Describe how California moves water from where it falls to where people need it, using aqueduct systems as a real engineering response to uneven water distribution.
California has a water distribution problem built into its geography: most of the rain and mountain snowmelt falls in the north and in the Sierra Nevada mountains, but many of the largest cities and farming regions are far to the south, in naturally drier areas. To solve this mismatch, California built enormous aqueduct systems, engineered channels, pipes, and pumps that move water hundreds of miles from where it collects to where people need it.
The California Aqueduct and similar systems capture snowmelt and river water, store it in reservoirs, and carry it long distances, often using pumps to lift water over mountains along the way. This engineering makes life possible for millions of people and vast farmland in naturally dry regions, but it also means water use, drought, and snowpack far away directly affect homes and farms that never see that mountain snow fall.
Mastery looks like: They can explain why California needs aqueduct systems and trace how a change in mountain snowpack affects distant water users.
Common stumbles: Thinking water use is only a local, nearby issue; not connecting distant snowpack levels to their own water supply.