Which situation rapidly destabilizes a river levee system during prolonged period of heavy rainfall events?

💡 Explanation

When heavy rainfall saturates a levee, increased pore water pressure initiates seepage erosion because water flows through the levee material, weakening the structure by removing small soil particles at the levee's base. Therefore, seepage erosion leading to undermining results, rather than removing vegetation, avulsion or sediment depriving impacts that involves different processes.

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