Protecting a Precious Species: South West Water Installs State-of-the-Art Eel Screens at Lopwell Dam

The River Tavy at Lopwell is an important source of drinking water, and is also a haven for wildlife. Recognising its dual role, South West Water has installed cutting-edge intake screens to safeguard eels and other aquatic species, while continuing to provide safe, clean water to the region.

European eel populations have plummeted by more than 90% over the past 40 years. These extraordinary animals begin life thousands of miles away in the Sargasso Sea off North America, drifting across the Atlantic on ocean currents before settling in European rivers. At the end of their lives, they return to the Sargasso Sea to spawn, completing one of nature’s most incredible migrations.

The Eels Regulations aim to protect this critically endangered species, and South West Water is proud to play its part.

At Lopwell Dam, the company has upgraded its intake system with specially designed screens to minimise impacts on young eels and fish, ensuring they remain safe during their river journey.

Phil Turnbull, Fisheries Lead Advisor at South West Water, explained: “With our intakes, we’re interacting directly with wildlife under the water. These new screens provide the highest level of protection, preventing young eels and juvenile fish from being drawn into our systems while also keeping debris out. As a team, we’re committed to doing everything we can to protect nature while delivering essential services.”

The screens incorporate two crucial features to protect eels:

• Tiny gaps of just 2mm ensure juvenile eels cannot pass through.
• Reduced water flow speeds give the eels time to swim away safely.

Mike Lakin, Technical Director for Engineering at Fishtek, added: "These screens create a fine filter that stops eels from being drawn into the pumps that deliver river water to the Plymouth water treatment plant. With gaps as small as 2mm, debris can build up quickly, especially in autumn, so the screens are fitted with automatic cleaning systems that use water spray to keep them clear and effective.

“At Fishtek, we’re passionate about combining clever engineering with conservation. It’s great to be able to make river intakes safer and help rebuild fragile ecosystems for future generations.”

The investment at Lopwell Dam is already making a positive difference. Sensors constantly monitor the water flow, triggering the screen-cleaning process as needed. This ensures a steady water supply while safeguarding the delicate early stages of the eels’ remarkable life cycle.

Phil Turnbull concluded: “The whole point of the Eels Regulations is to help increase the number of eels returning to the sea. By protecting juveniles at our intakes, we’re giving them the best chance to grow, migrate, and ultimately help rebuild their populations. It’s incredibly rewarding work.”