Manchester Water Works Sinkhole trapped car on exposed gas line after 110-year-old water main burst. Vehicle and driver were rescued. The town of Manchester, N.H., has been replacing about two miles of aging water pipeline annually in recent years, but municpal crews could not complete their task before a 12-in.-dia water main dating back to 1901 burst. The rupture on Dec. 13 created a street sinkhole that was perilous for one driver.“A cap blew off the back of a cross on the water main,” before water gushed up on the left side of the subcompact, trapping it on a live
Arch dams, classically curved monoliths situated in narrow valleys, are not as common as other types of dams, such as embankment dams and gravity dams. ENR takes a look at some of the biggest arch dams in the world, both completed and under construction.