Client: BAM Nuttall (on behalf of the Environment Agency)
Duration: 2 months
Location: Ormesby Beck,
Overview
The Environment Agency commissioned BAM Nuttall to remove the existing tidal gates at Ormsey Beck as part of a wider flood management and infrastructure improvement programme. The works required a temporary arrangement that would allow the controlled demolition of the structure while maintaining both river flow and tidal movement. A safe, watertight, and environmentally sensitive solution was essential to mitigate flood risk and protect the surrounding watercourse during construction.
Why RN were chosen
We were chosen for our proven expertise in water control and innovative approach to temporary works design. Experienced in delivering construction projects in riparian and inshore environments, the team was trusted to develop a bespoke solution that eliminated the need for mechanical over-pumping. The approach balanced structural stability, flow management, and environmental protection during the tidal gate removal.
Solution / Delivery
Working in partnership with BAM Nuttall, we designed and proposed a temporary works arrangement that allowed the safe demolition of the tidal gate structure while maintaining continuous river flow. The system combined our Geodesign Barriers upstream and downstream with a central partition formed from modified sectional formwork braced from the channel walls.
This configuration effectively created an open flume through the site, maintaining the necessary cross-sectional area for tidal surcharge and reducing flood risk. Dewatering pumps were operated continuously to sustain the seal and keep the work area dry throughout demolition.
The team planned the sequence carefully: half of the structure was isolated and demolished first, maintaining water movement through adjacent gates. Once complete, the arrangement was reversed to isolate and dewater the remaining section.
By integrating robust engineering design with precise site planning, we enabled BAM Nuttall to complete demolition safely and efficiently, with minimal environmental impact and full hydraulic continuity maintained throughout the operation.