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USGS CMG InfoBank: Flashflooding

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Comment: 10:22 - 11:06 (00:44)
Source: Annenberg/CPB Resources - Earth Revealed - 22. Wind, Dust and Deserts
Keywords: desert, landform, rainfall, precipitation, flashflooding, erosion, transportation, sediment, canyon, deposition, mountain, "alluvial fan", environment

Our transcription: Most of these extreme desert environments contain many unique landforms which despite the infrequency of rainfall are often shaped by running water.
This seeming paradox can be explained by the fact that desert rainstorms, while sporadic, are generally intense, creating flash floods.
These brief, but violent, episodes are highly erosive, quickly transporting enormous quantities of sediment, and over time carving canyons.
These floods also cause sediment to accumulate at the base of mountains in cone-shaped deposits called "alluvial fans."

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