Alluvial Fans

Flooding occurring on the surface of an alluvial fan or similar landform which originates at the apex and is characterized by high-velocity flows; active processes of erosion, sediment transport, and deposition; and unpredictable flowpaths.

The image is a photograph of an alluvial fan formation along the side of the mountain range. The slope is crisscrossed by dry drainage channels that take irregular paths down to the base of the hill.