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Buy the "Great Projects" videos and companion book at ShopPBS. |
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An Unsustainable Strategy? But the levees were built on a paradox. The higher they rose, and the more continuous their line on both sides of the river, the more protection they afforded—as long as they did not break. If they broke, their great height actually increased the risk that the ensuing floods would drown and destroy. |
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  How engineers contained and controlled the Colorado and Mississippi rivers. Thomas Edison lights up New York City; Sam Insull brings power to Chicago; and TVA electrifies rural America Constructing the George Washington Bridge Putting a major highway under Boston  |
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