eservoirs are large structures, which store water for use by cities.

A reservoir next to a water source, like a lake or a river, visibly fills with water so long as it has enough labor. New reservoirs come with a network of underground pipes that bathhouses and fountains both need. By themselves, reservoirs don't slake anyone's thirst; they merely feed water into the pipes that surround them.

When you build a reservoir, you will see its ghostly image attached to your mouse pointer. The image appears full if the site has access to water, or empty if not.

Especially in larger cities, you will often want to provide fountains and bathhouses far from the province's lake or river. To move water far inland, you can build an aqueduct, one of Rome's finest engineering achievements. Aqueducts are tall, open pipes which use gravity to carry water from a reservoir with a water supply to a second reservoir, which has no other souce. You can link several reservoirs together with a chain of aqueducts if you need to. Aqueducts can twist and turn as much as necessary to follow the land's contours and fit your city plan, but they can't cross or intersect with each other. Roads can pass under them. There is no limit to an aqueduct's length.

Reservoirs require labor to operate, though aqueducts do not.

Reservoirs are huge, hulking structures that lower the desirability of surrounding homes. Aqueducts are comparatively graceful, and don't reduce housing's desirability as much. Neither structure needs road access.