Which outcome arises when an extreme flood event exceeds natural levee height along a major river?

💡 Explanation

When floodwaters overtop the natural levees, avulsion occurs because the high hydraulic gradient carves a new, more direct channel across the floodplain, abandoning the original channel. Therefore, stream rerouting via breach results, rather than enhanced sinuosity, sediment deposition, or soil stabilization which would require different fluvial conditions.

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