Cilecchio, along with the Serenity, was one of the two natural emissaries of Lake Bientina in the '500. It came from the swampy area of the lake and flowed into the municipal territory of Bientina, joining the lake with the river Arno. Before the Arno grinding, carried out by the Medici from 1560, this confluence took place near Bientina. Subsequently, the watercourse underwent a modification to connect it to the new path that the river had assumed, much more southern than the previous natural riverbed, so that Cilecchio was lengthened considerably. By the middle of the 18th century, the remaining part of the riverbed that was still interested in Bientina was removed from the village for the construction of the Great Square of the town: the sinuous movement of one side of the square is still the original path of the river.
Having become a collector of various drains and mounds of the reclaimed plain, it was equipped in the eighteenth century of roofs still visible (albeit partially hidden and modified by an electric cabin of the 1920s) at the beginning of Viale Armando Diaz a Vicopisano.
New 18th-century hydraulic constructions, originally located directly on the Arno and a bunker built by the Germans in 1944, have recently been rediscovered near these roofs.
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