Greater Dublin Drainage has its origins in the key findings of the Greater Dublin Strategic Drainage Study (GDSDS). This study took a high level view of the wastewater drainage and treatment requirements of the Greater Dublin Area and its key findings were the subject of a Strategic Environmental Assessment.

To guide the future provision of wastewater infrastructure in the GDA, the Greater Dublin Strategic Drainage Study (GDSDS) Final Strategy Report and its subsequent Strategic Environmental Assessment (SEA) were prepared in 2005 and 2008 respectively on behalf of the seven local authorities that form the GDA.

The Project Team completed site selection in 2013 and identified that the best solution for the future development of wastewater treatment capacity in the wider Dublin region comprises:

• an underground orbital sewer and two pumping stations;
• a wastewater treatment plant (WwTP) on a 23-hectare site at Clonshagh (Clonshaugh);
• an outfall pipe from the wastewater treatment plant discharging 1km north-east of Ireland’s Eye.