Riverbed construction poses risks for bridges, experts say

11/23/2009 | BBC

Bridges built on gravel riverbeds are at risk of floodwaters removing the riverbed downstream from the bridge piers, experts say. They note that some older bridges are built on piers dug into the riverbeds at a shallow level. When water levels reach the deck of a bridge, more force is applied and a dam is created. One solution is to place a protective layer on the riverbed to keep it stationary, experts say.

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