Note 68 — Chapter IV · PART I. THE AQUEDUCTS.
Reading edition
Frontinus, lib. i. c. 7.
Frontinus states in another chapter (c. 12) that Augustus brought underground another stream, which should be supplementary to the Marcian whenever the dryness of the season rendered extra supply necessary. It was called from the name of the contriver, Augusta, and had its rise above the spring of the Marcian. This additional ductus, or Specus Augusta, was 800 paces long.