The 1910 Great Flood of Paris (French: Crue de la Seine de 1910) was a catastrophe in which the Seine River, carrying winter rains from its tributaries, flooded the Paris conurbation, France. The Seine water level rose eight metres above the ordinary level.
In late January 1910, following months of high rainfall, the Seine River flooded Paris when water pushed upwards from overflowing sewers and subway tunnels, and seeped into basements through fully saturated soil. The waters did not overflow the river's banks within the city, but flooded Paris through tunnels, sewers, and drains. In neighbouring towns both east and west of the capital, the river rose above its banks and flooded the surrounding terrain directly.
Winter floods were a normal occurrence in Paris but, on 21 January, the river began to rise more rapidly than normal. Over the course of the following week, thousands of Parisians evacuated their homes as water infiltrated buildings and streets throughout the city, shutting down much of Paris' basic infrastructure. Police, fire-fighters, and soldiers moved through waterlogged streets in boats to rescue stranded residents from second-story windows and to distribute aid. Refugees gathered in makeshift shelters in churches, schools, and government buildings. Although the water threatened to overflow the tops of the quay walls that line the river, workmen were able to keep the Seine back with hastily built levees.
Once water invaded the Gare d'Orsay rail terminal, its tracks soon sat under more than a metre of water. To continue moving throughout the city, residents travelled by boat or across a series of wooden walkways built by government engineers and by Parisians themselves.
On 28 January the water reached its maximum height at 8.62 metres (28.28 feet) above its normal level.
Estimates of the flood damage reached some 400 million francs, or $1.5 billion in today's money. The flooding lasted nearly a week, according to one report.
Because of the water rising over time there were no deaths. The water achieved its highest level after 10 days and after 35 days the water was gone completely.