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In drought, a city's über-plumbers plug leaks

By Ron SchererStaff writer of The Christian Science Monitor / April 30, 2002


Meet George Kunkel Jr., Philadelphia's king of leaky pipes.

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We're not talking daily drips here, or even the toilet that won't stop running. Mr. Kunkel is after the real thing: Rosie the Riveter-era water mains that have finally cracked under the pressure of time.

During this drought, Kunkel's mission has taken him to one of the city's seedier neighborhoods. Just outside Bo's Tire Repair, Kunkel has donned a set of headphones that seem to be coming out of a hydrant. He is hearing what sounds like a bathtub draining, but is actually water being forced out of a broken pipe. "It's a leak all right," he says.

Unfortunately, this is just one missing drop in the bucket. The City of Brotherly Love, with possibly the oldest water system in the nation, cannot account for about 85 million gallons of water a day, or about 30 percent of what the city sucks up from the Delaware and Schuylkill Rivers. In fact, almost every major city in the East is faced with this problem: US water systems lose about 15 percent of the 40 billion gallons of water per day that flow through the municipal pipelines, estimates the United States Geological Survey.

"Leakage is one of the major problems for the US water supply," says Earl Spangenberg, a professor at the University of Wisconsin at Stevens Point and an authority on water issues. "Almost every metro area has this kind of problem. What determines the extent of the problem is the age of the distribution network and the fact that cracks and leaks happen in any system."

In the past, many municipal water systems didn't worry about leaks. They reasoned that it was more expensive to send a crew out to find cracks and pinholes than to lose some water. "When it rains, they quit worrying about it," says Tim Brown, a consultant at Heath Consultants in Houston. "For some it's only during a drought that they look for leaks: We call it the 'hydro-illogic' cycle."

Mr. Brown says municipal water systems should check their math. He estimates that it costs about $150 per mile of main to find a leak. If a system is losing 20 percent of its water, it may be costing as much as $100,000 per year in water that could be sold.

When a water company does find leaks, Brown says, more than half the time the leak is on the service line leading from the main to the residential user. In some water systems, repair of that leak is up to the homeowner. In fact, in Philadelphia, homeowners are given 10 days to stop such a leak, or their water service may eventually be shut off. Repairing the line can cost thousands of dollars.

"We often get a call from the resident who says, 'There must be some mistake here,' " Kunkel says. "They are truly shocked when they find out there is no mistake."

Kunkel says that water suppliers are now starting to question if they should spend more money maintaining those service lines since they represent about 55 to 60 percent of the leaks. This may entail offering insurance to homeowners. "We are looking into channeling our funds more strategically," he says.

Fighting the deluges

Although these leaks are important, Kunkel is also trying to stop much larger deluges – with some success. Ten years ago, the city could not account for 130 million gallons of water per day, or almost 50 percent of what it used. "We're making headway," says Kunkel, whose official title is "chief, load control center."

Kunkel, a trim man, looks more like an accountant than a plumber. But trained as an engineer, the sandy-haired manager is adept at using everything from giant clamps, which act as Band-Aids on pipes, to the most sophisticated electronic equipment – like hydrophones – which can locate a water leak under the street.

To find the leaks, Kunkel studies water patterns the same way that Wall Street analysts study stock charts. Normally, residents start their day with a shower, which together causes a sharp spike in water demand. By 7 a.m., however, use drops until 8 p.m., when dishwashers push it back up again. In the early-morning hours, demand is a trickle.