You'll notice that the
aquifer extends to about 2,200 feet below the surface.
Maquoketa shale layer (red layer in
the diagram) above the
aquifer is considered impermeable and acts as a barrier between
the surface and the deeper sandstone aquifer.
The aquifer supplies
southeast Wisconsin with 33.3 million gallons of water per day.
It supplies Illinois with approximately 65
million gallons of water per day.
Keep in mind that we are drawing out ten times more water
than is being recharged into the aquifer.
To date, I have quoted only one textbook in this
Fetter, C.W. Applied Hydrogeology. Upper
Saddle River, New Jersey: Prentice Hall, 2001.
This website has been compiled by Peter G. Greenan. The
site may eventually become incorporated into an on-line earth
science course offered by Northeastern Illinois University some
time in the future.
This website is not complete as of yet.