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 along the River Tolka 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 Select a catchment/subcatchment Site Edit site Name WFD water body codes WFD (national) typology WFD water body name Pre-project morphology Reference morphology Desired post project morphology Heavily modified water body No National/international site designation Local/regional site designations 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) Dominant hydrology Dominant substrate River corridor land use 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 Works started Works completed Project completed Total cost category Total cost (k€) Benefit to cost ratio Funding sources 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 pollution from landfill site Hydromorphology Biology Physico-chemical Other reasons for the project Measures Edit Measures Structural measures Bank/bed modifications Floodplain / River corridor Removal and modification of weirs Planform / Channel pattern Other Non-structural measures Management interventions Social measures (incl. engagement) Increased number of facilities 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.dublincity.ie/RecreationandCulture/DublinCityParks/VisitaPark/Pages/TolkaValleyPark.aspx Dublin City Council local parks: the Tolka Valley Park Supplementary Information Edit Supplementary Information