Flood Defence Pumps
When water levels rise, the pump has to work. Aquatic Control Engineering supplies, installs and maintains the full range of flood defence pumps — fish-friendly centrifugal (rotodynamic) pumps, Archimedean screw pumps, axial, mixed-flow and vertical turbine units — for internal drainage boards, water companies, the Environment Agency, local authorities and principal contractors. Because we are not tied to a single pump type, we specify the one that genuinely suits your head, flow, site footprint and environmental obligations. From feasibility and CFD modelling through to supply, installation, commissioning and lifetime support, we deliver the complete pumping solution.
Fish-Friendly As Standard
Modern flood defence schemes have to protect people and fish. Our fish-friendly centrifugal pumps have been independently tested to pass 100% of eels and over 97% of fish unharmed, while Archimedean screw pumps use a specially profiled leading edge that removes strike points and turbulence altogether. Both options help you satisfy Environment Agency and Natural England requirements without compromising pumping capacity.
Every Pump Type, One Supplier
Centrifugal, Archimedean screw, axial, mixed-flow, end-suction and vertical turbine — we supply them all, from Pentair Fairbanks Nijhuis and Fishflow Innovations. That independence matters. Instead of forcing your scheme to fit one product, we select the pump that delivers the required duty at the lowest whole-life cost, and we back it with in-house engineering, installation and maintenance teams.
Refurbishment & Retrofit
Much of the UK’s flood defence pumping infrastructure is decades old. We upgrade existing stations rather than rebuild them — replacing pumps, drives, screens, penstocks and controls within the existing chamber wherever possible. Minimal civil works means lower cost, shorter programmes and less time with the station off line during the flood season.
About Flood Defence Pumps
Flood defence pumping is a low-head, high-volume duty: moving very large quantities of water against a lift of only a few metres, reliably, often at short notice and frequently through screened but debris-laden water. That combination rules some pump types in and others out. Centrifugal and axial units give high capacity in a compact chamber; Archimedean screw pumps handle silt, weed and suspended solids at excellent efficiency in a simple structure. We use 3D modelling and CFD analysis to prove the selection before anything is ordered.
Our Flood Defence Pump Options
01
Fish-Friendly Centrifugal Pumps
Pentair Fairbanks Nijhuis rotodynamic pumps with a smooth, rounded impeller leading edge and wide clearances. Independently tested at 100% eel and over 97% fish survival. Vertical or horizontal, wet-well or dry-well, with flows to 180,000 m³/h. The high-capacity choice where footprint is tight and heads reach up to around 8 m.
02
Archimedean Screw Pumps
Fishflow Innovations enclosed-tube screw pumps for gentle, low-head, high-flow transfer. The tubular drum removes leakage and slip, the profiled leading edge removes strike points, and a reverse facility lets aquatic life escape. Silt, weed and vegetation pass without blockage — ideal for drainage boards, wetlands and habitat schemes.
03
Axial, Mixed-Flow & Vertical Turbine Pumps
Where head and flow vary widely across the season, or where a compact, robust installation is the priority, axial and mixed-flow units from the Pentair range give high volumetric output at very low heads. Vertical turbine and end-suction configurations suit deeper sumps and transfer duties.
04
Complete Flood Defence Pumping Stations
Pumps are only part of the answer. We design and build the whole station — weedscreens and screen cleaners, penstocks and flap valves, non-return valves, pipework, control panels, telemetry and standby provision — as a single package, installed and commissioned by our own site teams.
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Frequently Asked Questions
It comes down to head, flow, the water you are pumping and the structure you already have. As a rule of thumb, Archimedean screw pumps suit low heads with high flows and debris-laden or silty water in an open channel arrangement; centrifugal, axial and mixed-flow pumps suit higher capacities, deeper sumps and tighter footprints. We assess the site, model the options and recommend the arrangement that gives the best whole-life value — not simply the pump we would prefer to sell.
They can be, and increasingly they have to be. Our fish-friendly centrifugal pumps use a specially shaped impeller with smooth leading edges and wide clearances, independently tested to pass 100% of eels and over 97% of fish unharmed. Archimedean screw pumps achieve the same outcome by design, with no pinch points and a leading edge shaped to reduce splash, turbulence and direct strikes. Both are proven in protected sites and regulated watercourses.
Yes — station refurbishment is a large part of what we do. We survey the existing structure, model the hydraulics, and replace pumps, drives, screens, penstocks, valves and control systems within the existing civils wherever it is practical. Variable-speed drives are often added at the same time, cutting energy use and noise. The result is a modern, compliant, fish-friendly station at a fraction of the cost of a new build.
Throughout. Our team offers full technical support including CFD analysis, 3D modelling and decades of pumping station experience to optimise selection, layout and installation. We install and commission with our own site teams, and support the asset afterwards with planned maintenance, servicing and spares — so the station is ready when the water arrives.
Related Projects
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More About Flood Defence Pumps
01 — Proven Flood Resilience
High-capacity, low-head pumping designed to perform when it is needed most, with standby provision and telemetry options for unattended sites.
02 — Environmental Compliance
Fish-friendly options across the range, with independently proven survival rates of over 97% for fish and 100% for eels.
03 — Debris & Silt Tolerance
Screw pumps pass silt, weed and suspended matter without blockage; screening, screen cleaners and non-return valves protect the whole station.
04 — Energy Efficiency
Variable-speed drives hold efficiency at reduced speeds, cutting running costs, noise and wear while improving fish passage.
05 — Whole-Life Support
UK-based design, supply, installation, commissioning and maintenance from one team, with spares and servicing for the life of the asset.
Technical Specifications (Typical):
• Pump types — fish-friendly centrifugal (rotodynamic), Archimedean screw, axial, mixed-flow, end-suction and vertical turbine
• Installation — vertical or horizontal; wet-well or dry-well; open or enclosed screw
• Flow rates — from around 100 l/s to 180,000 m³/h, depending on type and diameter
• Head range — approximately 0.5–8 m, typical of flood defence and land drainage duties
• Materials — steel, stainless steel and composite options to suit water quality and exposure
• Drives — fixed or variable speed, with VSD compatibility for efficiency and fish passage
• Fluid compatibility — fresh water, surface water, brackish water and screened wastewater
• Fish passage — independently tested at 100% eel and over 97% fish survival (fish-friendly units)
• Ancillaries — weedscreens, screen cleaners, penstocks, flap and non-return valves, controls and telemetry
• Bespoke — larger and non-standard units engineered to project requirements
