A. Scott Andres


Scott Andres has been a hydrogeologist with the Delaware Geological Survey since 1984 during which time he has worked, published, and presented on a variety of ground and surface water projects and issues. Scott began a career in hydrogeology in 1980 with the New Jersey Department of Environmental Protection, where he was responsible for investigating ground-water pollution incidents.

Recent research efforts related to water resources have focused on effects of agriculture and land based disposal of wastewater on soils, rocks, and ground and surface waters, use of automated sensors for high-frequency monitoring of groundwater and watershed-scale water quality, ground-water modeling, submarine groundwater discharge, and large scale mapping and characterization of aquifer hydrology, geometries, and hydraulics. These efforts have included collaborative projects with researchers from other University of Delaware departments, other universities, U. S. Geological Survey, U.S. Department of Agriculture, and Delaware Department of Natural Resources and Environmental Control.

Besides research, Mr. Andres participates in a number of advisory boards, working groups, review panels, and committees for government, academia, and professional societies. Over the years, Mr. Andres has trained and advised dozens of students that have gone on into water resources related careers in consulting, government, and academia.

Mr. Andres has a secondary appointment as Associate Professor in the Department of Geological Sciences in the College of Earth, Ocean, and Environment.

DGS Publications
OFR53 Kent County Groundwater Monitoring Project: Results of Subsurface Exploration ( )
RI82 Southern New Castle – Northern Kent Counties Groundwater Monitoring Project: Results of Subsurface Exploration and Hydrogeological Studies ( )
OFR52 Results of Groundwater Flow Simulations In the East Dover Area, Delaware ( )
OFR51 Groundwater Monitoring Procedures Part 1: Equipment and Procedures for Manual and Automated Field Measurement of Groundwater Levels in Dedicated Monitoring Wells ( )
RI80 Investigation of Submarine Groundwater Discharge at Holts Landing State Park, Delaware: Hydrogeologic Framework, Groundwater Level and Salinity Observations ( )
B21A Evaluation of Wastewater Treatment Options Used in Rapid Infiltration Basin Systems (RIBS) ( )
B21B Hydrogeology of a Rapid Infiltration Basin System (RIBS) at Cape Henlopen State Park, Delaware ( )
B21C Groundwater Quality and Monitoring of Rapid Infiltration Basin Systems (RIBS), Theory and Field Experiments at Cape Henlopen State Park, Delaware ( )
B21D Using Numerical Models to Assess a Rapid Infiltration Basin System (RIBS), Cape Henlopen State Park, Delaware ( )
GM23 Geologic Map of the Seaford West and Seaford East Quadrangles, Delaware ( )
RI79 Simulation of Groundwater Flow and Contaminant Transport in Eastern Sussex County, Delaware With Emphasis on Impacts of Spray Irrigation of Treated Wastewater ( )
GM19 Geologic Map of the Frankford and Selbyville Quadrangles, Delaware ( )
RI77 Simulation of Groundwater Flow in Southern New Castle County, Delaware ( )
OFR49 Hydrologeologic Framework of Southern New Castle County ( )
OFR48 Results of the Domestic Well Water-Quality Study ( )
Lehigh University, 1984, M.S., Geology
Lehigh University, 1980, B.S., Environmental Science and Resource Management and Geology

Inland Bays Scientific & Technical Advisory Committee (Chair 2012 - 2019), USDA SERA IEG-17 Information Exchange Group, DNREC CTAC Source Water Protection Program, Wisconsin State Water Resources Program Review Panel, South Carolina Sea Grant Program Research Review Panel, ACWI SOGW - Various Workgroups, Delaware EPSCoR Proposal Review Panel

External Publications

Robinson, J., L. Slater, A. Buda, A. Shober, A.S. Andres, in press, Electrical monitoring of saline tracers to reveal subsurface flow pathways in a flat ditch-drained field: Journal of Hydrology,

Andres, A.S., Main, C.R., Pettay, D.T., and Ullman, W.J., 2019, Hydrophysical and Hydrochemical Controls of 
Cyanobacterial Blooms in Coursey Pond, Delaware (USA): Journal of Environmental Quality, 


Andres, A.S., Ballestero, T.P., and Musick, M.L., 2018, Stormwater management: when is green not so green?:Groundwater, v. 56, No.3, https://doi.org/10.1111/gwat.12653

Vidon, P., D.L. Karwan, A.S. Andres, S. Inamdar, S. Kaushal, J.M., J. Mullaney, D.S. Ross, A.W. Schroth, J.B. Shanley, B. Yoon, 2018, In the path of the Hurricane: impact of Hurricane Irene and Tropical Storm Lee on watershed hydrology and biogeochemistry from North Carolina to Maine, USA: Biogeochemistry, https://doi.org/10.1007/s10533-018-0423-4

Shober, A.L, Buda, A.R., Turner, K.C., Fiorellino, N.M., Andres, A.S., McGrath, J.M.,  and Sims, J.T., 2017, Assessing coastal plain risk indices for subsurface phosphorus loss:  Journal of Environmental Quality, http://dx.doi:10.2134/jeq2017.03.0102

Vaughan, M. C. H. , W. B. Bowden, J. B. Shanley, A. Vermilyea, R. Sleeper, A. N. Gold, S. Pradhanang, S. P. Inamdar, D. F. Levia, A. S. Andres, F. Birgand, A. W. Schroth, 2017, High-resolution dissolved organic carbon and nitrate measurements reveal differences in storm hysteresis and loading in relation to land cover and seasonality: Water Resources Research, v. 53, doi:10.1002/2017WR020491

Russoniello, C.J., L.F. Konikow, K.D. Kroeger, C.F. Fernandez, A.S. Andres, H.A. Michael, 2016, Hydrogeologic controls on groundwater discharge and nitrogen loads in a coastal watershed: Journal of Hydrology, http://dx.doi.org/10.1016/j.hydro.2016.05.013.

Andres, A.S., and Sims, J. T., 2013, Assessing potential impacts of a wastewater rapid infiltration basin system on groundwater quality – case study in Sussex County, Delaware: Journal of Environmental Quality, v. 42, p. 391-404.

Russoniello, C.J., Fernandez, C., Bratton, J. F., Banaszak, J. F., Krantz, D. E., Andres, A. S., Konikow, L. F., and Michael, H. A., 2013, Geologic effects on groundwater salinity and discharge into an estuary: Journal of Hydrology, v. 498, p. 1-12.

Akhavan, M., Imhoff, P.T., Andres, A.S.,and Fensterle, S., 2013, Model evaluation of denitrification under rapid infiltration basin systems: Journal of Contaminant Hydrology, v. 152, p. 18-34.

Akhavan, M., Imhoff, P.T., Fensterle, S., and Andres, A.S., 2012, Application of a coupled overland flow-vadose zone model to Rapid Infiltration Basin Systems: Vadose Zone Journal, v. 11.

Volk, J. A., Scudlark, J.R., Savidge, K., Stenger, R. J., Andres, A. S., and Ullman, W. J., 2011, Intra- and inter-annual trends in phosphorus loads and comparison with nitrogen loads to Rehoboth Bay, Delaware (USA): Estuarine, Coastal and Shelf Science, DOI: 10.1016/j.ecss.2011.10.023

2006, Koterba, M.T., Andres, A.S., Vrabel, J., Crilley, D. M., Szabo, S., DeWild, J.F., Aiken, G.R., and Reyes-Padro, B., Occurrence and distribution of Mercury in the surficial aquifer, Long Neck Peninsula, Sussex County, Delaware: U.S. Geological Survey Scientific Investigations Report 2006-5011, 62 p.

2006, Jennings, J.A., Savidge, K.B., Scudlark, J.R., Andres, A.S., and Ullman, W.J., Nitrogen loads through baseflow, stormflow, and underflow form the watershed to Rehoboth Bay, Delaware: Journal of Environmental Quality v.35, p. 1742-1755.

2004, Haefner, R.J., and Andres, A.S., Serving ground water data on the Internet: Issues for the future: Groundwater, vol.42, no.3 p. 323-324.

2001, Karr, J.D., Showers, W.J., Gilliam, J.W., and Andres, A.S., Tracing nitrate transport and environmental impact from intensive swine farming using delta-N-15: Journal of Environmental Quality, p. 1163-1175.

Ullman, W. J., Wong, K. C., Madsen, J. A., Scudklark, J. R., Krantz, D. E., Andres, A. S., and McKenna, T. E., 2001,  Nutrient transport and cycling in an agriculturally impacted coastal watershed: multidisciplinary approaches to interdisciplinary environmental problems: Proceedings of the 5th annual Environmental Engineering Event.

1995, Andres, A.S., Nitrate Loss Via Ground Water Flow, Coastal Sussex County, Delaware, in K. Steele, ed., Animal Waste and the Land-Water Interface: Boca Raton, FL, CRC Press, Inc., p. 69-75.

1993, Andres, A.S., Nitrate contamination of ground and surface waters, coastal Sussex County, Delaware: Hydrological Science and Technology, (additional proceedings for the 1993 Joint USA/CIS Conference on Environmental Hydrology and Hydrogeology), vol.9, no.3.

Abstracts, Lectures and Presentations

Andres, A.S. and McQuiggan, R.W., 2019, and McQuiggan, R.W., 2019, Challenges of characterizing impacts of de-icing salt in a heterogeneous aquifer: Proceedings of the 2019 AGU annual meeting.

Andres, A.S., C.R. Main, D.T. Pettay, and W.J. Ullman, 2018, Biogeochemical responses of a Coastal Plain pond to hydrologic and nutrient loading variability – implications for longterm management and mitigation: Proceedings of the 2018 AGU annual meeting

Andres, A.S., Y.G. Voynova, C. Main, D.T. Pettay, W.J. Ullman, 2017, Meteorologic forcing of the biogeochemistry of the Murderkill River  and Estuary, Delaware, USA: 2017 AGU Chapman Conference on Extreme Events.

Andres, A.S., Callahan, J.C., He, C., Mckenna, T.E., and Wunsch, D.R., 2016, Delaware joins the National Ground Water Monitoring Network: Proceedings of the 2016 NGWA Summit

Andres, A.S., 2015, Update on groundwater monitoring in Delaware: Delaware River Basin Commission Water Management Workshop, October 25, 2015, Trenton, NJ

Andres, A.S., 2015, Groundwater in Delaware – 15 minutes for a misunderstood resource: Delaware Legislative Clean Water Task Force, October 15, 2015, Dover, DE

Andres, A. S.,2015, Near surface faults, carbonate cementation, and microkarst in Mid-Atlantic Coastal Plain aquifers: Proceedings of the 2015 NGWA Summit

Andres, A. S., Ullman, W.J., Voynova, Y.,2014, High frequency water quality and flow observations of a hypereutrophic Coastal Plain millpond, Proceedings of the 2014 AGU annual meeting

Andres, A. S., and Coppa, Z.J.,2014, Use of radiocarbon dating to evaluate sustainability of groundwater pumping in Delaware, Proceedings of the 2014 NGWA Summit

Andres, A. S., Michael, H., Madsen, J., Russoniello, C., Fernandez, C., Bratton, J., Cross, V., 2013 Integration of multiple geophysical techniques to image a submarine groundwater discharge zone, Proceedings of the 2013 NGWA Summit

Kroeger, K.D, Fernandez, C., Russoniello, C.J., Andres, A.S., Bratton, J.F., Bohlke, J.K., Konikow, L.F., Michael, H.A., 2012 , Denitrification and nitrogen loading at the aquifer/estuary interface: the role of coastal hydrology and implications for management of nitrogen loads: Proceedings 2012 Ocean Science Conference

Andres, A. S., 2012, Effects of Long-Term Over-Application of P on Management and Sustainability of Groundwater Resources: Proceedings of the 2012 NGWA Summit

Imhoff, P., Akhavan, M., Andres, S., Finsterle, S., 2012 Modeling Engineered Approaches to Enhance Denitrification under Rapid Infiltration Basins: 2012 AGU Annual Meeting.

Andres, A.S., McCreary, P.S., Russoniello, C.J., Fernandez, C., Myers, K., Musetto, A., Michael, H.A., 2011, Case study of using offshore wells for monitoring submarine groundwater discharge, Indian River Bay, Delaware: Proceedings of the 2011 NGWA Summit.

Akhavan, M., Imhoff, P. Andres, S., Finsterle, S., (2011) Modeling Nitrogen Loses under Rapid Infiltration Basins, 2011 AGU annual meeting

Andres, A.S., and Walther, E. F., 2010, Soil-aquifer-treatment in the mid-Atlantic - is it disposal or reuse? Proceedings of the Sixth International Conference on Sustainable Water Environment

Andres, A. S., and Walther, E. F., 2010, Development and application of a GIS screening tool for locating RIBS: Proceedings of the 2010 NGWA Summit.

Andres, A.S., Turkmen, M., Walther, E.F., and He, C., 2009, Impact of Rapid Infiltration Basin Systems (RIBS) on Ground Water in the mid-Atlantic Coastal Plain:  Proceedings of the 2009 NGWA Summit.

Andres, A. S., and Job, C., 2008, Progress Report from the Data Standards and Data Management Workgroup of the Subcommittee on Ground Water: Proceedings of the 2008 National Monitoring Conference, WEFTEC.

He, C., and Andres, A. S., 2008, Hydrogeological evaluation of a rapid infiltration basins site in coastal area: Field investigation and numerical modeling: American Geophysical Union Fall Meeting

Andres, A. S, and Ullman, W. J., 2008, N and P Transport Processes in a Mid-Atlantic Coastal Plain Watershed: Proceedings of the 2008 National Monitoring Conference, WEFTEC.

He, C., and Andres, A. S., 2007, Using geophysical logs and Markov-chain method to map hydraulic property zones:  American Geophysical Union Fall Meeting

Andres, A. S., Klingbeil, A. D., and Taylor, E. 2006, Three-dimensional mapping applications at the Delaware Geological Survey, Geological Society of America Abstracts with programs.

Pellerito, V., Neimeister, M. P., and Andres, A. S., 2005, Development of a groundwater contaminant database for historic occurrence of contaminants in Delaware shallow domestic wells: Geological Society of America Abstracts with Programs.

Neimeister, M. P., Pellerito, V., and Andres, A. S., 2005, Modeling ground-water contaminant flowpaths in Delaware: Geological Society of America Abstracts with Programs.

Andres, A. S., Savidge, K. D., and Ullman, W. J., 2005, Phosphorus loss from end-member watersheds in southern Delaware: Proceedings of the SERA-17 – Phosphorus Working Group Annual Meeting

Duffy, C. A., and Andres, A. S., 2003, Ground-water flow modeling assessment of Lewes-Rehoboth wellhead protection areas: Proceedings of the American Water Resources Association Annual Meeting p. 269.

Andres, A. S., 2002, Geochemical indicators of Base and Storm Flows in Four Small Coastal Plain Watersheds in Delaware: National Ground Water Association, Linking Surface and Subsurface Hydrology - From Science to Technology, p. 49.

Andres, A. S., 2002, Surface water - ground water interactions and non-pont source pollution In the Delaware Inland Bays watershed challenges for meeting TMDL requirements: Proceedings of the American Water Resources Association Annual Meeting, p. 276.

Andres, A. S., 2001, The Cypress Swamp Formation, a new lithostratigraphic unit in Delaware: Geological Society of America, Abstracts with programs v. 33, no. 2, p. 60.

Andres, A. S., Savidge, K., Carey, W., Roadman, M., Scudlark, J., Ullman, W. J., 2000, Nutrient biogeochemistry of Delaware’s Inland Bays and their watershed: Geological Society of America, v. 32, no. 2 p. A-2.

Andres, A. S., 1998, Geochemical heterogeneities due to artificial drainage and geologic controls: Implications for fate and transport of nitrogen and phosphorus: in, Dealing with hydrogeologic heterogeneity: resolutions to the problem and remaining limitations, AGWS&E-NGWA 1998 Annual meeting abstract book, p. 54.

Andres, A. S., Howard, C. S., and Pautler, M. C., 1998, Possible influence of sampling design on monitoring of P in the water table aquifer of the Mid-Atlantic Coastal Plain, in, Agricultural phosphorus in the Chesapeake Bay watershed: Current status and future trends: Chesapeake Bay Program Scientific and Technical Advisory Committee, p. 1.