November 20, 2012

Preventing Subway Floods with Giant Balloons

Henry Fountain, New York Times

AP Photo

With a few dull thuds, the one-ton bag of high-strength fabric tumbled from the wall of the mock subway tunnel and onto the floor. Then it began to grow.

As air flowed into it through a hose, the bundle inflated until it was crammed tight inside the 16-foot-diameter tunnel, looking like the filling in a giant concrete-and-steel cannoli.

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TAGGED: Balloon, Flood