Why do some deserts have flash floods instead of steady rivers?
Quick Answer
Deserts often get rain in short, intense bursts, and dry ground cannot absorb it fast enough. Water then rushes across the surface as flash floods rather than flowing in stable rivers.
The Full Story
Steady rivers need frequent input and a drainage system that can carry water year-round. In deserts, rainfall is irregular and often arrives as sudden storms, sometimes from distant thunderstorms. Because the soil is hard, crusted, or already dry, much of that water runs off at once. The result is a powerful but short-lived flood that can sweep through dry channels and wadis. These floods may shape the landscape more than the rare quiet trickle of water does.
Key Facts
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"Why can a desert river appear only when it’s flooding?"
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