Technology
The ancient Romans also had a complex system of aqueducts, which were used to transport water across long distances. The first Roman aqueduct was built in 312 BCE. The eleventh and final ancient Roman aqueduct was built in 226 CE. Put together, the Roman aqueducts extended over 450 kilometers, but less than seventy kilometers of this was above ground and supported by arches.
Amoreira Aqueduct
The first municipal azulejos were erected in 1864, and were later supported with alternates dating to 1873. In 1870, the aldermen requested that the Cortes provide funding to repair and clean the structure, as well as construct a supplementary canal to facilitate future cleaning. During these motions, it was indicated that calcium buildup in the pipes should be removed every ten years, to remedy these problems.