Marine Construction licence MLVAR2025036 - Strathfoyle Sewage Siphons Upgrade
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Date published:
The Proposed Scheme is to upgrade the existing Strathfoyle Siphons, which are located within the Culmore catchment of Derry City
- Reference: MLVAR2025036
- Project Type: Construction
- Location: Strathfoyle, Lough Foyle
- Coordinates: IGR 246600 421380
- Project Description: The Proposed Scheme is to upgrade the existing Strathfoyle Siphons, which are located within the Culmore catchment of Derry City. The siphons are currently not passing forward their required design flow and there are issues with regards to access for maintenance and cleaning. The existing twin siphons are critical to Derry City’s sewerage infrastructure as they are required to transfer the equivalent of a third of the sewage generated within the city from the East to the West bank of the River Foyle. The twin siphons currently cross under the River Foyle at Strathfoyle and transfer influent to a gravity trunk sewer, which gravitates from the east bank of the River Foyle to the Culmore Wastewater Treatment Works (WwTW).
- Applicant: NI Water
- Status: Active
- Date Licence Issued: 10/09/2025
- Date Licence Expires: 31/10/2026