Roman aqueduct system (North and South and Humber Hill Feeder) largely destroyed by ploughing and opencast mining. Slight traces remain. A northern channel ran from a low earth dam and may have run around the north side of Humber Hill, with the northern route being the feeder channel. Existence of a 'higher dam' feeding the lower dam has also been identified. The southern channel appears to have been fed by a spring. Both channels are thought to have converged and a single channel fed into a reservoir to the south-west of the fort. Several excavated sections. Scheduled monument.