Following a two-year pilot project, the City of Hamilton launched a program to proactively detect water leaks in underground pipes in early 2021. That year, the program helped to locate a total of 109 leaky underground pipes, saving the city an estimated $537,068.
In 2021, the city treated and distributed nearly 75 million cubic metres of drinking water to homes across Hamilton. While that water is intended to come out of the taps in residents’ homes, sometimes it gets lost along the way. Lost water can occur for several reasons, including leaky or broken pipes, firefighting, watermain flushing and more.
All together, Hamilton’s water system includes six water distribution systems, 2,031 km of watermains, 13,568 hydrants, 23,305 valves and 153,647 service connections.
According to the city, a significant contributor to lost water is leaking and broken watermains. On average, the city experiences about 300 watermain breaks each year. Due to Hamilton’s unique geography and often rocky porous ground, there are many watermain leaks and breaks that do not surface and have the potential to remain undetected for years. These hidden leaks account for a large amount of lost water. They can also cause serious damage to the pipe network, create erosion which results in pipes breaking, and even cause damage to foundations or roads, bridges and buildings.
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Lost water, also called non-revenue water (NRW), creates financial consequences for the city, including unbilled water consumption and unnecessary operational costs to produce and distribute drinking water (treatment chemicals, energy, etc.).
In 2019 and 2020, the city began a pilot project for proactive detection of water leaks. According to the City of Hamilton, it used leading-edge leak detection technology to focus on about 400 km of watermain and was able to verify 177 leaks (24 of these leaks were located on private water service lines).
The city said that based on the success of the pilot project, it launched a formal leak detection program in early 2021, with a goal of assessing the entire water system by the end of the year. To detect the leaks, the city attached magnetic listening devices to fire hydrants and isolation valves to listen for leaks that could be within 100 metres. The listening took place between 2 a.m. and 4 a.m. when water usage and traffic noise are typically less, meaning reduced interference and more accurate readings. After locating a potential leak with the listening device, crews would head into the field to pinpoint the exact leak location.
The city said that at the end of 2021, proactive leak detection technology was deployed to more than 5,990 locations and had identified an additional 109 leaks (17 of these leaks were located on private water service lines).
Moving forward, the projected annual cost of the proactive leak detection program is approximately $165,000, based on staffing costs, according to the city.
To read the original news release from the City of Hamilton, click here.