and sometimes, the water table is above the natural ground level-- and you get a wetland..

see what the EPA has to say about them..

i'll continue to look, because there also a page on the path of surface water to the water table..(and wet lands are a sometimes intermediary stop)
http://www.epa.gov/OWOW/wetlands/index.html

and here is a ground water primer, from Purdue Unv., showing the water table, capilary fring, etc..
http://www.epa.gov/seahome/groundwater/src/ground.htm
(wait, i didn't check, is this the same one Milum posted?)