Geospatial data to support analysis of water-quality conditions in basin-fill aquifers in the southwestern United States

McKinney, Tim S.; Anning, David W.

doi:10.3133/sir20085239

Cited by 5 publications

(10 citation statements)

References 3 publications

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“…The climate of the sediment-filled basins is arid to semiarid-average precipitation in the study basins ranges from about 6 inches per year (in/yr) in Las Vegas Valley, Nevada, to almost 22 in/yr in the northern Central Valley, California. (4) The surrounding mountains can receive much more precipitation than the basins, much of it as snow ( fig. 3-1).…”

Section: What Types Of Wells Were Sampled and How Might That Affect mentioning

confidence: 99%

“…Paleorecharge, that is, groundwater recharge that occurred during the last glacial period, is a major source of present-day groundwater in several of the more arid basins. (6) (4) Average annual precipitation The Southwest Principal Aquifers study area contains more than 400 basins that are filled with unconsolidated deposits derived from the adjacent mountains. Differences among the rock types that are the source of the deposits contribute to differences in groundwater quality in the basins.…”

Section: What Types Of Wells Were Sampled and How Might That Affect mentioning

confidence: 99%

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The quality of our Nation's waters: Water quality in basin-fill aquifers of the southwestern United States: Arizona, California, Colorado, Nevada, New Mexico, and Utah, 1993-2009

Thiros¹,

Paul²,

Bexfield³

et al. 2015

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The United States has made major investments in assessing, managing, regulating, and conserving natural resources, such as water and a variety of ecosystems. Sustaining the quality of the Nation's water resources and the health of our diverse ecosystems depends on the availability of sound water-resources data and information to develop effective, science-based policies. Effective management of water resources also brings more certainty and efficiency to important economic sectors. Taken together, these actions lead to immediate and long-term economic, social, and environmental benefits that make a difference to the lives of millions of people (http://water.usgs.gov/nawqa/applications/). Two decades ago, Congress established the U.S. Geological Survey's National Water-Quality Assessment (NAWQA) Program to meet this need. Since then NAWQA has served as a primary source of nationally consistent information on the quality of the Nation's streams and groundwater, on ways in which water quality changes over time, and on the natural features and human activities affecting the quality of streams and groundwater. Objective and reliable data, systematic scientific studies, and models are used to characterize where, when, and why the Nation's water quality is degraded-and what can be done to improve and protect the water for human and ecosystem needs. This information is critical to our future because the Nation faces an increasingly complex and growing need for clean water to support people, economic growth, and healthy ecosystems. For example, NAWQA findings for public-supply wells, which provide water to about 105 million people, showed that 22 percent of source-water samples contained at least one contaminant at levels of potential health concern. Similarly, 23 percent of samples from domestic (or privately owned) wells, which supply untreated water to an additional 43 million people, also had contaminant levels of potential concern. This report is one of a collection of publications that describe water-quality conditions in selected Principal Aquifers of the United States (http://water.usgs.gov/nawqa/studies/praq/). The collection is part of the series "The Quality of Our Nation's Waters," which describes major findings of the NAWQA Program on water-quality issues of regional and national concern and which provides science-based information for assessing and managing the quality of our groundwater resources. Other reports in this series focus on occurrence and distribution of nutrients, pesticides, and volatile organic compounds in streams and groundwater, the effects of contaminants and streamflow alteration on the condition of aquatic communities in streams, and the quality of untreated water from private domestic and public-supply wells.

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Section: What Types Of Wells Were Sampled and How Might That Affect mentioning

confidence: 99%

Section: What Types Of Wells Were Sampled and How Might That Affect mentioning

confidence: 99%

The quality of our Nation's waters: Water quality in basin-fill aquifers of the southwestern United States: Arizona, California, Colorado, Nevada, New Mexico, and Utah, 1993-2009

Thiros¹,

Paul²,

Bexfield³

et al. 2015

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“…This report builds upon individual studies of factors that affect water quality, as summarized in Thiros and others (2010), and synthesis of that information into generalized conceptual models for selected contaminants as described by Bexfield and others (2011). Several natural and human-related factors that affect groundwater quality are represented by datasets compiled by McKinney and Anning (2009) as part of the SWPA study.…”

Section: Purpose and Scopementioning

confidence: 99%

“…Each basin description provides information about various influential factors believed to affect the groundwater quality in that basin, including population, land use, water use, recharge and discharge mechanisms, and flow directions. Data for several of the natural and human-related factors presented in Thiros and others (2010) and Bexfield and others (2011), particularly those factors relating to physiography, population, land use, and water use, are compiled in McKinney and Anning (2009) for all 422 basins within the SWPA study area. Several of the variables compiled by McKinney and Anning (2009) also are used in this report.…”

Section: Southwest Principal Aquifers Studiesmentioning

confidence: 99%

Predicted nitrate and arsenic concentrations in basin-fill aquifers of the Southwestern United States

Anning¹,

Paul²,

McKinney³

et al. 2012

Scientific Investigations Report

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Percentage of basin-fill aquifer model grid cells in the Southwest Principal Aquifers study area that are predicted to exceed the relative background nitrate concentration, by percentage of agricultural and urban land use in the model grid cell ........... 48 12. Standardized importance scores for the prediction and confirmatory random forest classifiers of arsenic concentrations in basin-fill aquifers of the Southwest

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“…As part of the regional analysis activities, digital data sets that represent potential factors affecting water quality were produced by the SWPA study ( fig. 4; McKinney and Anning, 2009). Potential factors such as population, land use, and water use ( fig.…”

Section: Regional Analysismentioning

confidence: 99%

Southwest principal aquifers regional ground-water quality assessment

Anning¹,

Thiros²,

Bexfield³

et al. 2009

Fact Sheet

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The National Water-Quality Assessment (NAWQA) Program of the U.S. Geological Survey is conducting a regional analysis of water quality in the principal aquifers in the southwestern United States. The Southwest Principal Aquifers (SWPA) study is building a better understanding of the susceptibility and vulnerability of basin-fill aquifers in the region to groundwater contamination by synthesizing the baseline knowledge of groundwater quality conditions in 15 basins previously studied by the NAWQA Program (fig. 1). The improved understanding of aquifer susceptibility and vulnerability to contamination (these terms are defined on page 3) is assisting in the development of tools that water managers can use to assess and protect the quality of groundwater resources. The NAWQA Program is performing similar regional investigations for other principal aquifers across the country (Lapham and others, 2005).

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Geospatial data to support analysis of water-quality conditions in basin-fill aquifers in the southwestern United States

Cited by 5 publications

References 3 publications

The quality of our Nation's waters: Water quality in basin-fill aquifers of the southwestern United States: Arizona, California, Colorado, Nevada, New Mexico, and Utah, 1993-2009

The quality of our Nation's waters: Water quality in basin-fill aquifers of the southwestern United States: Arizona, California, Colorado, Nevada, New Mexico, and Utah, 1993-2009

Predicted nitrate and arsenic concentrations in basin-fill aquifers of the Southwestern United States

Southwest principal aquifers regional ground-water quality assessment

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