Project Title: 

Cork Lower Harbour Main Drainage Scheme

Location:

County Cork

Client:

Irish Water / Ervia

Date:

2021

Business Sectors: 

Water/Waste Water Resource

Services (Technical Disciplines):

• Feasibility
• Preliminary Design
• Detailed Design
• Tender Dosiers
• Procurement
• Construction Supervision
• Construction Management
• Capacity Building

Our Role:

• Design Review
• Options Appraisal / Feasibility Studies
• Development and calibration of Hydro works network models
• Asset inspection and condition assessment of 63kms of underground drainage network (including topographical survey and CCTV inspection)
• Preparation and calibration of detailed hydraulic model of underground drainage network (1,537 nodes)
• Preparation of Network Contract Documents (Traditional)
• Rehabilitation of 10km of sewer via re-lining
• Preparation of DBO Contract Documents for WWTP (FIDIC – Gold)
• Tendering Process for DBO/Traditional Contracts
• Project Supervisor Design Process (PSDP) for Network Contracts
• Project Supervisor Design Process (PSDP) for WWTP until DBO Contract Award
• Contract Administration and Construction Management of DBO and Traditional Contracts
• Construction Supervision (FIDIC)

Project Objectives/ Outcomes:

The Cork Lower Harbour Main Drainage Scheme (Cork LHMDS) serves the population/industrial centres of Cobh, Carrigaline, Crosshaven, Passage West, Monkstown, Glenbrook, Ringaskiddy Shanbally and Coolmore. The existing sewer network serving the Lower Cork Harbour area comprises mainly of combined sewer systems. Wastewater from Cobh, Carrigaline, Passage West/Monkstown and Ringaskiddy is currently discharged following preliminary screening or untreated into the Harbour. It was proposed to transfer wastewater from the Cork Lower Harbour to a new 80,000pe (Full Treatment Capacity of 54,000 m³/d) wastewater treatment plant site at Carrigaline. The final effluent will be discharged to Cork Harbour via and existing submerged outfall. The scheme includes the construction of eight main pumping stations and approximately 57km of new/upgraded sewers (ranging from 225mm to 1,050mm), rehabilitation of existing trunk sewers and surface water separation where economically viable. A section of 1,000m will be constructed by tunnelling. Nicholas O’Dwyer completed the preliminary investigations, design, contract documents, tendering/procurement, construction supervision and contract administration for the project.

Geoscience Ireland Contact:

Michel Davitt – mdavitt@nodwyer.com