The aqueduct is a channel intended to capture and conduct water from one place to another. The Antioch aqueduct supplied the nymphaeum as well as the baths located nearby. It was part of the redevelopments that took place in the 1st century after the foundation of Augustus. Aqueduct bridges, whose arches are still visible, and pipes supplied the city with water. According to various studies, this monument stretched over 11 kilometers long with a drop of 287 m. The channel of the aqueduct, whose width is 0.72 m, captures sources in the mountain of Sultan Dağı and ends in a reservoir which is located near the nymphaeum. Waterproofing is ensured by a masonry of small rough stones bound by a mortar of lime, shale and limestone. To maintain the canal, manholes were fitted in the vault at regular distances. The aqueduct of Pisidian Antioch has three aqueduct bridges of which  the arches are the most spectacular part. These 19 remaining arches, spread over several sections, are 2.10 m wide and 4 to 7.50 m high. Before reaching the city, the water passes through an 800 m long siphon (560 m for the descent and 240 m for the ascent) crossed from a cistern made of rough stones bound by a mortar and a pipe. J. Burdy estimated the flow of water transported to be at 3000 m3 per day. It was undoubtedly the breakdown of the water supply that caused the decline of the city of Antioch and the displacement of the population in the valley towards the current modern city, Yalvaç.