The yellow fever epidemic of 1867 caused a huge sanity problem that led the local authorities the need of constructing a structure for wastewater treatment. Therefore, the government committed Irish engineer John Coghlan the project of sanitation of Buenos Aires through the construction of a sewage system. The system run from Recoleta district and consisted of two iron tubes that dig 600 meters deep in Río de la Plata to carry out the water to the sanitation plants. After being purified, the water was sent to city to be distributed.