City still relies on 'magic' method for locating water

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By Elise Von Scheel, CBC News Ottawa, December 2, 2017

When the city gets a complaint about a suspected leaky underground pipe, employees with the environmental services department pack up a van loaded with cutting-edge radar technology and head to the scene.

Every once in a while, however, their high-tech gadgetry lets them down and they resort to a pair of thin metal poles — divining rods.

http://www.cbc.ca/news/canada/ottawa/divining-rod-ottawa-construction-1.4427225