Aqua Appia

Channel of the Appia

Fabretti's drawing of the Aqua Appia channel: cross section of underground conduit.
ABCD. Size and shape of the gallery excavated for building the aqueduct in it, within the rock itself.
The height from C to A is five and a half feet. The breadth form C to D is equal to the height. (..)
EFGH. Walls of Alban stones, by which the conduit was narrowed. The breath form E to F is one
foot four inches. The breath from G to H is two feet ten inches.