Which problem primarily limited the height and spanned distance of Roman aqueducts?

💡 Explanation

When constructing Roman aqueducts, concrete tensile strength restricted the height and span because taller and longer structures experience greater bending stress that can cause cracking if the tensile limit is exceeded. Therefore, the material's tensile limitation mattered most, requiring multiple arches and a shallow and long decline rather than mineral deposits, thermal stress, or leveling inaccuracies.

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