Dublin Bay Project – North Dublin Drainage Works

RPS supported Dublin City Council & Fingal Co. Council on the Dublin Bay Project, the largest of its type in Ireland. This project involved a suite of contracts to eliminate foul flows from the North Dublin catchment to the sea at Howth.

 

RPS formed the lead consultant on this project with a review of the existing catchment in the early 1990’s, culminating in the commissioning in 2011 of the final element of the works; the reversal of foul flows from Howth to a new pumping station at Sutton using a variety of open cut and tunnelled techniques.

From there, all flows are pumped forward to Ringsend Waste Water Treatment works, via a 1400mm diameter sub-sea pipeline constructed as part of the works. At 11km long, this pipeline is the largest one of its type in Europe.

Key details

Project name

Dublin Bay Project – North Dublin Drainage Works

Client 

Dublin City Council / Fingal Co. Council

Location 

Dublin, Ireland

Services provided

  • Preparation of an EIS
  • Procurement of statutory consents
  • Design review
  • Structural design
  • Contract documentation
  • Landowner and stakeholder liaison
  • Construction supervision
  • M&E design tender assessment

Challenge

RPS were tasked with eliminating foul flows from the North Dublin catchment to the sea at Howth, Co. Dublin. This project presented a number of complex challenges associated with the reversal of foul flows. A number of significant environmental and archaeological constraints existed on the route, which crosses a busy shipping lane in Dublin port. In addition, beach foreshore sections and the close proximity to sensitive bird habitats around Bull Island had to be factored into the design.

Solution

RPS delivered the following solution for Dublin City Council & Fingal Co. Council:

  • Design of 5.6km Gravity Sewer and a 2.5km Rising Main ranging in size
  • Create drainage area plans or strategic models for foul/combined sewerage network catchments
  • Supervise 2,000,000m3 of sand being dredged and safely avoid an uncharted 17th century shipwreck
  • Supervise construction of a 1400mm x 11km submarine pipeline in sections using a 300 tonne linear winch. 
  • Design the rehabilitation of 2.6 km of sewers within the town centre area using trenchless lining technology
  • Constant liaison with the Port Authorities and local interest groups was also managed by RPS to ensure safety of all vessels during the works
Construction workers supervising installation of 1400mm x 11km submarine pipeline in Dublin Bay.

Project statistics

2,000,000
Metres cubed of sand dredged
11
Kilometers of 1400mm diameter weld jointed steel epoxy lined pipeline laid.
4.6
Kilometers of sewers
20
Divers

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