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Filters Date Types (for Date Range) Contacts U.S. Geological Survey Integrated Modeling & Prediction Division Water Resources Hitt, K.J. Lanfear, K.J. More... Categories pre-SM502.8 (32) Tag Types Theme (67) Place (67) Harvest Set (67) Tag Schemes USGS Thesaurus (66) ISO 19115 Topic Category (64) Geographic Names Information System (66) Geographic Names Information Systems (1) View Results as: JSON ATOM CSV

1980 point population coverage for the Conterminous United States 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. A point coverage was created from the 1980 Master Area Reference File (MARF) of the U.S. Census Bureay. Each point represents the center of a census tract, though some tracts were split. A 1980 population is associated with each point. Populations for 1970, 1982, 1984, and 1985 were inferred from county population data. Tags: Conterminous United States, Housing, NSDI, Population, USGS Science Data Catalog (SDC), All tags... United States, environment, geoscientificInformation, inlandWaters, inlandWaters, Fewer tags Vulnerability of shallow ground water and drinking-water wells to nitrate in the United States: Model of predicted nitrate concentration in shallow, recently recharged ground water -- Input data set for slope (gwava-s_slop) 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 Vulnerability of shallow ground water and drinking-water wells to nitrate in the United States: Model of predicted nitrate concentration in shallow, recently recharged ground water -- Input data set for carbonate rocks (gwava-s_crox) 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 Vulnerability of shallow ground water and drinking-water wells to nitrate in the United States: Model of predicted nitrate concentration in shallow, recently recharged ground water - Model output data set (gwava-s_out) 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 1:2,000,000-scale state boundaries of the conterminous United States 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 coverage is of the state boundaries of the conterminous United States. It was derived from the Digital Line Graph (DLG) files representing the 1:2,000,000-scale map in the National Atlas of the United States. Boundaries United States Tags: Conterminous United States, NSDI, State boundaries of the conterminous United States, USGS Science Data Catalog (SDC), inlandWaters Vulnerability of shallow ground water and drinking-water wells to nitrate in the United States: Model of predicted nitrate concentration in shallow, recently recharged ground water -- Input data set for irrigation tailwater recovery (gwava-s_twre) 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 Vulnerability of shallow ground water and drinking-water wells to nitrate in the United States: Model of predicted nitrate concentration in shallow, recently recharged ground water -- Input data set for fresh surface water withdrawal (gwava-s_swus) 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 MODFLOW-2005 model used to Simulate the Evolution of Fluid Underpressures in the Great Plains, by Incorporation of Tectonic Uplift and Tilting A sequence of nine two-dimensional cross-sectional groundwater models using MODFLOW-2005 was created to study whether underpressures (subhydrostatic heads) in the Paleozoic units underlying the Great Plains of North America are a consequence of Cenozoic uplift of the area. Based on tectonostratigraphic data incorporated into these nine models, we have developed a cumulative uplift history with superimposed periods of deposition and erosion for the Great Plains for the period from 40Ma to the present. Uplift, deposition, and erosion on an 800 kilometer long geologic cross-section extending from northeast Colorado to eastern Kansas is represented in these nine time-stepped geohydrologic models. Sequential solution... Tags: Colorado, Fluid Underpressures, Great Plains, Groundwater, Groundwater Model, All tags... InlandWaters, Kansas, MODFLOW-2005, NSDI, Tectonic Uplift, USGS Science Data Catalog (SDC), environment, geoscientificInformation, inlandWaters, usgsgroundwatermodel, Fewer tags Colorado Plateaus aquifers 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 extent of the Colorado Plateaus aquifers in Colorado, Wyoming, Utah, Arizona, and New Mexico. Tags: NSDI, USGS Science Data Catalog (SDC), Wyoming, aquifer, aquifer extent, All tags... eastern Utah, environment, geoscientificInformation, groundwater, inlandWaters, inlandWaters, northeastern Arizona, northeastern New Mexico, western Colorado, Fewer tags Generalized boundaries of the National Water-Quality Assessment (NAWQA) Study-Unit Investigations in the conterminous United States 1991-2001 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 Vulnerability of shallow ground water and drinking-water wells to nitrate in the United States: Model of predicted nitrate concentration in U.S. ground water used for drinking (simulation depth 50 meters) -- Input data set for semiconsolidated sand aquifers (gwava-dw_semc) 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 Vulnerability of shallow ground water and drinking-water wells to nitrate in the United States: Model of predicted nitrate concentration in U.S. ground water used for drinking (simulation depth 50 meters) -- Input data set for irrigation tailwater recovery (gwava-dw_twre) 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 Vulnerability of shallow ground water and drinking-water wells to nitrate in the United States: Model of predicted nitrate concentration in shallow, recently recharged ground water -- Input data set for histosols (gwava-s_hist) 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 Vulnerability of shallow ground water and drinking-water wells to nitrate in the United States: Model of predicted nitrate concentration in U.S. ground water used for drinking (simulation depth 50 meters) -- Input data set for Dunne overland flow (gwava-dw_dun) 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 Vulnerability of shallow ground water and drinking-water wells to nitrate in the United States: Model of predicted nitrate concentration in shallow, recently recharged ground water -- Input data set for water input (gwava-s_wtin) 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 Vulnerability of shallow ground water and drinking-water wells to nitrate in the United States: Model of predicted nitrate concentration in shallow, recently recharged ground water -- Input data set for population density (gwava-s_popd) 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 Vulnerability of shallow ground water and drinking-water wells to nitrate in the United States: Model of predicted nitrate concentration in U.S. ground water used for drinking (simulation depth 50 meters) -- Input data set for confined manure (gwava-dw_conf) 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 Vulnerability of shallow ground water and drinking-water wells to nitrate in the United States: Model of predicted nitrate concentration in shallow, recently recharged ground water -- Input data set for farm fertilizer (gwava-s_ffer) 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 Alaska unconsolidated-deposit aquifer 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 extent of the Unconsolidated-deposit aquifer in Alaska. Tags: Alaska, NSDI, USGS Science Data Catalog (SDC), aquifer, aquifer extent, All tags... geoscientificInformation, groundwater, inland waters, inland waters, Fewer tags Climate Divisions 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 climate divisions from the National Climatic Data Center. climate Tags: Conterminous United States, NOAA Climate Divisions, NSDI, USGS Science Data Catalog (SDC), environment, All tags... geoscientificInformation, inlandWaters, inlandWaters, Fewer tags 1 2 3 4 »