Aquifers of Northeastern Illinois

1
Aquifers of Northeastern Illinois
DeKalb
Chicago
Unconsolidated Aquifer System
SHALLOW AQUIFERS
Shallow Bedrock Aquifer
Deep Bedrock Aquifer System
Elmhurst-Mt. Simon Aquifer
2
Recharge Area for Deep Bedrock Aquifer System is
West of Chicago Area
West
East
Maquoketa Group
Recharge Rate 0.5 in/yr
Recharge Rate 0.05 in/yr
RECHARGE AREA
Cross-section modified from Bretz (1939) Recharge
rates from Walton (1960) and Visocky et al (1985)
3
Recharge Area of Deep Bedrock Aquifer System
Young (1992)
4
Shallow Bedrock Aquifer
West
East
Bedrock Surface
SHALLOW BEDROCK AQUIFER
Silurian dolomite
Maquoketa Shale Group (Ordovician)
Galena and Platteville Group dolomites (Ordovician
)
Bretz (1939)
5
Unconsolidated Aquifer System