"Around the turn of the second century A.D., the emperor Trajan began construction on a new aqueduct for the city of Rome. At the time, demands on the city's water supply were enormous. Upon its completion, the Aqua Traiana was one of the 11 aqueducts that, by the end of the emperor's reign, carried hundreds of millions of gallons of water a day."
By Rabun Taylor, Archaeologist