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Data used to model and map arsenic concentration exceedances in private wells throughout the conterminous United States for human health studies This data release contains data used to develop models and maps that estimate the probabilities of exceeding various thresholds of arsenic concentrations in private domestic wells throughout the conterminous United States. Three boosted regression tree (BRT) models were developed separately to estimate the probability of private well arsenic concentrations exceeding 1, 5, and 10 micrograms per liter (µg/L). A random forest (RF) model was developed to estimate the most probable arsenic concentration category (≤5, >5 to ≤10, or >10 µg/L). The models use arsenic concentration data from private domestic wells located throughout the conterminous United States and independent variables that are available as geospatial... Categories: Data; Tags: Environmental Health, Geochemistry, Hydrology, USGS Science Data Catalog (SDC), United States, All tags... Water Quality, arsenic, drinking water use, environment, environmental health (human), geoscientificInformation, groundwater quality, health, machine learning models, private wells, Fewer tags Data Layers for the National Hydrologic Model, version 1.1 This U.S. Geological Survey (USGS) metadata release consists of 17 different spatial layers in GeoTIFF format. They are: 1) average water capacity (AWC.zip), 2) percent sand (Sand.zip), 3) percent silt (Silt.zip), 4) percent clay (Clay.zip), 5) soil texture (TEXT_PRMS.zip), 6) land use/land cover (LULC.zip), 7) snow values (Snow.zip), 8) summer rain values (SRain.zip), 9) winter rain values (WRain.zip), 10) leaf presence values (keep.zip), 11) leaf loss values (loss.zip), 12) percent tree canopy (CNPY.zip), 13) percent impervious surface (Imperv.zip), 14) snow depletion curve numbers (Snow.zip), 15) rooting depth (RootDepth.zip), 16) permeability values (Lithology_exp_Konly_Project.zip), and 17) water bodies. All... Categories: Data; Tags: Canada, average water capacity, boundaries, conterminous United States of America, geographic information systems (GIS), All tags... geoscientificInformation, hydrologic modeling, hydrologic response Units (HRUs), inLandWaters, interception, land cover, leaf loss, leaf presence, percent clay, percent sand, percent silt, Fewer tags National Hydrologic Model's United States-Canada Transboundary Geospatial Fabric Parameter Database This metadata record documents a set of 118 comma delimited files and a data dictionary describing the inputs for the U.S. Geological Survey Precipitation Runoff Modeling System (PRMS) which is used to drive the National Hydrologic Model (NHM) for the United States-Canada transboundary domain. The National Hydrologic Model database contains parameters for hydrologic response units (HRUs) and stream segments needed to run the NHM. These parameters are generated using python scripts to process input datasets such as digital elevation models, soil maps, and land cover classifications. Many of the parameters were left at their default model value as they would need to be calibrated as part of the PRMS model development... Categories: Data; Tags: Canada, National Hydrologic Model, United States, environment, farming, All tags... health, hydrologic parameters, inlandWaters, watershed modeling, Fewer tags Geospatial Fabric for National Hydrologic Modeling, version 1.1 This U.S. Geological Survey (USGS) data release consists of two hydrographic datasets with spatial modeling units, two sets of spatial data consistent with the National Hydrologic Model (NHM) Geospatial Fabric for National Hydrologic Modeling (abbreviated within this document as GFv1, Viger and Bock, 2014), and a database of 118 parameters used to run the NHM . These datasets are found as subpages to this landing page as 1) the GIS (geographic information system) features of the United States-Canada Transboundary Geospatial Fabric (TGF, added 08/04/2020), 2) the GIS features of the Geospatial Fabric v1.1 (GFv1.1 or v1_1, added 08/04/2020) which is an update to the GF and includes the TGF, 3) Topographic derivative... Categories: Data, Data Release - Revised; Tags: Canada, Geographic Information Systems, Hydrologic Response Units, Hydrologic modeling, Points of Interest, All tags... Routing Network, USGS Science Data Catalog (SDC), United States, geoscientificInformation, inlandWaters, Fewer tags GIS Features of the Geospatial Fabric for the National Hydrologic Model, version 1.1 The Geospatial Fabric version 1.1 (GFv1.1 or v1_1) is a dataset of spatial modeling units covering the conterminous United States (CONUS) and most major river basins that flow in from Canada. The GFv1.1 is an update to the original Geospatial Fabric (GFv1, Viger and Bock, 2014) for the National Hydrologic Modeling (NHM). Analogous to the GFv1, the GFv1.1 described here includes the following vector feature classes: points of interest (POIs_v1_1), a stream network (nsegment_v1_1), and hydrologic response units (nhru_v1_1), with several additional ancillary tables. These data are contained within the Environmental Systems Research Institute (ESRI) geodatabase format (GFv1.1.gdb). Categories: Data; Types: Map Service, OGC WFS Layer, OGC WMS Layer, OGC WMS Service; Tags: Canada, Geographic Information Systems, Hydrologic Response Units, Hydrologic modeling, Points of Interest, All tags... Routing Network, United States, geoscientificInformation, inlandWaters, Fewer tags GIS Features of the Transboundary Geospatial Fabric (TGF) The Transboundary Geospatial Fabric (TGF) is a dataset of spatial modeling units consistent with the Geospatial Fabric for National Hydrologic Modeling (abbreviated within this document as GFv1, Viger and Bock, 2014). These features were derived from National Hydrography Dataset Plus High Resolution data (NHDPlus HR, U.S. Geological Survey [USGS], 2018) in the following conterminous United States (CONUS) - Canada transboundary four-digit Hydrologic Units (HUC4): 0101, 0105, 0108, 0901, 0902, 0903, 0904, 1005, 1006, 1701, 1702, and 1711. The data described here include the following vector feature classes: points of interest (POIs), a stream network (nsegment), major waterbodies (waterbodies), and hydrologic response... Types: Map Service, OGC WFS Layer, OGC WMS Layer, OGC WMS Service; Tags: Canada, Geographic Information Systems, Hydrologic Response Unit, Hydrologic modeling, Points of Interest, All tags... Routing Network, United States, geoscientificInformation, inlandWaters, Fewer tags Testing data set for independent analysis of New Hampshire arsenic model This data release contains a table of measured arsenic concentrations and associated model input variables used to test existing multivariate logistic regression models that predict the probabilities of arsenic concentrations exceeding threshold values of 1, 5, and 10 micrograms per liter in bedrock aquifers of New Hampshire. Location data are censored to the county level. Categories: Data; Tags: Arsenic, Drinking Water, Mathematical Modeling, New Hampshire, Spatial Analysis, All tags... USGS Science Data Catalog (SDC), Water Quality, Water Quality, Fewer tags Data and model archive used to model and map lithium concentrations in groundwater sources of drinking water in the conterminous United States This data release contains data used to develop models and maps that estimate the occurrence of lithium in groundwater used as drinking water throughout the conterminous United States. An extreme gradient boosting model was developed to estimate the most probable lithium concentration category (≤4, >4 to ≤10, >10 to ≤30, or >30 µg/L). The model uses lithium concentration data from wells located throughout the conterminous United States and predictor variables that are available as geospatial data. The model is included in this data release in the zipped folder named Model_Archive and was used to produce maps that are also included in this data release. The model input data (predictor variables) that were used to... Categories: Data; Tags: Environmental Health, USGS Science Data Catalog (SDC), United States, Water Quality, environment, All tags... groundwater quality, health, lithium, Fewer tags U.S. Streamflow Drought During the Last Century: annual drought and low flow metrics, annual climate, and trends for the periods 1921-, 1951- and 1981-2020 This dataset contains annual flow metrics quantifying drought and low streamflows for USGS GAGES-2 gages in the contiguous U.S. satisfying data completeness checks for the periods 1921-2020, 1951-2020, and 1981-2020. The dataset also contains annual climate variables from the USGS Monthly Water Balance Model (MWBM). The dataset provides trend analysis outputs for annual drought and low flow metrics for the periods 1921-2020, 1951-2020, and 1981-2020. Finally, we include six R language code files that were used to create the values included in this release as summarized in the process step section. Categories: Data; Tags: NCCWSC, USGS Science Data Catalog (SDC), USGS:618460d9d34ec04fc9c00082, United States, biota, All tags... droughts, streamflow, surface water (non-marine), water supply and demand, watershed management, Fewer tags Topographic derivative datasets for the United States-Canada transboundary Geospatial Fabric This U.S. Geological Survey (USGS) data release record consists of topographic data themes that cover the United States-Canada Transboundary Geospatial Fabric (TGF) domain. The 30-meter (m) raster data sets included under Topographic Derivatives are: 1) digital elevation (dem.tif) , 2) topographic wetness index (TWI, twi100X.tif) ,3) slope (rise over run, slope100X.tif), 4) aspect (asp100X.tif), and flow direction (fdr.tif). In some instances, values were multiplied by 100 and converted from double precision to integer format to reduce file sizes. All file formats are in GeoTIFF (Geographic Tagged Imaged Format). Tags: Canada, Hydrologic modeling, United States, aspect, boundaries, All tags... digital elevation models, elevation, elevation, geographic information systems (GIS), hydrologic response units (HRUs), inlandWaters, slope, topographic wetness index, Fewer tags