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Geography

How Urbanization Alters Local Hydrological Cycles and Flash Flood Risks

Quick fact

In a natural landscape, about 50% of rainwater infiltrates the ground, but in a city with high impervious cover, that number drops to just 15%. This means more water floods streets and overwhelms drains, turning a normal storm into a flash flood.

Why this is interesting

Ever notice how city streets turn into rivers after a heavy rain?