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How much of it was lined with lead vs terra cotta. Most traversal was on aqueducts which I don’t think typically were lined with lead, but I’d love to be corrected on that.

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Aqueducts are specific structures to span valleys when needed and certainly were not the primary structure to deliver water.

Aqueducts are the whole long structure bringing water to a settlement, including bridges, tunnels and channels along the ground.

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