Modern Marvels - Dams

Seizoen: 13 - Aflevering: 9 / 504 - Eerst uitgezonden: 28 maart 2007 - Episode ID: 421868

They block the force of a river, produce enough electricity to power cities, move water over hundreds of miles and irrigate fertile valleys. Dams prevent floods and produce "green" energy. Visit a hydroelectric dam, the most technologically advanced type of dam and a dam in Brazil that is five times the size of the Hoover Dam.