Scientists have found evidence of the most powerful storm in history, which hit Earth in 14,300 years ago. It would cause mayhem in today's technology-dependent world.

Learn and revise about rivers and why they flood. Examine hydrographs and case studies of recent world flooding disasters with BBC Bitesize KS3 Geography.

Hydrographs of drainage basins Hydrographs A hydrograph shows two graphs – a bar chart showing rainfall and a line graph showing discharge from before, during, and after the rain storm.