Aquaduct

Aqueduct
An Aqueduct brings water from alpine lakes and rivers to lowland cities where water is scarce or insufficient for the local populace. A finished series of Aqueduct hexes must connect to a hill or mountain hex (with a river or lake) on one end and a settlement on the other end; otherwise, you do not gain its benefit.
Terrain: One end must be hill or mountain hex; can pass through any type of hex.
Effect: Loyalty+1, Stability +1, allows settlement to build water-dependent buildings.
Cost: As a Road, except the cost is not doubled for hexes with rivers