The 12th century aqueduct that carried water from the nearby town of Alcalá de Guadaira to the city is known as Caños de Carmona. The name 'de Carmona' comes from the fact that the aqueduct reached the city next to the Puerta de Carmona. From there, some clay pipes that ran inside the walls carried the water to the Alcázar.
It seems that the pipes were built reusing the layout of an ancient Roman aqueduct, in the Almohad period, during the reign of Yusuf. Originally they were about 17 kilometers long and would have around 400 arches, raised on robust brick pillars. Depending on the unevenness of the terrain, in some areas a simple arcade was arranged and in others a double one was necessary. Currently, only a few scattered fragments remain along the axis of Luis Montoto street. The remains are frequently misidentified with a Roman aqueduct.