NICOPOLIS AD ISTRUM. CASTELLUM AQUAE (Ivan Tsarov – tsarov@abv.bg) The explorations of castellum aquae continued. It was found that a structure of the reservoir shown on the aquarelle painted by Felix Philipp Kanitz in 1871 is an artistic interpretation. The inscriptions documented on six ashlars of the bottom of the reservoir were conserved. The inscriptions were written with brown paint and probably indicated the position of the relevant ashlar within the structure. A sector of a water-conduit consisting of 24 terracotta pipes was discovered along the northern wall of the reservoir. The pipes were 30 – 35 cm in diameter and 42 – 49 cm long. The water-conduit was constructed in a hurry. The security guard for the aqueduct 22.5 km long was abandoned during the 4th century AD.