Which outcome occurs when heavy rainfall saturates poorly compacted fill within a pre-Columbian agricultural terrace system?

💡 Explanation

When rainfall saturates uncompacted fill, increased hydrostatic pressure from water weight causes soil deformation leading to slope instability, triggering terrace wall bulging and collapse. Therefore, structural failure occurs, rather than improved yield, root growth, or drainage control which require stable, well-engineered backfill.

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