A subway flood expert explains what needs to be done to stop underground station deluges
- Written by Klaus Hans Jacob, Professor of Geophysics, Columbia University

Subway stations in New York were inundated with water following heavy rain on Sept. 1, 2021. But the Big Apple isn’t alone – over the last year we have seen similar images in other major cities, including London and Zhengzhou in China.
We spoke with Klaus Hans...
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