How do desert flash floods happen so quickly?
Quick Answer
Dry ground often cannot absorb intense rain, so water rushes across the surface and into washes and wadis. Even a storm far away can send a dangerous flood through a desert valley.
The Full Story
Flash floods are one of the most dangerous desert hazards because rainfall is often brief, intense, and far upstream. When dry soil becomes crusted or already saturated, water runs off instead of soaking in, racing through channels called wadis or arroyos. The flood can arrive with little warning, carrying rocks, debris, and mud. In dry climates, the landscape offers few barriers to stop the flow, so water can rise very rapidly. Desert communities in places such as Arizona and the Middle East often prepare for these sudden events.
Key Facts
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