USGS Professional Pages
U.S. Geological Survey
National Research Program
Denver Federal Center, Box 25046, MS 412
Denver, Colorado 80225
Masters of Divinity (2000). Wesley Theological Seminary, Washington, D.C.
BA Environmental Science (1987). University of Virginia, Charlottesville, Virginia,
DATES From: 2003 To: Present
DESCRIPTION: Research and development focuses on incorporating new simulation algorithms and enhancements of existing algorithms within the Precipitation-Runoff Modeling System (PRMS) and the coupled Modular Groundwater Flow Model (MODFLOW) and PRMS simulation model—GSFLOW. This development work is and cooperative effort between the MOWS project, the Office of Groundwater, and researchers in the Nevada Water Science Center. Development is driven by MOWS research objectives of improving the understanding and simulation of watershed-scale hydrologic processes to climate and anthropogenic influences and environmental characteristics with input and requests from USGS and other Federal agency academic and private sector scientists.
Research and development of the PRMS simulation model, most recently developing methods for input of historic and projected climate; dynamic parameters; and water-use information and enhancement of surface-depression storage and spatial and temporal characterization of model parameters for use in large model domains.
Research and development of the coupled groundwater/surface-water simulation model (GSFLOW) and MODFLOW/UZF Package.
Research and development of a loosely-coupled, sub-daily simulation model using PRMS, NOAA-NWS Lag and K river routing model, and USACE HEC-ResSim Reservoir System Simulation model for a large watershed spanning portions of NY, NJ, and PA.
Hydrologist, project chief and member of the Hydrologic Analysis Software Support Section, Reston, Virginia (1992-1996)
Hydrologist, member of the Modeling of Hydrodynamic Systems project, National Research Program, USGS, Reston, Virginia (1981-1986)
FIVE RELEVANT REPORTS:
Hunt, R.J., Walker, J.W., Selbig, W.R., Westenbroek, S.W., and Regan, R.S., (in review), Simulation of climate change effects on streamflow, lake water budgets, and stream temperature using GSFLOW and SNTEMP, Trout Lake Watershed, Wisconsin, U.S. Geological Survey Scientific Investigation Report 2013-xx, xx p.
Markstrom S.L., Hay L.E., Regan R.S., 2012, Watershed scale response to climate change—Sagehen Creek Basin, California. U.S. Geological Survey Fact Sheet 2011–3121.
Markstrom, S.L., Niswonger, R.G., Regan, R.S., Prudic, D.E., and Barlow, P.M., 2008, GSFLOW-Coupled ground-water and surface-water flow model based on the integration of the Precipitation-Runoff Modeling System (PRMS) and the Modular Ground-Water Flow Model (MODFLOW-2005): U.S. Geological Survey Techniques and Methods 6-D1, 240 p.
Regan, R.S., Lafontaine, J., and Viger, R.J., (in review), Documentation of dynamic parameter, water-use, and climate input and surface-depression storage simulation within the Precipitation Runoff Modeling System (PRMS): U.S. Geological Survey Open-File report 2013-500x: xx p.
Regan, R.S., and Schaffranek, R.W., 1985, A computer program for analyzing channel geometry: U.S. Geological Survey Water-Resources Investigations Report 85-4335, 49 p.
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PublicationsRegan, R.S. and Lafontaine, J.H., (peer reviewed), Documentation of new Dynamic Parameter and Water-Use Input and Summary Output modules and updates to routing of streamflow with on-channel lakes, surface-depression storage simulation, and use of initial conditions within the Precipitation Runoff Modeling System (PRMS): U.S. Geological Survey Open-File report 2014-500x: xx p.
Markstrom, S.L., Regan, R.S., Hay, L.E., Viger, R.J., Webb, R.M.T., and Payne, R.A., 2014, PRMS-IV, the Precipitation-Runoff Modeling System, Version 4: U.S. Geological Survey Techniques and Methods 6-B, XX p. (in review)
Henson, Wesley R.; Medina, Rose L.; Mayers, C. Justin; Niswonger, Richard G.; Regan, R. S., 2013. CRT--Cascade Routing Tool to define and visualize flow paths for grid-based watershed models. U.S. Geological Survey Techniques and Methods 6-D2, Pamphlet: vii, 28 p.; Software
Fulton, J.W., Risser, D.W., Regan, R.S., Hoffman, S.A., Markstrom, S.L., Walker, J.F., and Hunt, R.J., 2013, GSFLOW-derived water budgets for the Spring Creek and Nittany Creek Basins and parts of the Spruce Creek Basin, Centre and Huntingdon Counties, Pennsylvania, 2000-06. U.S. Geological Survey Scientific Investigations Report 2013–XXXX, XX p.
Hunt, R.J., Walker, J.W., Selbig, W.R., Westenbroek, S.W., and Regan, R.S., 2013, Simulation of Climate Change Effects on Streamflow, Lake Water Budgets, and Stream Temperature Using GSFLOW and SNTEMP, Trout Lake Watershed, Wisconsin. U.S. Geological Survey Scientific Investigation Report, 2013-5159, xx p.
LaFontaine, J.H., Hay, L.E., Viger, R.J., Markstrom, S.I., Regan, R.S., Elliott, C.M., and Jones, J.W., 2013, Application of the Precipitation-Runoff Modeling System (PRMS) in the Apalachicola-Flint River Basin in the Southeastern United States: U.S. Geological Survey Scientific Investigations Report 2013-5162, 118 p.
Markstrom, Steven L.; Hay, Lauren E.; Ward-Garrison, D. Christian; Risley, John C.; Battaglin, William A.; Bjerklie, David M.; Chase, Katherine J.; Christiansen, Daniel E.; Dudley, Robert W.; Hunt, Randall J.; Koczot, Kathryn M.; Mastin, Mark C.; Regan, R. Steven; Viger, Roland J.; Vining, Kevin C.; Walker, John F., 2012. Integrated watershed-scale response to climate change for selected basins across the United States. U.S. Geological Survey Scientific Investigations Report 2011-5077, x, 134 p.; Appendix [Link]
Markstrom, Steven L.; Hay, Lauren E.; Regan, R. Steven, 2012. Watershed scale response to climate change--Sagehen Creek Basin, California. U.S. Geological Survey Fact Sheet 2011-3121, 6 p. [Link]
Markstrom, Steven L.; Hay, Lauren E.; Regan, R. Steven., 2011, USGS Fact Sheet: 2011-3121
Goode, Daniel J., Koerkle, Edward H., Hoffman, Scott A., Regan, R. Steve, Hay, Lauren E., and Markstrom, Steven L., 2010, Simulation of Runoff and Reservoir Inflow for Use in a Flood-Analysis Model for the Delaware River, Pennsylvania, New Jersey, and New York, 2004-2006: U.S. Geological Survey Open-File Report 2010-1014, 68 p. [Link]
Simulation of Runoff and Reservoir Inflow for Use in a Flood-Analysis Model for the Delaware River, Pennsylvania, New Jersey, and New York, 2004-2006, U.S. Geological Survey Open-File Report 2010-1014 [Link]
Markstrom, Steven L.; Niswonger, Richard G.; Regan, R. Steven; Prudic, David E.; Barlow, Paul M., 2008. GSFLOW - Coupled Ground-Water and Surface-Water Flow Model Based on the Integration of the Precipitation-Runoff Modeling System (PRMS) and the Modular Ground-Water Flow Model (MODFLOW-2005). Geological Survey (U.S.) Techniques and Methods 6-D1, x, 240 p. [Link]
Niswonger, Richard G.; Prudic, David E.; Regan, R. Steven, 2006. Documentation of the Unsaturated-Zone Flow (UZF1) Package for modeling Unsaturated Flow Between the Land Surface and the Water Table with MODFLOW-2005. Techniques and Methods 6-A19, 74 p.; 14 figs.; 8 tables [Link]
Regan, R. S.; Schaffranek, R. W.; Baltzer, R. A., 1996. Time-dependent Data System (TDDS); an interactive program to assemble, manage, and appraise input data and numerical output of flow/transport simulation models. U.S. Geological Survey ; Branch of Information Services [distributor], Water-Resources Investigations Report 96-4143, vii, 104 p. :ill. ;28 cm.
Regan, R. S.; Schaffranek, R. W., 1985. A computer program for analyzing channel geometry. U.S. Geological Survey ; Open-File Services Section, Western Distribution Branch, Water-Resources Investigations Report 85-4335, v, 49 p. :ill. ;28 cm.
My Science Topics
My USGS Science Strategy AreasA Water Census of the United States
Climate Variability & Change
Understanding Ecosystems & Predicting Ecosystems Change
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