Project Summary
Coffey delivered the Saggart Reservoir Design Build Contract for Uisce Éireann (Irish Water). The project involved constructing a 100 Ml covered potable water reservoir with associated infrastructure, providing increased storage capacity and resilience for the Greater Dublin Area’s water supply.
Project Description
Located at Slade Road, Saggart, Co. Dublin, this project addressed the requirement for additional effective storage to support operations and transfer of treated water from the site to strategic reservoirs in the region. The works also included a new on-site electro chlorination plant (OSEC building) to replace the existing plant that had reached the end of its service life.
Scope of Works
The works included:
Construction of a two-compartment 100 Ml reservoir, with inlet and outlet valve houses
A new OSEC building housing an ESB substation, chlorination and de-chlorination plants, backup generator, controls, and welfare facilities
Diversion and installation of new pipelines to integrate the new reservoir with existing supply networks
Decommissioning and demolition of existing reservoirs and redundant structures
Surface water management systems, including attenuation and scour pipelines
Refurbishment of the existing OSEC building and associated reinstatement and landscaping works
90-day operation and maintenance period to ensure optimal handover
Technical Highlights
The new reservoir covers a footprint of 31,500 m² and required 175,000 m³ of excavation, with reuse of materials on site. Construction included over 28,000 m³ of in-situ concrete and 3,500 tonnes of steel reinforcement. Significant mechanical and electrical works were also delivered, integrating the new OSEC plant with dosing, sampling, and control systems.
Environmental and Community Measures
The project featured robust environmental safeguards, including sediment management and biodiversity enhancements such as an attenuation pond with native vegetation. Community engagement was prioritised with regular updates and measures to minimise disturbance.
Added Value
Coffey introduced cost-saving measures including:
Using steel pipe in key chambers, reducing cost and improving durability
Design changes that eliminated the need to demolish one existing tank, saving time and expense
Implementation of high-GGBS concrete for carbon reduction
Relocation of flow meters to valve houses to improve maintenance access and eliminate confined space working
