Publications
Access selected publications from the USGS Maryland-Delaware-DC Water Science Center. To access the full, searchable catalog of USGS publications, please visit the USGS Publications Warehouse.
Filter Total Items: 378
Application of spatially referenced regression modeling for the evaluation of total nitrogen loading in the Chesapeake Bay watershed Application 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...
Authors
Stephen D. Preston, John W. Brakebill
Nutrient and suspended-sediment concentrations, trends, loads, and yields from the nontidal part of the Susquehanna, Potomac, Patuxent, and Choptank rivers, 1985-96 Nutrient and suspended-sediment concentrations, trends, loads, and yields from the nontidal part of the Susquehanna, Potomac, Patuxent, and Choptank rivers, 1985-96
The Chesapeake Bay River-Input Monitoring Program was established to characterize the water quality of four major rivers in Maryland, and to quantify the load and the long-term trends in concentrations of nutrients (nitrogen and phosphorus) and suspended sediment transported from the nontidal part of each river to the Chesapeake Bay. As part of the River-Input Monitoring Program...
Authors
Linda C. Darrell, Brenda F. Majedi, Joy S. Lizarraga, Joel D. Blomquist
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 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
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...
Authors
L. Joseph Bachman, Bruce D. Lindsey, John W. Brakebill, David S. Powars
Potentiometric surface of the upper Patapsco aquifer in southern Maryland, September - October 1996 Potentiometric surface of the upper Patapsco aquifer in southern Maryland, September - October 1996
No abstract available.
Authors
Stephen E. Curtin, D. C. Andreasen, Frederick K. Mack
Water resources data Maryland and Delaware, water year 1996, Volume 2: Ground-water data Water resources data Maryland and Delaware, water year 1996, Volume 2: Ground-water data
No abstract available.
Authors
M.J. Smigaj, R.W. Saffer, R.J. Starsoneck, J.L. Tegeler
Water resources data Maryland and Delaware, water year 1996, Volume 1. Surface-water data Water resources data Maryland and Delaware, water year 1996, Volume 1. Surface-water data
Water resources data for the 1996 water year for Maryland and Delaware consist of records of stage, discharge, and water quality of streams; stage and contents of lakes and reservoirs. This volume (Volume1. Surface-Water Data) contains records for water discharge at 90 gaging stations; stage and contents 1 reservoir; and water quality at 22 gaging stations. Also included are data for 4...
Authors
R.W. James, B.M. Helinsky, R.H. Simmons, A.J. Tallman
The difference between the potentiometric surfaces of the Magothy Aquifer of September 1975 and September 1995 in southern Maryland The difference between the potentiometric surfaces of the Magothy Aquifer of September 1975 and September 1995 in southern Maryland
A map showing the net change in the poentiometric surface of the Magothy aquifer in the Magothy Formation of Cretaceous age in southern Maryland from September 1975 to September 1995 was based on water-level measurements in 67 wells. The map shows that the decline of the potentiometric surface during the 20-year period ranged from 2 to 21 feet in the northernmost part of the study area...
Authors
Stephen E. Curtin, David C. Andreasen, Frederick K. Mack
Water resources data Maryland and Delaware, water year 1995, Volume 1. Surface-water data Water resources data Maryland and Delaware, water year 1995, Volume 1. Surface-water data
No abstract available.
Authors
R.W. James, R.H. Simmons, B.M. Helinsky
Water resources data Maryland and Delaware, water year 1995, Volume 2: Ground-water data Water resources data Maryland and Delaware, water year 1995, Volume 2: Ground-water data
No abstract available.
Authors
M.J. Smigaj, R.W. Saffer
Potentiometric surface of the Magothy Aquifer in southern Maryland, September 1993 Potentiometric surface of the Magothy Aquifer in southern Maryland, September 1993
No abstract available.
Authors
Stephen E. Curtin, Frederick K. Mack, D. C. Andreasen
Water resources data Maryland and Delaware, water year 1994, Volume 1. Surface-water data Water resources data Maryland and Delaware, water year 1994, Volume 1. Surface-water data
No abstract available.
Authors
R.W. James, R.H. Simmons, B.F. Strain
Water resources data Maryland and Delaware, water year 1994, Volume 2: Ground-water data Water resources data Maryland and Delaware, water year 1994, Volume 2: Ground-water data
No abstract available.
Authors
M.J. Smigaj, R.W. Saffer, J.L. Tegeler