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These data were released prior to the October 1, 2016 effective date for the USGS’s policy dictating the review, approval, and release of scientific data as referenced in USGS Survey Manual Chapter 502.8 Fundamental Science Practices: Review and Approval of Scientific Data for Release. This data set represents soil surface slope, in percent times 1000, in the conterminous United States. The data set was used as an input data layer for a national model to predict nitrate concentration in shallow ground water. Nolan and Hitt (2006) developed two national models to predict contamination of ground water by nonpoint sources of nitrate. The nonlinear approach to national-scale Ground-WAter Vulnerability Assessment (GWAVA)...
Tags: Conterminous United States,
Ground water,
Ground water contamination,
Ground water pollution,
Ground water susceptibility, All tags...
NAWQA,
NSDI,
National Water-Quality Assessment Program,
Nitrate,
Nitrate concentration,
Nonlinear model,
Nutrients,
Slope,
USGS Science Data Catalog (SDC),
environment,
geoscientificInformation,
inlandWaters,
inlandWaters, Fewer tags
These data were released prior to the October 1, 2016 effective date for the USGS’s policy dictating the review, approval, and release of scientific data as referenced in USGS Survey Manual Chapter 502.8 Fundamental Science Practices: Review and Approval of Scientific Data for Release. This data set represents the presence or absence of Valley and Ridge carbonate rocks in the conterminous United States. The data set was used as an input data layer for a national model to predict nitrate concentration in shallow ground water. Nolan and Hitt (2006) developed two national models to predict contamination of ground water by nonpoint sources of nitrate. The nonlinear approach to national-scale Ground-WAter Vulnerability...
Tags: Carbonate rocks,
Conterminous United States,
Ground water,
Ground water contamination,
Ground water pollution, All tags...
Ground water susceptibility,
NAWQA,
NSDI,
National Water-Quality Assessment Program,
Nitrate,
Nitrate concentration,
Nonlinear model,
Nutrients,
USGS Science Data Catalog (SDC),
environment,
geoscientificInformation,
inlandWaters,
inlandWaters, Fewer tags
These data were released prior to the October 1, 2016 effective date for the USGS’s policy dictating the review, approval, and release of scientific data as referenced in USGS Survey Manual Chapter 502.8 Fundamental Science Practices: Review and Approval of Scientific Data for Release. This data set represents predicted nitrate concentration in shallow, recently recharged ground water, in milligrams per liter, in the conterminous United States, and was generated by a national nonlinear regression model based on 16 input parameters. Nolan and Hitt (2006) developed two national models to predict contamination of ground water by nonpoint sources of nitrate. The nonlinear approach to national-scale Ground-WAter Vulnerability...
Tags: Conterminous United States,
Ground water,
Ground water contamination,
Ground water pollution,
Ground water susceptibility, All tags...
NAWQA,
NSDI,
National Water-Quality Assessment Program,
Nitrate,
Nitrate concentration,
Nonlinear model,
Nutrients,
USGS Science Data Catalog (SDC),
environment,
geoscientificInformation,
inlandWaters,
inlandWaters, Fewer tags
These data were released prior to the October 1, 2016 effective date for the USGS’s policy dictating the review, approval, and release of scientific data as referenced in USGS Survey Manual Chapter 502.8 Fundamental Science Practices: Review and Approval of Scientific Data for Release. This data set represents the amount of fresh surface water withdrawal for irrigation, in megaliters per day, in the conterminous United States. The data set was used as an input data layer for a national model to predict nitrate concentration in shallow ground water. Nolan and Hitt (2006) developed two national models to predict contamination of ground water by nonpoint sources of nitrate. The nonlinear approach to national-scale...
Tags: Conterminous United States,
Fresh surface water withdrawal,
Ground water,
Ground water contamination,
Ground water pollution, All tags...
Ground water susceptibility,
Irrigation water use,
NAWQA,
NSDI,
National Land Cover Data,
National Water-Quality Assessment Program,
Nitrate,
Nitrate concentration,
Nonlinear model,
Nutrients,
USGS Science Data Catalog (SDC),
environment,
geoscientificInformation,
inlandWaters,
inlandWaters, Fewer tags
These data were released prior to the October 1, 2016 effective date for the USGS’s policy dictating the review, approval, and release of scientific data as referenced in USGS Survey Manual Chapter 502.8 Fundamental Science Practices: Review and Approval of Scientific Data for Release. This data set represents the area of National Resources Inventory irrigation system, tailwater recovery conservation practice, in square kilometers, in the conterminous United States. The data set was used as an input data layer for a national model to predict nitrate concentration in shallow ground water. Nolan and Hitt (2006) developed two national models to predict contamination of ground water by nonpoint sources of nitrate....
Tags: Conterminous United States,
Ground water,
Ground water contamination,
Ground water pollution,
Ground water susceptibility, All tags...
Irrigation tailwater recovery,
NAWQA,
NRI,
NSDI,
National Land Cover Data,
National Resources Inventory,
National Water-Quality Assessment Program,
Nitrate,
Nitrate concentration,
Nonlinear model,
Nutrients,
USGS Science Data Catalog (SDC),
environment,
geoscientificInformation,
inlandWaters,
inlandWaters, Fewer tags
These data were released prior to the October 1, 2016 effective date for the USGS’s policy dictating the review, approval, and release of scientific data as referenced in USGS Survey Manual Chapter 502.8 Fundamental Science Practices: Review and Approval of Scientific Data for Release. This data set represents the average annual nitrogen input from confined animal manure, 1992 and 1997, in kilograms per hectare, in the conterminous United States. The data set was used as an input data layer for a national model to predict nitrate concentration in ground water used for drinking. Nolan and Hitt (2006) developed two national models to predict contamination of ground water by nonpoint sources of nitrate. The nonlinear...
Tags: Confined animal manure,
Conterminous United States,
Drinking water,
Ground water,
Ground water contamination, All tags...
Ground water pollution,
Ground water susceptibility,
NAWQA,
NSDI,
National Land Cover Data,
National Water-Quality Assessment Program,
Nitrate,
Nitrate concentration,
Nonlinear model,
Nutrients,
USGS Science Data Catalog (SDC),
environment,
geoscientificInformation,
inlandWaters,
inlandWaters, Fewer tags
These data were released prior to the October 1, 2016 effective date for the USGS’s policy dictating the review, approval, and release of scientific data as referenced in USGS Survey Manual Chapter 502.8 Fundamental Science Practices: Review and Approval of Scientific Data for Release. This data set represents saturation overland flow estimated by TOPMODEL, in percent of streamflow, in the conterminous United States. The data set was used as an input data layer for a national model to predict nitrate concentration in ground water used for drinking. Nolan and Hitt (2006) developed two national models to predict contamination of ground water by nonpoint sources of nitrate. The nonlinear approach to national-scale...
Tags: Conterminous United States,
Drinking water,
Dunne overland flow,
Ground water,
Ground water contamination, All tags...
Ground water pollution,
Ground water susceptibility,
NAWQA,
NSDI,
National Water-Quality Assessment Program,
Nitrate,
Nitrate concentration,
Nonlinear model,
Nutrients,
USGS Science Data Catalog (SDC),
environment,
geoscientificInformation,
inlandWaters,
inlandWaters, Fewer tags
These data were released prior to the October 1, 2016 effective date for the USGS’s policy dictating the review, approval, and release of scientific data as referenced in USGS Survey Manual Chapter 502.8 Fundamental Science Practices: Review and Approval of Scientific Data for Release. This data set represents the presence or absence of semiconsolidated sand aquifers in the conterminous United States. The data set was used as an input data layer for a national model to predict nitrate concentration in ground water used for drinking. Nolan and Hitt (2006) developed two national models to predict contamination of ground water by nonpoint sources of nitrate. The nonlinear approach to national-scale Ground-WAter Vulnerability...
Tags: Conterminous United States,
Drinking water,
Ground water,
Ground water contamination,
Ground water pollution, All tags...
Ground water susceptibility,
NAWQA,
NSDI,
National Water-Quality Assessment Program,
Nitrate,
Nitrate concentration,
Nonlinear model,
Nutrients,
Semiconsolidated sand aquifers,
USGS Science Data Catalog (SDC),
environment,
geoscientificInformation,
inlandWaters,
inlandWaters, Fewer tags
These data were released prior to the October 1, 2016 effective date for the USGS’s policy dictating the review, approval, and release of scientific data as referenced in USGS Survey Manual Chapter 502.8 Fundamental Science Practices: Review and Approval of Scientific Data for Release. This data set represents the area of National Resources Inventory irrigation system, tailwater recovery conservation practice, in square kilometers, in the conterminous United States. The data set was used as an input data layer for a national model to predict nitrate concentration in ground water used for drinking. Nolan and Hitt (2006) developed two national models to predict contamination of ground water by nonpoint sources of...
Tags: Conterminous United States,
Drinking water,
Ground water,
Ground water contamination,
Ground water pollution, All tags...
Ground water susceptibility,
Irrigation tailwater recovery,
NAWQA,
NRI,
NSDI,
National Land Cover Data,
National Resources Inventory,
National Water-Quality Assessment Program,
Nitrate,
Nitrate concentration,
Nonlinear model,
Nutrients,
USGS Science Data Catalog (SDC),
environment,
geoscientificInformation,
inlandWaters,
inlandWaters, Fewer tags
These data were released prior to the October 1, 2016 effective date for the USGS’s policy dictating the review, approval, and release of scientific data as referenced in USGS Survey Manual Chapter 502.8 Fundamental Science Practices: Review and Approval of Scientific Data for Release. This data set represents the amount of histosols soil taxonomic order, in percent, in the conterminous United States. The data set was used as an input data layer for a national model to predict nitrate concentration in shallow ground water. Nolan and Hitt (2006) developed two national models to predict contamination of ground water by nonpoint sources of nitrate. The nonlinear approach to national-scale Ground-WAter Vulnerability...
Tags: Conterminous United States,
Ground water,
Ground water contamination,
Ground water pollution,
Ground water susceptibility, All tags...
Histosols,
NAWQA,
NSDI,
National Water-Quality Assessment Program,
Nitrate,
Nitrate concentration,
Nonlinear model,
Nutrients,
USGS Science Data Catalog (SDC),
environment,
geoscientificInformation,
inlandWaters,
inlandWaters, Fewer tags
These data were released prior to the October 1, 2016 effective date for the USGS’s policy dictating the review, approval, and release of scientific data as referenced in USGS Survey Manual Chapter 502.8 Fundamental Science Practices: Review and Approval of Scientific Data for Release. This data set represents 1990 block group population density, in people per square kilometer, in the conterminous United States. The data set was used as an input data layer for a national model to predict nitrate concentration in shallow ground water. Nolan and Hitt (2006) developed two national models to predict contamination of ground water by nonpoint sources of nitrate. The nonlinear approach to national-scale Ground-WAter Vulnerability...
Tags: Conterminous United States,
Ground water,
Ground water contamination,
Ground water pollution,
Ground water susceptibility, All tags...
NAWQA,
NSDI,
National Water-Quality Assessment Program,
Nitrate,
Nitrate concentration,
Nonlinear model,
Nutrients,
Population density,
USGS Science Data Catalog (SDC),
environment,
geoscientificInformation,
inlandWaters,
inlandWaters, Fewer tags
These data were released prior to the October 1, 2016 effective date for the USGS’s policy dictating the review, approval, and release of scientific data as referenced in USGS Survey Manual Chapter 502.8 Fundamental Science Practices: Review and Approval of Scientific Data for Release. This data set represents "water input," the ratio of the total area of irrigated land to precipitation, in square kilometers per centimeter, in the conterminous United States. The data set was used as an input data layer for a national model to predict nitrate concentration in shallow ground water. Nolan and Hitt (2006) developed two national models to predict contamination of ground water by nonpoint sources of nitrate. The nonlinear...
Tags: Conterminous United States,
Ground water,
Ground water contamination,
Ground water pollution,
Ground water susceptibility, All tags...
Irrigated land,
NAWQA,
NSDI,
National Land Cover Data,
National Water-Quality Assessment Program,
Nitrate,
Nitrate concentration,
Nonlinear model,
Nutrients,
Precipitation,
USGS Science Data Catalog (SDC),
environment,
geoscientificInformation,
inlandWaters,
inlandWaters, Fewer tags
These data were released prior to the October 1, 2016 effective date for the USGS’s policy dictating the review, approval, and release of scientific data as referenced in USGS Survey Manual Chapter 502.8 Fundamental Science Practices: Review and Approval of Scientific Data for Release. This is a GENERALIZED version of the boundaries and codes used for the U.S. Geological Survey's National Water-Quality Assessment (NAWQA) Program Study-Unit investigations in the conterminous United States, excluding the High Plains Regional Ground-Water Study. The data set represents the areas studied during the first decade of the NAWQA Program, from 1991-2001 ("cycle 1"). The coverage is intended only for drawing ILLUSTRATIONS,...
Tags: Aquifer system,
Conterminous United States,
Ground water,
NAWQA,
NSDI, All tags...
National Water-Quality Assessment,
River basin,
Study Unit boundary,
Surface water,
USGS Science Data Catalog (SDC),
Water quality,
environment,
geoscientificInformation,
inlandWaters,
inlandWaters, Fewer tags
These data were released prior to the October 1, 2016 effective date for the USGS’s policy dictating the review, approval, and release of scientific data as referenced in USGS Survey Manual Chapter 502.8 Fundamental Science Practices: Review and Approval of Scientific Data for Release. This data set represents the average annual nitrogen input from commercial fertilizer applied to agricultural lands, 1992-2001, in kilograms per hectare, in the conterminous United States. The data set was used as an input data layer for a national model to predict nitrate concentration in shallow ground water. Nolan and Hitt (2006) developed two national models to predict contamination of ground water by nonpoint sources of nitrate....
Tags: Conterminous United States,
Farm Fertilizer,
Ground water,
Ground water contamination,
Ground water pollution, All tags...
Ground water susceptibility,
NAWQA,
NSDI,
National Land Cover Data,
National Water-Quality Assessment Program,
Nitrate,
Nitrate concentration,
Nonlinear model,
Nutrients,
USGS Science Data Catalog (SDC),
environment,
geoscientificInformation,
inlandWaters,
inlandWaters, Fewer tags
These data were released prior to the October 1, 2016 effective date for the USGS’s policy dictating the review, approval, and release of scientific data as referenced in USGS Survey Manual Chapter 502.8 Fundamental Science Practices: Review and Approval of Scientific Data for Release. This is a GENERALIZED version of the boundaries and codes used for the U.S. Geological Survey's National Water-Quality Assessment (NAWQA) Program Study-Unit investigations in the conterminous United States, excluding the High Plains Regional Ground-Water Study. The data set represents the areas to be studied during the second decade of the NAWQA Program, from 2001-2012 ("cycle 2"). The coverage is intended only for drawing ILLUSTRATIONS,...
Tags: Aquifer system,
Ground water,
NAWQA,
NSDI,
National Water-Quality Assessment, All tags...
River basin,
Study Unit boundary,
Surface water,
USGS Science Data Catalog (SDC),
Water quality,
conterminous United States,
environment,
geoscientificInformation,
inlandWaters,
inlandWaters, Fewer tags
These data were released prior to the October 1, 2016 effective date for the USGS’s policy dictating the review, approval, and release of scientific data as referenced in USGS Survey Manual Chapter 502.8 Fundamental Science Practices: Review and Approval of Scientific Data for Release. This data set represents predicted nitrate concentration in ground water used for drinking, in milligrams per liter, in the conterminous United States, and was generated by a national nonlinear regression model based on 14 input parameters. Nolan and Hitt (2006) developed two national models to predict contamination of ground water by nonpoint sources of nitrate. The nonlinear approach to national-scale Ground-WAter Vulnerability...
Tags: Conterminous United States,
Drinking water,
Ground water,
Ground water contamination,
Ground water pollution, All tags...
Ground water susceptibility,
NAWQA,
NSDI,
National Water-Quality Assessment Program,
Nitrate,
Nitrate concentration,
Nonlinear model,
Nutrients,
USGS Science Data Catalog (SDC),
environment,
geoscientificInformation,
inlandWaters,
inlandWaters, Fewer tags
These data were released prior to the October 1, 2016 effective date for the USGS’s policy dictating the review, approval, and release of scientific data as referenced in USGS Survey Manual Chapter 502.8 Fundamental Science Practices: Review and Approval of Scientific Data for Release. This data set represents the percent of woody wetlands and emergent herbaceous wetlands land cover in the conterminous United States. The data set was used as an input data layer for a national model to predict nitrate concentration in shallow ground water. Nolan and Hitt (2006) developed two national models to predict contamination of ground water by nonpoint sources of nitrate. The nonlinear approach to national-scale Ground-WAter...
Tags: Conterminous United States,
Ground water,
Ground water contamination,
Ground water pollution,
Ground water susceptibility, All tags...
NAWQA,
NSDI,
National Land Cover Data,
National Water-Quality Assessment Program,
Nitrate,
Nitrate concentration,
Nonlinear model,
Nutrients,
USGS Science Data Catalog (SDC),
Wetlands,
environment,
geoscientificInformation,
inlandWaters,
inlandWaters, Fewer tags
These data were released prior to the October 1, 2016 effective date for the USGS’s policy dictating the review, approval, and release of scientific data as referenced in USGS Survey Manual Chapter 502.8 Fundamental Science Practices: Review and Approval of Scientific Data for Release. This is a coverage of the boundaries and codes used for the U.S. Geological Survey's National Water-Quality Assessment (NAWQA) Program Study-Unit investigations in the conterminous United States, excluding the High Plains Regional Ground-Water Study. The data set represents the areas to be studied during the second cycle of the NAWQA Program, from 2001-2012 ("cycle 2").
Tags: Aquifer system,
Conterminous United States,
Ground water,
NAWQA,
NSDI, All tags...
National Water-Quality Assessment Program,
River basin,
Surface water,
USGS Science Data Catalog (SDC),
Water quality,
environment,
geoscientificInformation,
inlandWaters,
inlandWaters, Fewer tags
These data were released prior to the October 1, 2016 effective date for the USGS’s policy dictating the review, approval, and release of scientific data as referenced in USGS Survey Manual Chapter 502.8 Fundamental Science Practices: Review and Approval of Scientific Data for Release. This data set represents the presence or absence of poorly sorted glacial till east of the Rocky Mountains in the conterminous United States. The data set was used as an input data layer for a national model to predict nitrate concentration in ground water used for drinking. Nolan and Hitt (2006) developed two national models to predict contamination of ground water by nonpoint sources of nitrate. The nonlinear approach to national-scale...
Tags: Conterminous United States,
Ddrinking water,
Glacial till,
Ground water,
Ground water contamination, All tags...
Ground water pollution,
Ground water susceptibility,
NAWQA,
NSDI,
National Water-Quality Assessment Program,
Nitrate,
Nitrate concentration,
Nonlinear model,
Nutrients,
USGS Science Data Catalog (SDC),
environment,
geoscientificInformation,
inlandWaters,
inlandWaters, Fewer tags
These data were released prior to the October 1, 2016 effective date for the USGS’s policy dictating the review, approval, and release of scientific data as referenced in USGS Survey Manual Chapter 502.8 Fundamental Science Practices: Review and Approval of Scientific Data for Release. This data set represents the presence or absence of sandstone and carbonate rock aquifers in the conterminous United States. The data set was used as an input data layer for a national model to predict nitrate concentration in ground water used for drinking. Nolan and Hitt (2006) developed two national models to predict contamination of ground water by nonpoint sources of nitrate. The nonlinear approach to national-scale Ground-WAter...
Tags: Conterminous United States,
Drinking water,
Ground water,
Ground water contamination,
Ground water pollution, All tags...
Ground water susceptibility,
NAWQA,
NSDI,
National Water-Quality Assessment Program,
Nitrate,
Nitrate concentration,
Nonlinear model,
Nutrients,
Sandstone and carbonate rocks,
USGS Science Data Catalog (SDC),
environment,
geoscientificInformation,
inlandWaters,
inlandWaters, Fewer tags
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