United Utilities has successfully installed Europe’s largest valve at its Bromborough Wastewater Treatment Works to protect homes and businesses from the risk of tidal flooding.
Marking a major milestone for the area, the installation prevents tidal backflow from entering the system during high tides. This not only protects vital coastal infrastructure and helps improve water quality in the River Mersey but also reduces odours at the outfall.
Developed by Swedish-based water technology company Wapro, the custom-built valve was installed within the existing 2.4-metre-diameter storm outfall pipe at Bromborough using a slip-lining method.
The valve was lifted into place using cranes and precisely guided into position. The slip-lining technique allowed the valve to be inserted without the need for new pipework or major civil works, reducing installation time and environmental impact.
Its design ensures that stormwater flows freely out while preventing tidal water from entering the system—safeguarding the treatment works and surrounding assets.
Steven Kenyon, County Business Lead for Wastewater in Merseyside said:
“This installation represents a significant step forward in our commitment to sustainable water management.
“By partnering with Wapro, we’ve used cutting-edge valve technology that enhances resilience against tidal flooding while supporting our environmental goals.
“This project demonstrates how precision engineering and environmental stewardship can go hand in hand.
“By integrating Wapro’s innovative valve technology, we’re not only protecting our infrastructure but also contributing to the long-term health of the River Mersey.”
Lotta Hall, Marketing Manager, Wapro, added:
“The installation at Bromborough demonstrates how practical, well-engineered solutions can address complex flow challenges in a sustainable way.”
The strategic investment aligns with United Utilities’ broader mission to deliver £13 billion worth of investment across the North West over the next five years to 2030, championing environmentally friendly infrastructure that protects communities and ecosystems across the region.
WaterBriefing is supporting the upcoming Floodex & National Drainage Show which takes place in London on 26 – 27 November 2025 in London. Now in its tenth year, Floodex will run alongside the National Civils Show, opening the event up to whole new audience of thousands of interested civil engineers, contractors, developers and planners, involved in construction, utilities, highways, railway and coastal defence professionals.
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