In 1775 after a drought and following shortage of water in Piran a cistern was constructed on the Old Square (today´s 1st of May Square). Rain water from the encircling buildings was collected in this reservoir. At the north side there are two putti which serve as supports for rain water downpipes. The stairs in the south are flanked by two statues which are allegories for justice and legality. At the southeast corner there is a cast-iron hand pump wth which water could be pumped out of the reservoir.