times, most recently in 1966, with 4500 m3/s after rainfall of 437.2 mm in Badia Agnano and 190 mm in Florence, in only 24 hours.

Before Pisa, the Arno is crossed by the Imperial Canal at La Botte. This water channel passes under the Arno through a tunnel, and serves to drain the former area of the Lago di Bientina, which was once the largest lake in Tuscany before its reclamation.

The flow rate of the Arno

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