 The Cutzamala System built in stages from the late 1970s to the late 1990s to transfer 14.9 m3/s (19% of total supply) of water from the Cutzamala River in the Balsas basin in the Southwest to Greater Mexico City for use as drinking water, lifting it over more than 1000 meters.It utilizes 7 reservoirs, a 127-km long aqueduct with 21 km of tunnels, 7.5 km open canal, and a water treatment plant.Its cost was US$1.3 billion.