Which risk increased when ancient Roman aqueducts' limestone channels interacted with slightly acidic water for prolonged periods?

💡 Explanation

When slightly acidic water flowed through limestone channels, dissolution occurred because the carbonic acid in the water reacted with the channel's calcium carbonate, depositing a layer of calcium build up inside the channel. Therefore reduced flow results, rather than structural collapse, increased algae, or settling which require different deteriorating mechanisms.

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