Peter B McMahon (Former Employee)
Science and Products
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Overview of groundwater quality in the Piceance Basin, western Colorado, 1946--2009 Overview of groundwater quality in the Piceance Basin, western Colorado, 1946--2009
Groundwater-quality data from public and private sources for the period 1946 to 2009 were compiled and put into a common data repository for the Piceance Basin. The data repository is available on the web at http://rmgsc.cr.usgs.gov/cwqdr/Piceance/index.shtml. A subset of groundwater-quality data from the repository was compiled, reviewed, and checked for quality assurance for this...
Authors
J.C. Thomas, P.B. McMahon
A framework for quantitative assessment of impacts related to energy and mineral resource development A framework for quantitative assessment of impacts related to energy and mineral resource development
Natural resource planning at all scales demands methods for assessing the impacts of resource development and use, and in particular it requires standardized methods that yield robust and unbiased results. Building from existing probabilistic methods for assessing the volumes of energy and mineral resources, we provide an algorithm for consistent, reproducible, quantitative assessment of...
Authors
Seth S. Haines, James Diffendorfer, Laurie S. Balistrieri, Byron R. Berger, Troy A. Cook, Donald L. Gautier, Tanya J. Gallegos, Margot Gerritsen, Elisabeth Graffy, Sarah Hawkins, Kathleen Johnson, Jordan Macknick, Peter McMahon, Tim Modde, Brenda Pierce, John H. Schuenemeyer, Darius J. Semmens, Benjamin Simon, Jason Taylor, Katherine Walton-Day
Assessing the relative bioavailability of DOC in regional groundwater systems Assessing the relative bioavailability of DOC in regional groundwater systems
It has been hypothesized that the degree to which a hyperbolic relationship exists between concentrations of dissolved organic carbon (DOC) and dissolved oxygen (DO) in groundwater may indicate the relative bioavailability of DOC. This hypothesis was examined for 73 different regional aquifers of the United States using 7745 analyses of groundwater compiled by the National Water...
Authors
Francis H. Chapelle, Paul M. Bradley, Celeste A. Journey, Peter B. McMahon
Use of classes based on redox and groundwater age to characterize the susceptibility of principal aquifers to changes in nitrate concentrations, 1991 to 2010 Use of classes based on redox and groundwater age to characterize the susceptibility of principal aquifers to changes in nitrate concentrations, 1991 to 2010
The National Water-Quality Assessment (NAWQA) Program of the U.S. Geological Survey is using multiple approaches to measure and explain trends in concentrations of nitrate in principal aquifers of the United States. Near decadal sampling of selected well networks is providing information on where long-term changes in nitrate concentrations have occurred. Because those studies do not...
Authors
P.B. McMahon
Groundwater depletion and sustainability of irrigation in the US High Plains and Central Valley Groundwater depletion and sustainability of irrigation in the US High Plains and Central Valley
Aquifer overexploitation could significantly impact crop production in the United States because 60% of irrigation relies on groundwater. Groundwater depletion in the irrigated High Plains and California Central Valley accounts for ∼50% of groundwater depletion in the United States since 1900. A newly developed High Plains recharge map shows that high recharge in the northern High Plains...
Authors
Bridget R. Scanlon, Claudia C. Faunt, Laurent Longuevergne, Robert C. Reedy, William M. Alley, Virginia L. McGuire, Peter B. McMahon
Preliminary assessment of sources of nitrogen in groundwater at a biosolids-application area near Deer Trail Preliminary assessment of sources of nitrogen in groundwater at a biosolids-application area near Deer Trail
Concentrations of dissolved nitrite plus nitrate increased fairly steadily in samples from four shallow groundwater monitoring wells after biosolids applications to nonirrigated farmland began in 1993. The U.S. Geological Survey began a preliminary assessment of sources of nitrogen in shallow groundwater at part of the biosolids-application area near Deer Trail, Colorado, in 2005 in...
Authors
Tracy J.B. Yager, Peter B. McMahon
Science and Products
Filter Total Items: 14
No Result Found
Filter Total Items: 118
Overview of groundwater quality in the Piceance Basin, western Colorado, 1946--2009 Overview of groundwater quality in the Piceance Basin, western Colorado, 1946--2009
Groundwater-quality data from public and private sources for the period 1946 to 2009 were compiled and put into a common data repository for the Piceance Basin. The data repository is available on the web at http://rmgsc.cr.usgs.gov/cwqdr/Piceance/index.shtml. A subset of groundwater-quality data from the repository was compiled, reviewed, and checked for quality assurance for this...
Authors
J.C. Thomas, P.B. McMahon
A framework for quantitative assessment of impacts related to energy and mineral resource development A framework for quantitative assessment of impacts related to energy and mineral resource development
Natural resource planning at all scales demands methods for assessing the impacts of resource development and use, and in particular it requires standardized methods that yield robust and unbiased results. Building from existing probabilistic methods for assessing the volumes of energy and mineral resources, we provide an algorithm for consistent, reproducible, quantitative assessment of...
Authors
Seth S. Haines, James Diffendorfer, Laurie S. Balistrieri, Byron R. Berger, Troy A. Cook, Donald L. Gautier, Tanya J. Gallegos, Margot Gerritsen, Elisabeth Graffy, Sarah Hawkins, Kathleen Johnson, Jordan Macknick, Peter McMahon, Tim Modde, Brenda Pierce, John H. Schuenemeyer, Darius J. Semmens, Benjamin Simon, Jason Taylor, Katherine Walton-Day
Assessing the relative bioavailability of DOC in regional groundwater systems Assessing the relative bioavailability of DOC in regional groundwater systems
It has been hypothesized that the degree to which a hyperbolic relationship exists between concentrations of dissolved organic carbon (DOC) and dissolved oxygen (DO) in groundwater may indicate the relative bioavailability of DOC. This hypothesis was examined for 73 different regional aquifers of the United States using 7745 analyses of groundwater compiled by the National Water...
Authors
Francis H. Chapelle, Paul M. Bradley, Celeste A. Journey, Peter B. McMahon
Use of classes based on redox and groundwater age to characterize the susceptibility of principal aquifers to changes in nitrate concentrations, 1991 to 2010 Use of classes based on redox and groundwater age to characterize the susceptibility of principal aquifers to changes in nitrate concentrations, 1991 to 2010
The National Water-Quality Assessment (NAWQA) Program of the U.S. Geological Survey is using multiple approaches to measure and explain trends in concentrations of nitrate in principal aquifers of the United States. Near decadal sampling of selected well networks is providing information on where long-term changes in nitrate concentrations have occurred. Because those studies do not...
Authors
P.B. McMahon
Groundwater depletion and sustainability of irrigation in the US High Plains and Central Valley Groundwater depletion and sustainability of irrigation in the US High Plains and Central Valley
Aquifer overexploitation could significantly impact crop production in the United States because 60% of irrigation relies on groundwater. Groundwater depletion in the irrigated High Plains and California Central Valley accounts for ∼50% of groundwater depletion in the United States since 1900. A newly developed High Plains recharge map shows that high recharge in the northern High Plains...
Authors
Bridget R. Scanlon, Claudia C. Faunt, Laurent Longuevergne, Robert C. Reedy, William M. Alley, Virginia L. McGuire, Peter B. McMahon
Preliminary assessment of sources of nitrogen in groundwater at a biosolids-application area near Deer Trail Preliminary assessment of sources of nitrogen in groundwater at a biosolids-application area near Deer Trail
Concentrations of dissolved nitrite plus nitrate increased fairly steadily in samples from four shallow groundwater monitoring wells after biosolids applications to nonirrigated farmland began in 1993. The U.S. Geological Survey began a preliminary assessment of sources of nitrogen in shallow groundwater at part of the biosolids-application area near Deer Trail, Colorado, in 2005 in...
Authors
Tracy J.B. Yager, Peter B. McMahon