As far back as the 3rd century B.C., the value of the abundant water of the River Aniene had already been discerned, and so it began to be exploited, with not just simple infrastructure for water catchment but also levees, dams, basins, deviations, crossings and canals. Through the Aniene Aqueducts, the water was channelled to guarantee aqua publica for the citizens of Rome; from the Middle Ages, the water was used to power mills, paper factories and other industries; and from the mid-19th century it was utilised for the generation of electrical energy.