Aqueducts moved water through gravity alone, being constructed along a
slight downward gradient within conduits of stone, brick or concrete.
Most were buried beneath the ground, and followed its contours;
obstructing peaks were circumvented or, less often, tunnelled 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,
sluices and distribution tanks to regulate the supply at need.
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