Cork Lower Harbour Main Drainage Project
The Cork Lower Harbour Main Drainage Project has reached a significant milestone as raw sewage from Cobh Town is now treated before its safe discharge to sea. This final step in the Cork Lower Harbour Main Drainage Project brings to an end the decades long practice of discharging the equivalent of 40,000 wheelie bins of raw sewage into Cork Harbour every day.
Irish Water invested €144 million in the Cork Lower Harbour Main Drainage Project to address this issue and to ensure that wastewater from the agglomerations of Ringaskiddy-Crosshaven-Carrigaline, Ringaskiddy village, Passage-Monkstown and Cobh town, is collected and fully treated before safe discharge to the sea through an outfall at Dog Nose Point.
Irish Water constructed a state of the art wastewater treatment plant in Shanbally connecting the towns of Crosshaven and Carrigaline, so that by 2017 the equivalent of 20,000 wheelie bins of raw sewage was treated daily.
The sewer network was then expended to connect the towns of Ringaskiddy, Shanbally, Passage West and Monkstown to the treatment plant, so that the equivalent of 30,000 wheelie bins daily of raw sewage was treated by early 2019.
A vital link between Cobh and Monkstown was then created by completing two of the longest horizontal directional drills in the country to install sewer pipes some 60m under the Lee Estuary – a feat of engineering.
The Cobh Networks contract is the final part of the Cork Lower Harbour Project and included building 7km of sewer pipes and 5 pumping stations in Cobh. This expanded network collects the raw sewage from the town of Cobh that until now, discharged untreated through 19 outfall pipes directly to the harbour.
What's happening now?
Raw sewage from Cobh Town is now treated before its safe discharge to sea.
The Cobh Network Contract has expanded the sewage network in Cobh Town by building 7km of sewer pipes and 5 pumping stations so that water is now pumped to Cork Dockyard Pumping Station.
From Cork Dockyard Pumping Station raw sewage is pumped under the Lee Estuary to Monkstown and on to Shanbally Wastewater Treatment plant for treatment before its safe return to sea.
The opening of the Cork Dockyard Pumping Station marks the end of the raw sewage discharge in Cobh Town. This important milestone means that the overall project is now treating 40,000 wheelie bins of raw sewage daily before its safe discharge into the sea and 20,000 homes are now connected to the new scheme.
Final works including finishing, reinstatement and decommissioning works will continue in the coming months.
Cork Lower Harbour Main Drainage Project – The Journey – video here.
Drilled Estuary Crossing video of works here.
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Cobh Network works: text COBH to 50015