Water Table in a Habitat

>Even so, what happens to the water that percolates through the soil?
>
What happens on earth? It goes into a drain which goes down hill and
leads to a river. The river leads to a lake or a sea. Do the same thing
on a habitat and pump the water out of the lake, process/filter it, and
rain it back down again. Is this hard?

>TangoMan
>

-Ian

"If you want to build a ship, don't drum up the workers to gather wood,
divide the work, and give orders. Instead, teach them to yearn for the
vast and endless sea." -Antoine de Saint-Exupery