Which risk increases when prolonged heavy rainfall saturates materials of completed coastal levees?

💡 Explanation

When levees are saturated, pore water pressure increases because frictional contacts between soil grains decrease, making the structure susceptible to liquefaction under seismic loads, allowing for lateral displacement. Therefore, liquefaction-induced spreading results, rather than bioerosion, reduced thermal stress, or overburdened instability, which require different mechanisms.

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