Sliding Flood Gates

Heavy-duty flood protection for wide openings

Each gate is custom-designed and manufactured in our UK facility to suit the site geometry, flood levels and operational requirements. Using a hydraulically lifted leaf and guided sliding system, the gate can be safely deployed by a single trained operative, even at significant widths and flood heights.

Our sliding flood gates are widely used on coastal defence schemes, water and wastewater treatment works, substations, highways infrastructure and other critical assets where resilience, durability and reliability are essential.

Controlled, single-person operation

The sliding flood gate is designed to be operated safely and efficiently by one individual. Hydraulic lifting cylinders raise the gate leaf clear of the threshold, allowing it to travel smoothly on castor assemblies along the guide rail. Manual winches, housed in lockable enclosures, provide controlled movement into the open or closed position. Once closed, the gate is lowered onto the stainless steel threshold, compressing the base seal to form a watertight barrier. All operating components are securely enclosed to prevent unauthorised use.

Engineered to suit your site

Every sliding flood gate is designed in-house by our experienced engineering team. Gate width, height, flood protection level, wall interfaces and operating arrangements are all tailored to the specific project. We work closely with designers, contractors and asset owners to ensure seamless integration with flood walls, existing structures and finished ground levels. Options include primary and backup hydraulic systems, bespoke access arrangements and finishes to suit coastal or industrial environments.

Built for extreme environments

Our sliding flood gates are engineered for longevity in harsh conditions. The gate leaf is fully welded, enclosing a structural steel matrix to prevent water ingress and maximise strength. All steelwork is blast-cleaned and protected with a high-performance C5 marine-grade paint system, with stainless steel used for exposed fixings, seals and threshold components. With minimal moving parts and robust detailing throughout, the system requires low routine maintenance and is always ready to perform when needed.

Typical applications

• Coastal and tidal flood defence schemes

• Water and wastewater treatment works

• Electrical substations and utilities infrastructure​​​​​​​

• Highways, underpasses and access roads

• Industrial and critical facilities requiring wide clear openings

On NRW's Stephenson Street flood scheme in Newport, a 9 m sliding flood gate designed and manufactured by MM Engineering closes Corporation Road beneath a railway bridge.