China's super-dam is a disaster waiting to happen / China's new super-dam carries both geopolitical and environmental risks / BHP Billiton discussed 'outrage factor' of dam failure years before disaster / Fears of further destruction in Spain's Valencia as major dam at risk of breaking / Torrential rains flood North Carolina mountains and create risk of dam failure / Residents of Illinois town evacuate as officials warn of 'imminent' dam failure / Video shows Minnesota dam on verge of failure as residents remain on high alert / Floods break through US dam causing major damage / Minnesota officials warn residents that dam is facing 'imminent failure' / Deadly dam failures: Cause, effect and prevention