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In page Arno:

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The flow rate of the Arno is irregular. It is sometimes described as having a torrentlike behaviour, because it can easily go from almost dry to near flood in a few days. At the point where the Arno leaves the Apennines, flow measurements can vary between 0.56 and 4,100 cubic metres per second (20 and 144,790 cu ft/s). New dams built upstream of Florence have greatly alleviated the problem in recent years.[citation needed]