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Dan Hadley

Research Interests

I'm a full-time Hydrogeologist at the Illinois State water Survey and a part-time PhD student working with Dr. Tom Johnson and Dr. Daniel Abrams. My dissertation research focuses on the hydrogeology of the Sandwich Fault Zone in northern Illinois using groundwater flow modeling, geochemical, and geophysical techniques. The goal of my research is to understand groundwater flow patters around complex fault structures and assess how the fault zone impacts available water supply in the critically stressed Cambrian-Ordovician sandstone aquifer system.


  • M.S., Geology, Northern Arizona University, 2014
  • B.S., Geology, Augustana College, 2008


Highlighted Publications

Hadley, D.R., Abrams, D.B., Mannix, D.H., Cullen C., 2021, Using production well behavior to evaluate risk in the depleted Cambrian-Ordovician sandstone aquifer system, Midwestern USA: Water Resources Research, doi:10.1029/2020WR028844

Hadley, D.R., Abrams, D.B., Roadcap, G.S., 2019, Modeling a Large-Scale Historic Aquifer Test-Insight into the Hydrogeology of a Regional Fault Zone: Groundwater, doi:10.1111/gwat.12922

Mannix, D.H., Abrams, D.B., Hadley, D.R., Roadcap, G.S., 2018, Conceptualizing leakage and storage contributions from long open interval wells in regional deep basin flow models: Hydrologic Processes, doi:10.1002/hyp.13324

Kelly, W.R., Panno, S.V., Hackley, K.C., Hadley, D.R., Mannix, D.H., 2018, Paleohydrogeology of a Paleozoic Sandstone Aquifer within an Intracratonic Basin—Geochemical and Structural Controls: Journal of Hydrology, doi:10.1016/j.jhydrol.2018.09.004

Abrams, D.B., Hadley, D.R., Mannix, D.H., Roadcap, G.S., Meyer, S.C., Hlinka, K.J., Rennels, K.L., Bradbury, K.R., Chase, P.M., and Krause, J.J., 2015, Changing Groundwater Levels in the Sandstone Aquifers of Northern Illinois and Southern Wisconsin─ Impacts on Available Water Supply: Illinois State Water Survey Contract Report 2015-02

Hadley, D.R., Krueger, J.A., Roadcap, G.S., Healy, C.R., 2018, Mapping the Distribution of Water Use in Illinois: ESRI Press, Redlands, CA, ESRI Map Book Series Vol. 33