Dublin City Council is proposing a mammoth 9km sewage outfall pipe to help make Dublin Bay cleaner - at a cost of €220m.

Herald.ie reports that the 5m-wide pipe - longer than the Dublin Port Tunnel - would dump effluent from the Ringsend treatment plant far offshore, thereby avoiding pollution in the bay and sensitive areas such as Bull Island, which recently lost its EU Blue Flag status for Dollymount Strand.

Plans for the project, which DCC head of waste Pat Cronin described as the "greenest and most economic solution" will be open to public consultation in the near future, with a timetable for completion by 2015.

The pipeline and redeveloped treatment plant will be funded via the Department of the Environment's water services investment programme.