North City Watermain & Clontarf Flood Defence


Dublin City Council commissioned an Environmental Impact Statement (EIS) for the North City Arterial Watermain and Clontarf Flood Defence which form part of the larger North Fringe Water Supply Scheme. The subjects of the Environmental Impact Statement were the proposals to lay a new water pipeline from Fairview Park to Sutton, including spur mains on Hollybrook Road and Kilbarrack Road and to construct flood defences along Clontarf Promenade. The North City Arterial Watermain (NCAM) will involve the laying of approximately 9.7 km of watermains and is required to meet increased water demands, improve water pressures and provide security of supply to all north city areas including Howth, Sutton and Baldoyle. The Clontarf Flood Defence (CFD) is proposed to be constructed to protect coastal properties from inundation by the sea during flood conditions and will comprise of a grassed earth bund with an average height of 1.7 metres. A combination of walls, gates and dams will be used at areas along the promenade unsuitable for an earth bund.

While a mandatory Environmental Impact Assessment (EIA) for the development was not required under current national and European EIA legislation, Dublin City Council decided to prepare an EIS for the development as it considered that the development has the potential to have significant environmental effects due to its proximity to a three European Sites (the Special Protected Areas of the Tolka Estuary and the North Bull Island and the North Dublin Bay Special Area of Conservation) and due to the presence of contaminated material under Fairview Park and Clontarf Promenade. The aim of the EIS was to identify potential impacts of the development on the environment and to propose measures to mitigate any significant detrimental impacts.

Scope of Project

  • Project Management 
  • Scoping and Consultation with Planning Authorities, Government Agencies, Local Community Interests and Other Relevant Parties 
  • Impact Assessment on Environmental Aspects and Analysis 
  • Recommendation and Outlining Mitigation Measures
The main potential impacts of the proposed developments on environmental issues were examined under the following headings: Human Beings; Landscape and Visual; Noise and Vibration; Air Quality; Flora and Fauna; Water; Soil and Geology; Waste Management; Material Assets; Cultural Heritage

Some of the main impacts of the scheme include; disturbance to Brent geese and other wintering birds in the European Sites and on grasslands on the Clontarf Promenade and along the margins of the Alfie Byrne Road; landscape and visual impacts of the new earth bunds, walls and planting of the Clontarf Flood Defence; construction impacts on local residents, businesses and  leisure  users; reduction  in the  impact of  extreme  flood  events  on  the  existing  surface  water  drainag  systems; and the enhancement of the quality of the soil environment through the removal of contaminated material from the site.

 A range of mitigation measures have been proposed and full implementation of these measures will greatly reduce any significant adverse impacts of the scheme.