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  • Marine Construction licence ML2023024 Var 1 - Strathfoyle Sewage Siphons Upgrade

    Topics:
    • Marine, 
    • Marine licensing and permits

    Date published: 25 March 2024

    Last updated: 4 April 2025

    The Proposed Scheme is to upgrade the existing Strathfoyle Siphons, which are located within the Culmore catchment of Derry City

    Proposal Description

    Reference: ML2023024 Var 1
    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: 22/03/2024 

    Documents

    • Marine Construction Licence Application FormAdobe PDF (252.83 KB)
    • Final Marine Construction Licence - Strathfoyle SiphonsAdobe PDF (870.85 KB)
    • Marine Construction Licence - Strathfoyle Siphons - ML2023024 - Variation 1Adobe PDF (983.13 KB)
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