Because they form and look like Fans
Alluvial fans
Deposition creates landforms such as alluvial fans and deltas.It can also add soil to a river.Hope this helps.
The mineral deposition in this alluvial fan is very unusual for this part of the continent.
It is a fan-or cone-formed store of silt crossed and developed by streams. In the event that a fan is developed by garbage streams it is appropriately called a flotsam and jetsam cone or colluvial fan. The inflexible hand screen fan, was likewise a profoundly enlivening and coveted article among the higher classes
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Alluvial fans
Alluvial fans are triangular deposits of sediment called alluvium. These fans occur when fast-moving water is released from the confines of a river or stream bank and then flows over a wider plain.
erosion
No
The River Severn does not have an alluvial fan. Rivers that empty into estuaries do not have alluvial fans.
Alluvial fans
base of mountains
In Death Valley, CA
A bajada is an alluvial plain formed at the base of a mountain by the coalescing of several alluvial fans.
In Death Valley, CA
herro
A bajada may be created. A bajada is a broad, gently sloping surface formed by the coalescing of alluvial fans.