Which risk increases when an alluvial channel experiences increased sediment load during flash flooding?

💡 Explanation

When sediment load increases in an alluvial channel, aggradation occurs because deposition exceeds erosion, leading to channel avulsion where the river jumps its banks and establishes a new course. Therefore aggradation and channel avulsion are more likely, rather than fertility decrease, reduced infiltration, or increased vegetation which require different environmental changes.

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