Wouldn't the overall change in the temp of the aquifer depend on the ballance of cooling versus heating in the overall "system"?
If you pull heat out of the underground water more than you push it back in, maybe you'd eventually freeze the whole aquiffer up and what might that cause! <GRIN> Therese an equation in about a million unknowns for somebody's big computer to model! tom Net-Tamer V 1.13 Beta - Registered