what brought large amounts of water into the city of rome
Roman aqueduct Aqueducts moved water through gravity alone, usually along a slight overall downward gradient within conduits of stone, brick, or concrete, but sometimes through steeper gradients. Most conduits were buried beneath the ground and followed the contours of the terrain; obstructing peaks were circumvented or, less often, tunneled through. Where valleys or lowlands intervened, the conduit was carried on bridgework, or its contents fed into high-pressure lead, ceramic, or stone pipes and siphoned across. Most aqueduct systems included sedimentation tanks, which helped reduce any water-borne debris. Sluices and castella aquae (distribution tanks) regulated the supply to individual destinations. The run-off water from aqueducts sometimes drove urban water-mills, and scoured the drains and sewers.