Cork City Water Supply - Western Trunk Watermain

Irish Water is progressing with significant upgrades to the water network across Cork City.

Irish Water, in partnership with Cork City Council, is working to improve the security of water supply across Cork City through the delivery of three projects as part of the Cork City Water Supply Scheme. Farrans Construction is delivering these three projects on behalf of Irish Water.

Western Trunk Watermain
Eastern Strategic Trunk Watermain
Shanakiel Watermains Upgrades

We areupgrading Cork City trunk watermains to increase security of supply and reduce leakage of large strategic mains in Cork City.

Western Trunk Watermain
This project involves the construction of a 5.5km link between the Cork City Water Supply Scheme and the Cork Harbour and City Water Supply Scheme, as supplied from Inniscarra Water Treatment Plant. This watermain will provide additional water supply capacity to Cork City by providing a strategic connection between the water supply schemes and will provide necessary headroom, to facilitate growth and also increase security of supply.

In Progress

What is involved as part of this project?

As part of this project Irish Water will:

  • Connect to an existing 1500mm diameter city and harbour trunk (city ring) main at Curraheen.
  • Construct a new 5.5 km trunk main connecting to the Cork City WSS at Lee Road Water Treatment Plant.
  • This project will include a crossing of the River Lee and critical road arteries into Cork City.
  • Connect to the Lee Road Water Treatment Plant and new pumping regime and into existing network.

What are the benefits of this project?

The works carried out as part of this project will:

  • Provide security of supply to Cork City
  • Provide necessary additional water supply capacity
  • Facilitate growth and development of Cork City

Details of upcoming works:

LocationStart dateEnd datePlanned WorksTraffic Management
Private lands between Scotch Lane/O’Shea’s Lane and Clash Road
06 January 2022

25 February 2022

Installation of new water mains
Clash Road 10 January 2022 14 January 2022 Road crossing to facilitate installation of new water mains Road closure will be in effect. Traffic management will be in place for the duration of the works & local & emergency access will be maintained.

Pipe installation works are continuing along the route of Western Trunk Watermain as illustrated by the blue line in Figure 3 below.

Pipeline route and area of works

In addition works are required to facilitate the installation of a new watermain on Clash Road at the Carriganarra side of the Field of Dreams entrance. These works will require a road closure and traffic management will be in place from Monday 10th January 2022 until Friday 14th January 2022 to facilitate local access and advise motorists. Please see Figure 2 below for diversion routes and area of the road closure. Local and emergency access will be maintained at all times.

Clash Road Work and Diversion Route

Stakeholder Engagement

We will endeavour to keep all stakeholders, businesses and residents informed in advance of the commencement of this project and as this essential water supply scheme progresses. Further details on the timelines shall be provided in the coming weeks.

For any further queries, there is a dedicated Information line available 24/7 at (047) 39999 and project email at

Frequently Asked Questions

What are the working hours?
Monday to Friday, 8am to 6pm.

Will access to the Lee Fields carpark be affected during the works?
No, there will be no access restrictions to the carpark during the works.

What will be done with topsoil removed as part of preparatory works?
Topsoil will be temporarily stored within the works area and will be used to reinstate the area following installation of the pipeline.

How will the works area be secured?
All excavated areas will be securely fenced off.

Will trees need to be cut down?
No, tree removal will not be required as part of these works. Minor branch cutting works were completed in early June to ensure a safe working space for works. A survey was carried out by a qualified Ecologist who determined that this activity falls under the exemption described in Section 40 (2) (e) of the Wildlife Act (exemption from the prohibition on vegetation cutting in the course of road or other construction works).

What was done with the mulch from the cut branches?
Mulch was given to Field of Dreams / Down Syndrome Cork at the Clash Road as part of their raised beds and vegetable garden projects.

Will the pedestrian walkway along the Lee Fields be affected?
No, the works will not have any impact on the pedestrian walkway running along the Lee Fields.

How will the excavated areas be reinstated following completion of works?
The area will be topsoiled using the original topsoil and seeded back to grass. This will be completed by the end of September 2021. Full reinstatement with established grass regrowth is expected in Spring 2022.