11.25.2008

Alluvial Fans no Laughing Matter
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"Show me someone who likes stream deposits and I'll show you an alluvial fan," say geologists.

Millions of people worldwide have settled on alluvial fans, not always a good idea. Alluvial fans (USGS, 1999) form at the base of mountains where fast-flowing streams meet relatively-flat surfaces of basin floors or broad valleys.

Alluvial fans in Death Valley
The Sangre de Cristo range, Colorado
The San Francisquito Creek watershed, Bay Area
In Pakistan...

Fast flowing Debris flows can occur in alluvial fan areas.


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