Which risk increases when a section of a Roman aqueduct experiences significant ground subsidence?

💡 Explanation

When ground subsidence occurs, tensile stress concentration is induced because settlement creates uneven loading, increasing stress beyond the material's tensile strength at specific points, leading to cracking/failure. Therefore, structural failure results, rather than sedimentation, biofouling, or oxygen depletion which involve fluid properties, biological activity, or water flow.

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