Dam Security NPR's Howard Berkes reports that managers at America's dams and reservoirs are beefing up security to prepare for possible biological and chemical attacks. Sixty-one million people depend on dams and reservoirs for their water -- making the structures a tempting target.
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Dam Security

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Dam Security

Dam Security

Dam Security

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NPR's Howard Berkes reports that managers at America's dams and reservoirs are beefing up security to prepare for possible biological and chemical attacks. Sixty-one million people depend on dams and reservoirs for their water — making the structures a tempting target.