Which risk increases when rapidly rising floodwater overtops a natural levee along a major river?

💡 Explanation

When floodwater rapidly overtops a natural levee, pore water within the levee soil increases because the soil becomes waterlogged, leading to a decrease in soil shear strength and initiating slope failures. Therefore mass wasting slope failures result, rather than ozone depletion, weathering, or ocean circulation changes unrelated to levee mechanics.

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