like in a landslide, or can be carried by an intermittent stream or creek.

The reduction of flow is key to the formation of alluvial fans. If a river exits a mountain valley without any reduction in flow, it is more common to see the formation of an alluvial plain. The steepness of an alluvial formation depends on how much flow decreases when entering flat ground as sediment will be deposited further away from its source if river flow is high.

Alluvial

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