1920s: The Great Mississippi flood, USA

 

© Steve Nicklas, NOS, NGS/Wikimedia Commons/CC0

The most devastating river flood in US history took place in April 1927, after months of extreme rainfall swelled the Mississippi Delta and collapsed the entire levee system along the river. The flooding inundated nearly 26,000 square miles (67,339sq km) of land in 170 counties, across seven states. The catastrophe, which hit Arkansas, Mississippi and Louisiana the worst, drove around 931,159 people from their homes and it is thought that between 250 and 1,000 people died. 

Historic weather events that shocked the world (msn.com)

1920s: The Great Mississippi flood, USA The most devastating river flood in US history took place in April 1927, after months of extreme rainfall swelled the Mississippi Delta and collapsed the entire levee system along the river. The flooding inundated nearly 26,000 square miles (67,339sq km) of land in 170 counties, across seven states. The catastrophe, which hit Arkansas, Mississippi and Louisiana the worst, drove around 931,159 people from their homes and it is thought that between 250 and 1,000 people died.