Found in the Surrey market town of Walton-on-Thames – roughly 15 miles from central London – plans for the QEII Reservoir were first drawn up in 1935 before construction began a year later. While work was suspended during the Second World War, it restarted in 1957 before the reservoir was formally opened by its namesake in March 1962.
Now, just shy of the site’s diamond jubilee, £25 million worth of improvements to ensure a further century of service are drawing to a close.
As per the Reservoirs Act 1975, the assets must be inspected at least every 10 years, with Thames Water – which serves 15 million customers across London and the Thames Valley – using the latest mandated checks as an opportunity to examine, clean and maintain the transfer tunnels that feed water to and from the QEII.
When complete, the scheme will help prevent future leaks, avoid potential supply restrictions and ensure a design life of up to 100 years.