John F Walker (Former Employee)
Science and Products
Filter Total Items: 42
Evaluation of nonpoint-source contamination, Wisconsin: water year 1999
The objective of the watershed-management evaluation monitoring program in Wisconsin is to evaluate the effectiveness of best-management practices (BMPs) for controlling nonpoint-source pollution in rural and urban watersheds. This progress report provides a summary of the data collected by the U.S Geological Survey for the program and a discussion of the results from several different detailed an
Authors
John F. Walker, D. J. Graczyk, Steven R. Corsi, J.A. Wierl, D.W. Owens
Trout Lake, Wisconsin: A water, energy, and biogeochemical budgets program site
The Trout Lake Watershed is in the Northern Highlands Lake District in north-central Wisconsin. The study area includes four subbasins with five lakes and two bog lakes. The objectives of the Trout Lake WEBB project are to (1) describe processes controlling water and solute fluxes in the Trout Lake watershed, (2) examine interactions among those processes and (3) improve the capability to predict
Authors
John F. Walker, Thomas D. Bullen
Characterizing hydrology and the importance of ground-water discharge in natural and constructed wetlands
Although considered the most important component for the establishment and persistence of wetlands, hydrology has been hard to characterize and linkages between hydrology and other environmental conditions are often poorly understood. In this work, methods for characterizing a wetland’s hydrology from hydrographs were developed, and the importance of ground water to the physical and geochemical co
Authors
Randall J. Hunt, John F. Walker, David P. Krabbenhoft
Optimization of ground-water withdrawal in the lower Fox River communities, Wisconsin
Pumping from closely spaced wells in the Central Brown County area and the Fox Cities area near the north shore of Lake Winnebago has resulted in the formation of deep cones of depression in the vicinity of the two pumping centers. Water-level measurements indicate there has been a steady decline in water levels in the vicinity of these two pumping centers for the past 50 years. This report descri
Authors
J.F. Walker, D. A. Saad, J. T. Krohelski
Measurement of flow under ice covers in North America
A substantial proportion of natural streams in the United States and Canada are affected by ice cover during the winter. To substantiate the currently used procedures for measuring streamflow during the winter, the U.S. Geological Survey (USGS) and Water Survey of Canada (WSC) began independent, coordinated programs for research and development related to the measurement of streamflow under an ice
Authors
J.F. Walker, D. Wang
Evaluation of nonpoint-source contamination, Wisconsin: Land-use and Best-Management-Practices inventory, selected streamwater-quality data, urban-watershed quality assurance and quality control, constituent loads in rural streams, and snowmelt-runoff ana
The objective of the watershed-management evaluation monitoring program in Wisconsin is to evaluate the effectiveness of best-management practices (BMP) for controlling nonpoint-source contamination in rural and urban watersheds. This report is an annual summary of the data collected for the program by the U.S Geological Survey and a report of the results of several different detailed analyses of
Authors
J.F. Walker, D. J. Graczyk, S.R. Corsi, D.W. Owens, J.A. Wierl
Evaluation of nonpoint-source contamination, Wisconsin; selected streamwater-quality data, land-use and best-management practices inventory, and quality assurance and quality control, water year 1993
The objective of the watershed-management evaluation monitoring program in Wisconsin is to evaluate the effectiveness of the best-management practices (BMPs) for rural streams, urban streams, and urban storm sewers. This report is an annual summary of the data collected for the program and a report of the results from several different special studies conducted within this program.
Suspended sedim
Authors
Steven R. Corsi, John F. Walker, D. J. Graczyk, S.R. Greb, D.W. Owens, K.F. Rappold
Statistical Techniques for Assessing water‐quality effects of BMPs
Little has been published on the effectiveness of various management practices in small rural lakes and streams at the watershed scale. In this study, statistical techniques were used to test for changes in water‐quality data from watersheds where best management practices (BMPs) were implemented. Reductions in data variability due to climate and seasonality were accomplished through the use of re
Authors
John F. Walker
Methods for measuring discharge under ice cover
Streamflow-velocity adjustment coefficients at several common vertical positions varied significantly from station to station and from measurement to measurement at some stations. The ice-cover roughness was the primary factor affecting the profiles at most stations. Several discharge-measurement procedures were developed using one-half of the data collected, and the accuracy of the procedures wer
Authors
J.F. Walker
Evaluation of nonpoint-source contamination, Wisconsin: Selected data for 1992 water year
This report presents the annual results of the U.S. Geological Survey's (USGS) watershed-management evaluation monitoring program in Wisconsin. The overall objective of each individual project in the program is to determine if the water chemistry in the receiving stream has changed as a result of the implementation of land-management practices in the watershed. This is accomplished through monitor
Authors
D. J. Graczyk, J.F. Walker, S.R. Greb, Steven R. Corsi, D.W. Owens
Techniques for detecting effects of urban and rural land-use practices on stream-water chemistry in selected watersheds in Texas, Minnesota,and Illinois
Although considerable effort has been expended during the past two decades to control nonpoint-source contamination of streams and lakes in urban and rural watersheds, little has been published on the effectiveness of various management practices at the watershed scale. This report presents a discussion of several parametric and nonparametric statistical techniques for detecting changes in water-c
Authors
J.F. Walker
Preliminary evaluation of effects of best management practices in the Black Earth Creek, Wisconsin, priority watershed
Nonpoint-source contamination accounts for a substantial part of the water quality problems in many watersheds. The Wisconsin Nonpoint Source Water Pollution Abatement Program provides matching money for voluntary implementation of various best management practices (BMPs). The effectiveness of BMPs on a drainage-basin scale has not been adequately assessed in Wisconsin by use of data collected bef
Authors
J.F. Walker, D. J. Graczyk
Science and Products
Filter Total Items: 42
Evaluation of nonpoint-source contamination, Wisconsin: water year 1999
The objective of the watershed-management evaluation monitoring program in Wisconsin is to evaluate the effectiveness of best-management practices (BMPs) for controlling nonpoint-source pollution in rural and urban watersheds. This progress report provides a summary of the data collected by the U.S Geological Survey for the program and a discussion of the results from several different detailed an
Authors
John F. Walker, D. J. Graczyk, Steven R. Corsi, J.A. Wierl, D.W. Owens
Trout Lake, Wisconsin: A water, energy, and biogeochemical budgets program site
The Trout Lake Watershed is in the Northern Highlands Lake District in north-central Wisconsin. The study area includes four subbasins with five lakes and two bog lakes. The objectives of the Trout Lake WEBB project are to (1) describe processes controlling water and solute fluxes in the Trout Lake watershed, (2) examine interactions among those processes and (3) improve the capability to predict
Authors
John F. Walker, Thomas D. Bullen
Characterizing hydrology and the importance of ground-water discharge in natural and constructed wetlands
Although considered the most important component for the establishment and persistence of wetlands, hydrology has been hard to characterize and linkages between hydrology and other environmental conditions are often poorly understood. In this work, methods for characterizing a wetland’s hydrology from hydrographs were developed, and the importance of ground water to the physical and geochemical co
Authors
Randall J. Hunt, John F. Walker, David P. Krabbenhoft
Optimization of ground-water withdrawal in the lower Fox River communities, Wisconsin
Pumping from closely spaced wells in the Central Brown County area and the Fox Cities area near the north shore of Lake Winnebago has resulted in the formation of deep cones of depression in the vicinity of the two pumping centers. Water-level measurements indicate there has been a steady decline in water levels in the vicinity of these two pumping centers for the past 50 years. This report descri
Authors
J.F. Walker, D. A. Saad, J. T. Krohelski
Measurement of flow under ice covers in North America
A substantial proportion of natural streams in the United States and Canada are affected by ice cover during the winter. To substantiate the currently used procedures for measuring streamflow during the winter, the U.S. Geological Survey (USGS) and Water Survey of Canada (WSC) began independent, coordinated programs for research and development related to the measurement of streamflow under an ice
Authors
J.F. Walker, D. Wang
Evaluation of nonpoint-source contamination, Wisconsin: Land-use and Best-Management-Practices inventory, selected streamwater-quality data, urban-watershed quality assurance and quality control, constituent loads in rural streams, and snowmelt-runoff ana
The objective of the watershed-management evaluation monitoring program in Wisconsin is to evaluate the effectiveness of best-management practices (BMP) for controlling nonpoint-source contamination in rural and urban watersheds. This report is an annual summary of the data collected for the program by the U.S Geological Survey and a report of the results of several different detailed analyses of
Authors
J.F. Walker, D. J. Graczyk, S.R. Corsi, D.W. Owens, J.A. Wierl
Evaluation of nonpoint-source contamination, Wisconsin; selected streamwater-quality data, land-use and best-management practices inventory, and quality assurance and quality control, water year 1993
The objective of the watershed-management evaluation monitoring program in Wisconsin is to evaluate the effectiveness of the best-management practices (BMPs) for rural streams, urban streams, and urban storm sewers. This report is an annual summary of the data collected for the program and a report of the results from several different special studies conducted within this program.
Suspended sedim
Authors
Steven R. Corsi, John F. Walker, D. J. Graczyk, S.R. Greb, D.W. Owens, K.F. Rappold
Statistical Techniques for Assessing water‐quality effects of BMPs
Little has been published on the effectiveness of various management practices in small rural lakes and streams at the watershed scale. In this study, statistical techniques were used to test for changes in water‐quality data from watersheds where best management practices (BMPs) were implemented. Reductions in data variability due to climate and seasonality were accomplished through the use of re
Authors
John F. Walker
Methods for measuring discharge under ice cover
Streamflow-velocity adjustment coefficients at several common vertical positions varied significantly from station to station and from measurement to measurement at some stations. The ice-cover roughness was the primary factor affecting the profiles at most stations. Several discharge-measurement procedures were developed using one-half of the data collected, and the accuracy of the procedures wer
Authors
J.F. Walker
Evaluation of nonpoint-source contamination, Wisconsin: Selected data for 1992 water year
This report presents the annual results of the U.S. Geological Survey's (USGS) watershed-management evaluation monitoring program in Wisconsin. The overall objective of each individual project in the program is to determine if the water chemistry in the receiving stream has changed as a result of the implementation of land-management practices in the watershed. This is accomplished through monitor
Authors
D. J. Graczyk, J.F. Walker, S.R. Greb, Steven R. Corsi, D.W. Owens
Techniques for detecting effects of urban and rural land-use practices on stream-water chemistry in selected watersheds in Texas, Minnesota,and Illinois
Although considerable effort has been expended during the past two decades to control nonpoint-source contamination of streams and lakes in urban and rural watersheds, little has been published on the effectiveness of various management practices at the watershed scale. This report presents a discussion of several parametric and nonparametric statistical techniques for detecting changes in water-c
Authors
J.F. Walker
Preliminary evaluation of effects of best management practices in the Black Earth Creek, Wisconsin, priority watershed
Nonpoint-source contamination accounts for a substantial part of the water quality problems in many watersheds. The Wisconsin Nonpoint Source Water Pollution Abatement Program provides matching money for voluntary implementation of various best management practices (BMPs). The effectiveness of BMPs on a drainage-basin scale has not been adequately assessed in Wisconsin by use of data collected bef
Authors
J.F. Walker, D. J. Graczyk