The Aqua Virgo was completed by Agrippa in 19 BCE and formed part of his systematic overhaul of Rome's water supply. During this period of renovation and new building Agrippa provided Rome with some 700 public water tanks, 500 leaping jets of water and 120 ornamental fountains. The Aqua Virgo itself was the principal source of water for the Campus Martius, bringing in some 100,000 cubic meters of water a day. The aqueduct ran almost entirely underground; it was carved out of solid rock or protected by a concrete ceiling and walls where there was sand or gravel. In places the channel was of a sufficient size to accommodate a raft or an upright person. The water from the Aqua Virgo is still in use and feeds the famous Trevi fountain.
