Thanks to Sky Blaylock for supplying this link on Facebook.
Monday, July 11, 2011
Drilling Through Caves and Aquifers
There is a river in Missouri that disappears and then reappears in Arkansas at Mammoth Springs. Determining where water flows underground in northwest Arkansas requires dumping dye into the water at one location then searching for springs and searching for that dye by educated guess work. The dye can be found surprising numbers of miles away.
For a better understanding of aquifers look at the United States Geological Survey (USGS) under Water Science for Schools.
Consider watersheds in general. How can puncturing the ground a mile deep in multiple places not make bedrock permeable?