Why do some arid regions get rare but intense flash floods?
Quick Answer
Dry soils often repel water or absorb it slowly, so heavy rain runs off quickly instead of soaking in. Steep terrain and sparse vegetation make floodwater surge through dry channels very fast.
The Full Story
In deserts and semi-arid areas, the ground may be crusted, compacted, or so dry that it cannot absorb rainfall quickly. When thunderstorms dump a lot of rain in a short time, the water flows overland into dry streambeds and can build into sudden floods. Because vegetation is sparse and channels may be steep or narrow, the water gains speed and destructive force. Flash floods are a major hazard in dry climates because the danger can appear far downstream from where the storm actually formed.
Key Facts
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"How can a desert river appear in minutes and vanish just as fast?"
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