In order to create an Aqueduct, one must first discover the Engineering technology. In addition, an Aqueduct's base cost is 50 Production.
If the city already has fresh water, an Aqueduct instead provides +2 Housing. If a city does not have access to fresh water, then an Aqueduct provides +6 Housing to the parent city. the City Center is adjacent to a river, lake, or oasis). The Aqueduct has differing effects that depend on whether or not a city already has a source of Fresh water (i.e. The Aqueduct is a unique early-game district designed to provide Housing in the form of fresh water to a city.
