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Great site that compares some of the world's biggest dams and gives great information on them. It also describes the forces involved with dams and covers some of the basic designs.

A kid interviews an engineer at the Hoover Dam. Accessible for kids.

Someone reads a legend about why beavers make dams over some images.

Great 45 min video about beaver dams.

Animation showing how Niagara Falls generates electricity complemented by live footage inside the dam.

Great animation of how dams are structured to produce electricity