Aqueducts are built in areas where you have a bunch of motivated end users (LIKE a town or group of farmers) at a low elevation in need of a more reliable source of water located somewhere fairly nearby at a higher elevation. The aqueduct builders construct a series of canals, elevated channels, and tunnels as required to get the water from the source to the end users. Some good examples:

•  Roman engineers built aqueducts throughout Italy and France from mountain water sources to serve city dwellers
•  Water-needy Southern California CITIES and farms are served by an aqueduct that brings them water from sources in Northern California
•  New York City is supplied by an aqueduct and tunnel system from sources upstate.
• INCA farmers in COASTAL valleys built irrigation aqueducts from sources higher up in the Rockies
•  Native American cultures in PHOENIX area built irrigation canal systems that diverted water from sources at higher elevations to irrigate their crops.

Aqueducts are built in areas where you have a bunch of motivated end users (like a town or group of farmers) at a low elevation in need of a more reliable source of water located somewhere fairly nearby at a higher elevation. The aqueduct builders construct a series of canals, elevated channels, and tunnels as required to get the water from the source to the end users. Some good examples: