Branch of the aqua Marcia in Rome behind the horti Pallantiani (Frontin. Aq. 19,8) south of the porta Tiburtina, which supplied the regiones I, XI and XII via the Caelius mons and the Porta Capena. The association of a Herculaneus rivus (HR) with the aqua Virgo in Plin. HN 31,42 is probably due to a mistake. Another HR was the permanent spring that supplied the Anio novus 38 miles east of Rome at the via Sublacensis (Frontin. Aq. 15,4f.).
D. Cattolini, s.v. H.r., LTUR 1, 1993, 69.