Only a few years ago more than half of the 10,000 miles (16,000km) of water pipes below the streets of London were over a hundred years old and often burst.
Meanwhile, more than half a million pipes burst every year, according to the American Water Works Association, and more than 6 billion gallons of water are lost to leaky pipes.
同时,据美国水工程协会(American Water Works Association)报告,每年有超过五十万根管道发生爆裂,并且由此导致的泄漏有60多亿加仑。
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Delhi loses about half the water it gets to leakage, from both decaying pipes and theft, and what's left isn't evenly distributed.