Cobh Sewerage Scheme, Cork

Cobh Main Drainage forms part of the Cork Lower Harbour Scheme which was awarded to Farran Sorensen Joint Venture (FSJV). The purpose of the project is to intercept existing untreated raw sewage discharging via overflows into the Cork Harbour. The purpose of the Cobh Main Drainage Contract is to convey surface and foul flows from the network to Dockyard Pump Station and from there to pump all flows from the Cobh catchment under the River Lee via the major twin siphon constructed under Contract C.

We were appointed as the designer to FSJV for the Cobh Main Drainage project. We undertook the full civil, structural & fire design of all pump stations. This included coordination with the M&E designer in the sizing of storm tanks, channels, and the above ground control building. We also undertook the role of Assigned Certifier for Dockyard Pump Station undertaking the statutory duties required under BCAR.

The project comprises gravity sewers (foul, storm and combined) and rising mains, five Pumping stations and five marine outfalls for emergency overflows. The total length of the sewers is 3.4km, the sewer diameters vary in size from DN225 to DN1050. The total length of the rising mains is 3.3km, the rising main diameters vary in size from DN90 to DN400. Five Marine Outfalls of total length 365m have also been constructed varying in diameters from DN250 to DN900. The pipelines and rising mains have been constructed from concrete, HDPE, Ductile Iron and OPvC, all in accordance with the relevant standards.

A key features of this project is we were the contractor designer and designed seven kilometres of sewers, including five marine outfalls.