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The water system that serves the U.S. capital city of Washington, D.C. dates back to the nation's Civil War. Just think - in the time of Lincoln people dug into the ground with hand-made shovels to lay a water system.
Today, that 19th Century water system for the District of Columbia is now arguably one of the smartest in the world.
Why? Those water pipes are now fitted with sensors that analyze data on valves, storm drains, service vehicles and truck routes.