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Thames Water's London Ring Main marks 25 years in action

Thames Water's London Ring Main - a pipe which carries up to 1,300 million litres of water a day – has been in action for 25 years.

The Ring Main carries water across almost every London borough and was officially opened by Her Majesty The Queen on 11 November, 1994. At the time, at 50 miles long, it was the longest tunnel built in the UK, longer than the Channel Tunnel, which opened less than six months earlier, and was dubbed by the national press as ‘the M25 for water’.

The pipe, which took seven years to construct, carries high-quality drinking water from five of Thames Water’s largest water treatment sites around the capital to around 3.5 million customers and was developed to meet the water demand of a growing population. The underground ring is located 30 metres deep and is 2.5 metres wide, and was constructed in a way designed to reduce the need to dig large trenches in multiple roads for pipes to be laid in. Instead, an underground tunnel boring machine was used to create the tunnel without the need for widespread disruption above London’s busy roads.

Gareth Parry, Thames Water’s head of water production, said: “The Ring Main was an amazing example of innovation in its day, was delivered on time and within budget, and is still a pivotal part of our water supply network in 2019, enabling us to provide world-class tap water to millions of people across London. The fact it was opened by HM The Queen shows just how special it was at the time. It’s a testament to the project team, who had the vision to plan so far into the future, that we still consider it to be one of the most important pieces of infrastructure we rely on today.”

The project team, most of whom have now retired, held a reunion in Reading last month to mark their achievement. At the event, former principle project manager, Roger Remmington said: “I have no doubt that the work we did back then has made the lives of so many people easier. The customers Thames Water serves, of course, but also those who came after us in maintaining the assets. If the Ring Main didn’t exist, I dread to think what the situation would be now in the bid to meet demand.”

In the 25 years since the Ring Main opened, London’s population has continued to grow and Thames Water is already working on additional large infrastructure options to help meet increased demand. These include plans for a new reservoir in Oxfordshire and the potential transfer of water into the Thames Water area from other parts of the country where supplies aren’t so scarce. The company estimates an extra 2.1 million people will move into its region over the next 25 years. Combined with climate change, this will likely result in a shortfall of 350 million litres of water a day between the amount available and the amount needed by 2045 if no action is taken. By 2100, this shortfall is predicted to increase to 650 million litres a day.

Author: Alec Peachey,
Topic: Pipes & Pipelines
Tags: population , Thames Water , water , infrastructure , Water supply


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