Which long-term outcome faced Roman aqueducts supplying water to urban centers with high usage rates and water hardness?

💡 Explanation

When aqueducts carried hard water long distances, calcium carbonate precipitation occurred due to changes in pressure, temperature, and CO2 outgassing, leading to scale buildup that reduced flow. Therefore flow reduction results, rather than structural collapse, biofilm, or erosion which require different geological or biological processes.

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