Case study:Tolka Valley Park erosion control

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Project overview

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Status	Complete
Project web site	http://riverwiki.restorerivers.eu/wiki/index.php?title=Case_study%3ATolka_Valley_Park_erosion_control
Themes	Habitat and biodiversity, Monitoring, 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
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Project summary

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The improvement of the Tolka Valley Park by Dublin City Council along the River Tolka created opportunity to pilot a new piloted approach under Renew4GPP, which is an EU LIFE Project (LIFE09 ENV/BE/000406).

The project aimed to enhance green space in an urban area by demonstrating to local authorities the ecological advantages to prevent erosion using high-quality and 100% biodegradable matting materials. This project also targeted existing fisheries to be improved with an increase of people engagement and the support from the Inland Fisheries Ireland and the Tolka Trout Anglers Association.

This piloted matting approach uses biodegradable weed control matting to be installed in areas of exposed soil. The site is being monitored by the Parks and Landscape Services Division to assess the effectiveness of the matting approach. First results indicate that it is preventing soil loss during flooding, resisting burning and reducing maintenance requirements.

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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 EU - Special Area of Conservation Local/regional site designations Protected species present Yes Invasive species present No Species of interest Otter (Lutra lutra), Atlantic salmon (Salmo salar), kingfisher (Alcedo atthis), Bats (4 spp.), Trout 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 Hydromorphology Biology Physico-chemical Other reasons for the project Measures Edit Measures Structural measures Bank/bed modifications New bioengineering elements in order to improve banks 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.dublincity.ie/RecreationandCulture/DublinCityParks/VisitaPark/Documents/Tolka%20valley%20Greenway.pdf Tolka Valley Greenway factsheet http://Dublin City Council Local Parks: Tolka Valley Park http://www.dublincity.ie/RecreationandCulture/DublinCityParks/VisitaPark/Pages/TolkaValleyPark.aspx Supplementary Information Edit Supplementary Information