Case Study

Upper Liffey Valley Sewerage Scheme

OVERVIEW

Coffey were the Main Contractor and Our Client.

The project involved Phase 3 Contract 2B of Expansion and Upgrade of the Upper Liffey Valley Regional Sewerage Scheme, which serves several towns in North Kildare, including Naas, Newbridge, Sallins, Clane, Kill; and connects the wastewater collection network to a regional Wastewater treatment plant at Osberstown in Naas.

The completed scheme provides a collection network which is in line with modern practices and compliant with current environmental legislation and sustainability principles.

The scheme extended across three separate collection network catchments in north Kildare and included the upgrade of an existing wastewater pumping station at Sallins, to provide a pass forward flow rate of 260l/s and a storm tank of 1,100m3 capacity , the construction of two new wastewater pumping stations on existing sites at Clane (to provide a pass forward flow rate of 180 l/s, storm pumping rate of up to 510 l/s and a storm tank of 1,280m3 capacity) and Monread (to provide a pass forward flow rate of 192 l/s and a storm tank of 800m3 capacity).

The pumping stations at Clane and Monread were architecturally designed to meet the requirements of the planning authority, with a natural stone finish to the curved façade at both sites.

The project also included the construction of approximately 9km of rising mains and 10km of gravity sewers, with a significant element of the works through the busy trafficked areas of Naas, Newbridge, Sallins and Clane.

The rising main and gravity sewer sections involved trenchless crossings of the M7 motorway, the Grand Canal and the River Liffey.