Thousands of fish are being rehomed to another section of the Kennet and Avon Canal while a new pumping system is being installed at Crofton. A section of the canal at Crofton, bordering Wilton Water, has been drained and fish rescue operatives are busy catching the fish and moving them to their new home. Using a technique called ‘electrofishing’ they estimate they have caught over 20,000 fish and there are thousands more still to be moved.
The Canal & River Trust’s 1.8 million project to replace the 40 year-old pumping system at Crofton, will ensure the charity can keep the summit of the Kennet & Avon Canal topped-up with water for boats, towpath users and wildlife. The project started in September and will be completed by March 2023.
To enable the works to be carried out, a six-mile stretch of the Kennet & Avon Canal, from Lock 52 (Heathy Close Lock) to Lock 65 (Burnt Mill Lock), has been closed to boats from 7 November 2022 until 17 March 2023. A diversion is also to be in place for the half-mile stretch of the towpath that is closed between Lock 58 and Lock 61 on the Crofton flight.
Charles Baker, the Canal & River Trust’s senior project engineer, explains: “Crofton sits at the top of the eastern descent of the Kennet & Avon Canal. The pumping system at Crofton keeps the canal summit topped up with water, which is vital for boaters and wildlife, as well as the thousands of people who visit the canal towpath each year for their health and wellbeing.
Originally, back in the 19th Century, the pumps were steam operated. However, the current pumps date back to the 1980’s and are electric powered, and after 40 years of service, the pumping system has become unreliable and inefficient.
With the Kennet & Avon Canal more popular with people and boats than at any time in history, the new pumping system will increase efficiency and the amount of water that can be pumped into the canal to keep it topped up.
To complete the works, we’ve drained a section of the canal, and are rescuing the thriving population of fish living there. Draining a stretch of canal is a rare event, and we are expecting to collect hundreds of pounds of fish, including some very large and ecologically important specimens. The species we’ll rescue are likely to include roach, pike, bream, gudgeon and perch.
To carry out the fish rescue, we employ specialist contractors who use electrofishing. This involves passing an electric current through the water to temporarily disengage the ability of the fish to swim. They can then be easily netted, placed in large containers of water where they can recover for a few minutes, before being rehomed in a nearby section of canal that isn’t being drained.”
The pumps at Crofton supply water from Wilton Reservoir to the Kennet & Avon Canal. Soon after the canal first opened, Crofton Pumping Station was built in 1807-9 to supply water to the highest point of the Kennet & Avon Canal. The pumps were steam powered and continued to operate until 1959. In the 1980’s, when the canal was restored, a new pumping station was installed powered by electric pumps. The steam-powered pumps housed in the historic Pumping Station building continue to be regularly operated by volunteers at public open days, when they continue to pump water to the summit level.
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