Which structural risk increased when Medieval Scottish masons narrowed aqueduct channels beyond Roman design?

💡 Explanation

When Medieval Scottish masons narrowed aqueduct channels, the surface area to volume ratio increased because the colder climate caused more frost penetration in the smaller, constrained spaces, thus producing more expansive stress inside materials. Therefore, frost cracking increased, rather than sediment buildup, pressure surges or root penetration which require separate catalysts.

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