Which risk significantly increased if Mesopotamian terraces, part of an early irrigation system, exceeded carefully stepped construction limits during use?

💡 Explanation

Structural collapse becomes likely because soil saturation generates hydrostatic pressure exceeding the retaining capacity of the terrace walls; this is a Geostatic Stress failure. Therefore, the answer is collapse, because, rather than erosion; erosion would come from consistent water flow, not exceeding terracing limits.

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