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| Add a caption - Roman architects were skilled in this kind of leveling work, for which they used sophisticated tools. Besides the ordinary level (Libella), similar to the one used today by carpenters, they used devices such as a groma, chorobates, and dioptra.
Given the elementary means, materials, and tools which were available, it is remarkable to see the precision with which the Roman aqueducts were laid out. The mean gradient of a Roman aqueduct was something between 0,15 - 0,30 %.
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