Case study:Tolka Valley Park at Finglas

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Location: 53° 22' 40.44" N, 6° 18' 36.68" W

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Project overview

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Status	Complete
Project web site
Themes	Habitat and biodiversity, Social benefits
Country	Ireland
Main contact forename	Maryann
Main contact surname	Harrie
Main contact user ID
Contact organisation	Dublin City Council
Contact organisation web site	http://www.dublincity.ie
Partner organisations
This is a parent project encompassing the following projects	Tolka Valley Park at Finglas 2, Tolka Valley Park at Finglas 3, Tolka Valley Park erosion control

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Project summary

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The Tolka Valley Park was constructed in 1999-2000 to address misconnections and domestic effluents as a result of poor management in the area. The project aimed to attenuate pollutants and reduce malodours in order to enhance the amenity value of the site by creating of a new park with wetland and ponds for local biodiversity and people. A pilot study was completed with insigths to develop the project plan for the Tolka Valley Park.

Restoration measures included riparian planting to slow flows and prevent erosion, installation of geotextile to help the drainage of paths, construction of wetlands and sustainable urban drainage ponds, remedial planting to take up leachates and creation of new habitat. Landfill management issues addressed were on-going leachate introducing gravel filtration strips and vegetation buffers, as well as associated issues (i.e. methane, anaerobic conditions and methane issues). Creation of the wetlands was a 3 stage process. Actions aimed to attenuate and treat road runoff external to site and capture runoff within the site while controlling flooding. The new wetlands provide more habitat diversity for wildlife with visual interest for people.

Restoration overview: The re-colonisation by young, wild Atlantic salmon was spotted by Inland Fisheries Ireland in 3 locations in the Tolka. This is attributed mainly to the removal and modification of weirs as part of the “Tolka River's flood relief scheme” to allow migratory species, such as salmon, to migrate along the river corridor. As salmon can only survive in clean water, their presence also reflects efforts to reduce pollution levels in the river and effectiveness of the restoration measures aiming to improve water quality. Dublin now has 3 rivers producing wild salmon stocks (the Liffey, Dodder and Tolka), making it the only European capital city to hold such an accolade.

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Catchment and subcatchment

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Site

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Name
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WFD water body name
Pre-project morphology
Reference morphology
Desired post project morphology
Heavily modified water body	No
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Protected species present	Yes
Invasive species present	No
Species of interest	Otter (Lutra lutra), Atlantic salmon (Salmo salar), Trout, Bats (4 spp.), kingfisher (Alcedo atthis)
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Project background

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Phase	cost category	cost exact (k€)	Lead organisation	Contact forename	Contact surname
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Reasons for river restoration

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Mitigation of a pressure	pollution from landfill site
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Measures

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Structural measures
Bank/bed modifications
Floodplain / River corridor	Removal and modification of weirs
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Social measures (incl. engagement)	Increased number of facilities
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Monitoring

Hydromorphological quality elements

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quality elements

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

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Image gallery

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Additional links and references

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Link	Description
http://www.dublincity.ie/RecreationandCulture/DublinCityParks/VisitaPark/Pages/TolkaValleyPark.aspx	Dublin City Council local parks: the Tolka Valley Park

Supplementary Information

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