
Thiles Targon |
You must build them from a hill or mountain to a settlement. Effect +1 Loyalty and +1 Stability.
If the aqueduct is 3 hexes long do I get +3 loyalty and +3 Stability or +1 Loyalty and +1 Stability, i.e. is the bonus per hex like the other terrain improvements, or per settlement like a building?
Can I a run a second Aqueduct from the same mountain to another city along the same path, and if I do, do I pay the cost again for the shared part of the route?

Chemlak |

Barring developer confirmation to the contrary, terrain improvements provide their bonuses per hex.
So a 3 hex aqueduct will provide +3 loyalty and +3 stability.
For your second question: no. You would only pay the cost for new hexes that have an aqueduct added.
If you're concerned about this, consider the following: a 3 hex aqueduct is about 36 miles long. That is a very significant investment, hence the larger benefits. Also, due to the abstraction of the kingdom rules (take roads for example: it's not a single road, it's many roads throughout the hex, in all directions), an aqueduct is delivering water to every hex it passes through, so creating a branching one is completely reasonable.