Which outcome occurs when prolonged saturation weakens the foundation beneath a riverside levee?

💡 Explanation

When prolonged saturation weakens a levee's foundation, soil loses cohesive strength because pore water pressure increases, destabilizing the structure and causing subsidence, possibly leading river avulsion by diverting to areas with topographic gradients. Therefore, subsidence accelerating river avulsion results, unlike hardening or stabilization, requiring vastly different geological processes.

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