Which consequence results when sediment-laden flow exits a constricted canyon onto an unconfined valley floor, exceeding the transport capacity?

💡 Explanation

Alluvial fan deposition occurs because the decrease in flow velocity causes sediment sorting and deposition by the mechanism of settling. Therefore, a fan forms, rather than flash floods that would maintain velocity or channel changes which change direction.

• Which mechanism causes an avulsion event when a river's levee system is overwhelmed by sediment deposition?
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