Summary
The Cherrywood Regional Attenuation Pond 5A scheme delivered a piece of stormwater management infrastructure critical to future development within the 360ha Cherrywood strategic development zone (SDZ) in south Dublin. The scheme provides the final stage of treatment to surface water runoff from the upstream catchment, reduces flood risk on the receiving water environment and enhances biodiversity in the Cherrywood area.
ROD was appointed by Dún Laoghaire Rathdown County Council in 2020 to review and update the detailed design, prepare contract documents, oversee the procurement of a contractor and provide contract administration and site supervision services during the construction and handover stages of the scheme. ROD also acted as Project Supervisor for the Design Process and provided head office engineering and ecology support during construction.
Work began on site in July 2024, with Clonmel Enterprises Ltd as the contractor and Project Supervisor for the Construction Stage.
The scheme was successfully delivered within an eight-month construction programme.
Solution
The project involved the construction of a sediment forebay pond, regional attenuation pond and approximately 320m of greenway at Cherrywood.
Close cooperation between the project team, which included ROD Managing Director Marc Jones as the lead of both the design and construction teams, and the contractor was key to its successful delivery.
The scheme included:
• extensive earthworks
• drainage installations
• decommissioning of an existing attenuation pond
• diversions of high voltage ESB underground cables
• diversions of Uisce Éireann watermains
• installation of public lighting
• pavement construction
• installation of kerbs, footways, signage and markings
• landscaping works
Highlight
The stormwater network and greenway provide the necessary infrastructure to accommodate development within the catchment and pedestrian and cyclist facilities that will ultimately link with future complementary greenway and linear park schemes in Cherrywood and Brides Glen.
Challenges
- Diversion of approximately 220m of existing high voltage ESB underground cables and 25m of existing 315mm diameter watermain
- Protection of approximately 125m of an existing 20-inch diameter asbestos trunk watermain that crossed the site
- Installation of approximately 95m of 525mm diameter stormwater pipe within an existing urban road containing a high density of utilities and services
- Management of incoming flows to the existing pond during the decommissioning phase
- Monitoring, protection and translocation of several habitats and amphibians during the construction stage
Services provided:
- Engineering consultancy
- Environmental engineering
- Contract procurement
- Contract administration
- Site supervision
- PSDP
- Ecological site support
