We don’t always! Obviously there are parts of the world with enough rainfall to support non-irrigated farming and locals can use tanks for household water. There are those near rivers and then there are those that can use groundwater.
This question was recently posed to me, why bother with all of this infrastructure if we can just move to where the water is? It makes sense at first, we shouldn’t live in dry areas. We shouldn’t farm in dry areas.
While we shouldn’t go to the other extreme of trying to live in a desert, it’s well worth noting the reasons why we don’t just move to where the water is.
- Frequently the wet areas are too hilly for cities and civilisation.
- Many crops prefer to grow in dry climates, but still need water.
There are other reasons, but these are the two main ones.