You’d be surprised. There are cities in the US that have been around for 100+ years that grind to a halt after a large amount of rainfall such as Midland, TX or Clovis, NM where the streets are designed to ferry rainfall to crops or grazing land nearby. They don’t have storm drains, they have streets meant to act as aqueducts because of the lack of normal rainfall. Newer cities built for commerce don’t have that issue and don’t care that half the city would shut down for rainfall that rarely happens.
As for Dubai, they’re getting a higher rainfall than they’ve seen in a while. As a (relatively) brand new city, it makes sense that they didn’t think about it.
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