Which maintenance risk increased during wet weather on Roman paved roads involving the 'agger' embankment?

💡 Explanation

When rainwater saturates the soil base of the agger, hydrostatic pressure increases because water fills pore spaces, reducing soil shear strength and leading to embankment deformation. Therefore, embankment deformation risk increases under wet conditions, rather than thermal cracking, abrasion, or corrosion which require distinct mechanisms.

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