Modern Marvels

Dams (14x11)

Ημερομηνία προβολής: Μαρ 28, 2007

Dams - one of man's greatest accomplishments are explored. The history of dams from construction to demolition and their impact on the environment. Beavers and their dams and construction of embankment dams and larger Hydroelectric dams such as Three Gorges, Hoover, and Grand Coulee are explored.