John Brakebill
John Brakebill is the Deputy Director of the Water Mission Area (WMA) Integrated Modeling and Prediction Division.
John provides leadership and management skills for a diverse group of multi-disciplinary researchers, scientists, data analysists, and modelers responsible for developing, maintaining, and applying integrated, interdisciplinary water modeling predictions and forecasts using state-of-the-art enterprise approaches and systems. He previously served as an Associate Director in the Maryland-Delaware-DC Water Science Center where he spent the first 32 years of his career gaining experience in regional and national scale surface-water transport modeling (SPARROW), supervision and management, GIS analysis and applications, and geospatial data development. John also has served as a USGS mentor and is a facilitator for the USGS Leadership Intensive course.
Science and Products
Digital data used to relate nutrient input to water quality in the Chesapeake Bay watershed
Hydrogeomorphic Regions of the Chesapeake Bay Watershed: HGMR
Digital data used to relate nutrient inputs to water quality in the Chesapeake Bay watershed
Application of spatially referenced regression modeling for the evaluation of total nitrogen loading in the Chesapeake Bay watershed
ERF1 -- Enhanced River Reach File 1.2
Ground-water discharge and base-flow nitrate loads of nontidal streams, and their relation to a hydrogeomorphic classification of the Chesapeake Bay watershed, middle Atlantic Coast
Water quality in the Potomac River basin, Maryland, Pennsylvania, Virginia, West Virginia, and the District of Columbia, 1992-96
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Digital data used to relate nutrient input to water quality in the Chesapeake Bay watershed
Digital data sets compiled by the U.S. Geological Survey were used as input for a collection of Spatially Referenced Regressions On Watershed (SPARROW) attributes for the Chesapeake Bay region including parts of Delaware, Maryland, New York, Pennsylvania, Virginia, West Virginia, and the District of Columbia. These regressions use a nonlinear statistical approach to relate nutrient sources and lanAuthorsJohn W. Brakebill, Stephen D. Preston, Sarah K. MartucciHydrogeomorphic Regions of the Chesapeake Bay Watershed: HGMR
Generalized lithology (rock type) and physiography based on geologic formations were used to characterize hydrgeomorphic regions (HGMR) within the Chesapeake Bay watershed. These HGMRs were used in conjunction with existing data to assess the significance of ground-water discharge as a source of nitrate load to nontidal streams in the Chesapeake Bay watershed (Bachman and others, 1998). This workAuthorsJohn W. Brakebill, S.K. KelleyDigital data used to relate nutrient inputs to water quality in the Chesapeake Bay watershed
Digital data sets were compiled by the U. S. Geological Survey (USGS) and used as input for a collection of Spatially Referenced Regressions On Watershed attributes for the Chesapeake Bay region. These regressions relate streamwater loads to nutrient sources and the factors that affect the transport of these nutrients throughout the watershed. A digital segmented network based on watershed boundarAuthorsJohn W. Brakebill, Stephen D. PrestonApplication of spatially referenced regression modeling for the evaluation of total nitrogen loading in the Chesapeake Bay watershed
The reduction of stream nutrient loads is an important part of current efforts to improve water quality in the Chesapeake Bay. To design programs that will effectively reduce stream nutrient loading, resource managers need spatially detailed information that describes the location of nutrient sources and the watershed factors that affect delivery of nutrients to the Bay. To address this need, theAuthorsStephen D. Preston, John W. BrakebillERF1 -- Enhanced River Reach File 1.2
U.S. Environmental Protection Agency's River Reach File 1 (RF1) to ensure the hydrologic integrity of the digital reach traces and to quantify the mean water time of travel in river reaches and reservoirs [see USEPA (1996) for a description of the original RF1].AuthorsRichard B. Alexander, John W. Brakebill, Robert E. Brew, Richard A. SmithGround-water discharge and base-flow nitrate loads of nontidal streams, and their relation to a hydrogeomorphic classification of the Chesapeake Bay watershed, middle Atlantic Coast
Existing data on base-flow and groundwater nitrate loads were compiled and analyzed to assess the significance of groundwater discharge as a source of the nitrate load to nontidal streams of the Chesapeake Bay watershed. These estimates were then related to hydrogeomorphic settings based on lithology and physiographic province to provide insight on the areal distribution of ground-water discharge.AuthorsL. Joseph Bachman, Bruce D. Lindsey, John W. Brakebill, David S. PowarsWater quality in the Potomac River basin, Maryland, Pennsylvania, Virginia, West Virginia, and the District of Columbia, 1992-96
No abstract available.AuthorsScott W. Ator, Joel D. Blomquist, John W. Brakebill, Janet M. Denis, Matthew J. Ferrari, Cherie V. Miller, Humbert Zappia