Environmental Enlightenment #313
If you dip into environmental reports, you will likely run into the term basin.
The essential concept of basin is water container (derives from Latin bacinus, bacca)
A basin is a tract of country drained by a river and its tributaries, or which drains into a lake or sea.
Here are the Greater Los Angeles basins:
A Groundwater Basin is a flow system that has defined boundaries and may include more than one aquifer. The basin includes both the surface area and the permeable materials beneath it.