Which process primarily causes levee failure during prolonged heavy rainfall events?

💡 Explanation

When rainfall saturates a levee, the increased pore water pressure reduces the soil's shear strength, leading to slope instability and potential collapse because of reduced friction between soil particles. Therefore, saturation leading to slope instability results, rather than compaction, erosion, or liquefaction, which require different triggers.

• Which mechanism amplifies stream erosion when deforestation occurs on steep slopes within equatorial rainforests?
• Which mechanism causes uplift along a thrust fault during compressional stress?
• Following months of increased stress, which outcome primarily results during stick-slip behavior along fault lines?
• Which outcome is accelerated during subduction with serpentinization?
• Which increased risk emerges when thawing permafrost destabilizes earthen dam infrastructure?
• Which outcome is caused by creep along a major fault?