Thunderstorms: where does the water pouring into metro stations go?

Published by Nathanaël de Sortiraparis · Photos by Cécile de Sortiraparis · Published on August 19th, 2022 at 03:58 p.m.
Numerous videos showing the flooding of metro stations were posted on social networks during the heavy storms of August 16, 2022. But do you know how this water is evacuated?

The power of thunderstorms can be impressive, as we saw on August 16, 2022 when torrential rains hit the city of Paris. In the metro stations, it was downright flooding. Numerous videos circulated on social networks, notably Twitter, showing hundreds of liters of water pouring into several stations.

Yet they were quickly evacuated, despite the fact that the stations were already deep underground. How does the RATP evacuation system work?

When strong flows of water pour into the station corridors, ubiquitous gutters channel them to the lowest points of the station, where pits are located. These are equipped with high-powered pumps. They empty the pits and discharge the water directly into the Seine or the sewers. The pumps are designed to evacuate several hundred liters of water in just a few minutes. So it's unlikely that the metro will overflow with rainwater!

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