Listening stick is still finding leaks

Scott Walker, leak detective

 A crack team of leak detectives has tracked down and plugged more than 18,000 hidden pipe leaks in the North West over the past 12 months - thanks to a Victorian device that has been used for more than 100 years.

The 140-strong team from United Utilities used wooden 'listening sticks' to save an average of 900 million litres of water - the equivalent of 360 Olympic sized swimming pools.

The long wooden sticks with an ear-trumpet-style end vibrate when a leak is detected, producing a distinctive sound. They have been used since the Victorian era and are still a staple for modern leakage engineers, despite advances in modern technology.

Many of the most wasteful leaks are underground and hidden from view, requiring the team to rely on good hearing, old fashioned know-how and latest digital technology to find them. Leak detectives are most effective late at night, when reduced traffic noise makes it easier to hear the sound of escaping water.

Digital sensors and remotely operated pressure monitoring equipment are also used to turn the tide on hidden leaks.

Hannah Wardle, United Utilities leakage manager said: "We've spotted and stopped thousands of leaks over the past 12 months, using a combination of tried and tested, old fashioned techniques, and cutting edge technology.

"We encourage our customers to save water around the home, as it makes good economic and environmental sense. Our nightly battle against hidden leaks is a way of keeping our own house in order."

Members of the public who spot leaks in the road or footpath can report them to United Utilities by filling in a leak form on the company's website - unitedutilities.com - or by calling 0800 330033.