Glenn Hodgkins
Glenn Hodgkins is a Research Hydrologist with the New England Water Science Center.
Glenn's work in recent years has focused on statistical hydrology at the regional, national, and international scale, primarily on the analysis of change and variability of historical streamflow and groundwater, and also on probabilistic forecasting and model evaluation. Glenn is the lead author or co-author on 28 peer-reviewed articles in hydrology and climate journals and 31 USGS scientific reports.
Professional Experience
Research Hydrologist, U.S. Geological Survey, New England Water Science Center, 2014 to Present
Hydrologist, U.S. Geological Survey, New England Water Science Center, 1994 to 2014
Hydrologist, U.S. Geological Survey, Indiana Water Science Center, 1990 to 1994
Education and Certifications
M.S. Engineering, Purdue University, 1995
B.S. Civil Engineering, University of Maine, 1990
Science and Products
Modeled future peak streamflows in four coastal Maine rivers
Historical groundwater trends in northern New England and relations with streamflow and climatic variables
Reference hydrologic networks II. Using reference hydrologic networks to assess climate-driven changes in streamflow
Reference hydrologic networks I. The status and potential future directions of national reference hydrologic networks for detecting trends
Relations between winter climatic variables and April streamflows in New England and implications for summer streamflows
Watershed scale response to climate change--Cathance Stream Basin, Maine
Historical summer base flow and stormflow trends for New England rivers
River base flow is important to aquatic ecosystems, particularly because of its influence on summer water temperatures. Summer (June through September) daily mean streamflows were separated into base flow and stormflow components by use of an automated method at 25 stations in the New England region of the United States that drain predominantly natural basins. Summer monthly mean base flows increa
Quantifying effects of climate change on the snowmelt-dominated groundwater resources of northern New England
Historical ice-out dates for 29 lakes in New England, 1807-2008
Historical changes in annual peak flows in Maine and implications for flood-frequency analyses
Historical changes in annual peak flows in Maine and implications for flood-frequency analyses
Framework for a U.S. Geological Survey hydrologic climate-response program in Maine
Science and Products
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Filter Total Items: 64
Modeled future peak streamflows in four coastal Maine rivers
To safely and economically design bridges and culverts, it is necessary to compute the magnitude of peak streamflows that have specified annual exceedance probabilities (AEPs). These peak flows are also needed for effective floodplain management. Annual precipitation and air temperature in the northeastern United States are in general projected to increase during the 21st century (Hayhoe and otherAuthorsGlenn A. Hodgkins, Robert W. DudleyHistorical groundwater trends in northern New England and relations with streamflow and climatic variables
Water-level trends spanning 20, 30, 40, and 50 years were tested using month-end groundwater levels in 26, 12, 10, and 3 wells in northern New England (Maine, New Hampshire, and Vermont), respectively. Groundwater levels for 77 wells were used in interannual correlations with meteorological and hydrologic variables related to groundwater. Trends in the contemporary groundwater record (20 and 30 yeAuthorsRobert W. Dudley, Glenn A. HodgkinsReference hydrologic networks II. Using reference hydrologic networks to assess climate-driven changes in streamflow
Reference hydrologic networks (RHNs) can play an important role in monitoring for changes in the hydrological regime related to climate variation and change. Currently, the literature concerning hydrological response to climate variations is complex and confounded by the combinations of many methods of analysis, wide variations in hydrology, and the inclusion of data series that include changes inAuthorsDonald H. Burn, Jamie Hannaford, Glenn A. Hodgkins, Paul H. Whitfield, Robin Thorne, Terry MarshReference hydrologic networks I. The status and potential future directions of national reference hydrologic networks for detecting trends
Identifying climate-driven trends in river flows on a global basis is hampered by a lack of long, quality time series data for rivers with relatively undisturbed regimes. This is a global problem compounded by the lack of support for essential long-term monitoring. Experience demonstrates that, with clear strategic objectives, and the support of sponsoring organizations, reference hydrologic netwoAuthorsPaul H. Whitfield, Donald H. Burn, Jamie Hannaford, Hélène Higgins, Glenn A. Hodgkins, Terry Marsh, Ulrich LooserRelations between winter climatic variables and April streamflows in New England and implications for summer streamflows
A period of much below normal streamflow in southern New England during April 2012 raised concerns that a long-term period of drought could evolve through late spring and summer, leading to potential water availability issues. To understand better the relations between winter climatic variables and April streamflows, April streamflows from 31 streamflow gages in New England that drain relatively nAuthorsGlenn A. Hodgkins, Robert W. Dudley, Luther SchalkWatershed scale response to climate change--Cathance Stream Basin, Maine
General Circulation Model simulations of future climate through 2099 project a wide range of possible scenarios. To determine the sensitivity and potential effect of long-term climate change on the freshwater resources of the United States, the U.S. Geological Survey Global Change study, "An integrated watershed scale response to global change in selected basins across the United States" was startAuthorsRobert W. Dudley, Lauren E. Hay, Steven L. Markstrom, Glenn A. HodgkinsHistorical summer base flow and stormflow trends for New England rivers
River base flow is important to aquatic ecosystems, particularly because of its influence on summer water temperatures. Summer (June through September) daily mean streamflows were separated into base flow and stormflow components by use of an automated method at 25 stations in the New England region of the United States that drain predominantly natural basins. Summer monthly mean base flows increa
AuthorsGlenn A. Hodgkins, Robert W. DudleyQuantifying effects of climate change on the snowmelt-dominated groundwater resources of northern New England
Recent U.S. Geological Survey (USGS) climate studies in New England have shown substantial evidence of hydrologic changes during the last 100 years, including trends toward earlier snowmelt runoff, decreasing occurrence of river ice, and decreasing winter snowpack. These studies are being expanded to include investigation of trends in groundwater levels and fluctuations. Groundwater is an importanAuthorsRobert W. Dudley, Glenn A. Hodgkins, James B. Shanley, Thomas J. MackHistorical ice-out dates for 29 lakes in New England, 1807-2008
Ice-out dates for lakes are an important hydrologic data series for climate-change research. Historical ice-out dates for 29 lakes in New England from 1807 through 2008 were compiled and are presented in this report. Five lakes have more than 160 years of data and another 14 have more than 100 years of data. The oldest record ice-out date is for Sebago Lake in 1807.AuthorsGlenn A. HodgkinsHistorical changes in annual peak flows in Maine and implications for flood-frequency analyses
Flood-frequency analyses use statistical methods to compute peak streamflows for selected recurrence intervals— the average number of years between peak flows that are equal to or greater than a specified peak flow. Analyses are based on annual peak flows at a stream. It has long been assumed that the annual peak streamflows used in these computations were stationary (non-changing) over very longAuthorsGlenn A. HodgkinsHistorical changes in annual peak flows in Maine and implications for flood-frequency analyses
To safely and economically design bridges, culverts, and other structures that are in or near streams (fig. 1 for example), it is necessary to determine the magnitude of peak streamflows such as the 100-year flow. Flood-frequency analyses use statistical methods to compute peak flows for selected recurrence intervals (100 years, for example). The recurrence interval is the average number of yearsAuthorsGlenn A. HodgkinsFramework for a U.S. Geological Survey hydrologic climate-response program in Maine
It is important to monitor hydrologic systems in the United States that could change dramatically over the short term as a result of climate change. Many ecological effects of climate change can be understood only if hydrologic data networks are in place. Because of its humid, temperate climate and its substantial annual snowpack, Maine’s seasonal water cycle is sensitive to air temperature changeAuthorsGlenn A. Hodgkins, Robert M. Lent, Robert W. Dudley, Charles W. Schalk - News