I found two articles, both said the cause of the break is
unknown. What is your source of information?

--
Christopher A. Young
Learn more about Jesus
www.lds.org
..


"mm" wrote in message
...
Don't do something right and 44 years later, it will bite
you.

A 66" water main that broke in December and sent a river of
water down
River Road in Bethesda Maryland, washing cars down the road
in two to
three feet of rushing water, ruptured because it was
installed against
jagged rock 44 years ago, instead of on a layer of gravel,
as it
should have been, according to a consultant's analysis
released on May
20.

A four-foot tear was found in the part of the pipe that had
been laid
against the rock.

The Washington Suburban Sanitary Commission has 5500 miles
of water
pipes and serves 1.8 million people in Montgomery and Prince
George's
Counties.

Paraphrased from the Washington Post, May 21, page B1.