
Other reasons for the project Landscape enhancement


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
Non-structural measures
Management interventions
Social measures (incl. engagement)
Other Information provision, Participation in works, Participation in monitoring


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

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

Element When monitored Type of monitoring Control site used Result
Before measures After measures Qualitative Quantitative

Any other monitoring, e.g. social, economic

Element When monitored Type of monitoring Control site used Result
Before measures After measures Qualitative Quantitative
Landscape enchansement Yes Awaiting results

Monitoring documents

Additional documents and videos

Additional links and references

Link Description ACRR Addressing practitioners, The Longinoja and Matapuro Brook Projects City of Helsinki.pdf Katja Pellikka, Urban brook reflects the catchment area.

Supplementary Information

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