<P> A number of other sites fed by several aqueducts have not yet been thoroughly explored or excavated, such as those at Longovicium near Lanchester south of Hadrian's wall, in which the water supplies may have been used to power trip - hammers for forging iron . </P> <P> At Barbegal in Roman Gaul, a reservoir fed an aqueduct that drove a cascaded series of 15 or 16 overshot water mills, grinding flour for the Arles region . Similar arrangements, though on a lesser scale, have been found in Caesarea, Venafrum and Roman - era Athens . Rome's Aqua Traiana drove a flour - mill at the Janiculum, west of the Tiber . A mill in the basement of the Baths of Caracalla was driven by aqueduct overspill; this was but one of many city mills driven by aqueduct water, with or without official permission . A law of the 5th century forbade the illicit use of aqueduct water for milling . </P> <P> During the fall of the Roman Empire, some aqueducts were deliberately cut by enemies but more fell into disuse because of deteriorating Roman infrastructure and lack of maintenance, such as the Eifel aqueduct (pictured right). Observations made by the Spaniard Pedro Tafur, who visited Rome in 1436, reveal misunderstandings of the very nature of the Roman aqueducts: </P> <P> Through the middle of the city runs a river, which the Romans brought there with great labour and set in their midst, and this is the Tiber . They made a new bed for the river, so it is said, of lead, and channels at one and the other end of the city for its entrances and exits, both for watering horses and for other services convenient to the people, and anyone entering it at any other spot would be drowned . </P>

Why did romans used lead pipes for aqueducts and baths