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Probability of nitrate concentrations exceeding multiple thresholds in shallow groundwater, Mid-Atlantic Region of the United States Probability of nitrate concentrations exceeding multiple thresholds in shallow groundwater, Mid-Atlantic Region of the United States
This data release consists of rasters representing the probability of exceeding multiple thresholds of nitrate in shallow groundwater for the Mid-Atlantic region of the United States. Each raster represents the results from multiple spatial-probability models that were developed using U.S. Geological Survey water-quality data in conjunction with geographic data such as land cover...
Data from Decadal Change in Groundwater Quality Web Site, 1988-2021 Data from Decadal Change in Groundwater Quality Web Site, 1988-2021
Evaluating Decadal Changes in Groundwater Quality: Groundwater-quality data were collected from 5,000 wells between 1988-2001 (first decadal sampling event) by the National Water-Quality Assessment Project. Samples are collected in groups of 20-30 wells with similar characteristics called networks. About 1,500 of these wells in 67 networks were sampled again approximately 10 years later...
Central Valley Hydrologic Model version 2 (CVHM2): Model Setup Files Central Valley Hydrologic Model version 2 (CVHM2): Model Setup Files
The model setup of the updated Central Valley Hydrologic Model (CVHM2) is similar to the original Central Valley Hydrologic Model (CVHM). The differences in the model setup are described here as either model discretization, tidal influence, or drain flow. For model discretization, CVHM2 has 13 layers compared to 10 in CVHM. Tidal data for the San Francisco Bay and its influence on the...
Shapefiles of hydrogeologic unit extents and top-surface altitude contours used in the revised hydrogeologic framework for the Virginia Coastal Plain Southwest of the James River Shapefiles of hydrogeologic unit extents and top-surface altitude contours used in the revised hydrogeologic framework for the Virginia Coastal Plain Southwest of the James River
A revision to the hydrogeologic framework of the Virginia coastal plain southwest of the James River was developed by USGS during 2019-2021. This revision includes modifications to existing understanding of the groundwater system in Prince George, Surry, Sussex, Isle of Wight, and Southampton counties and the cities of Franklin and Suffolk in southeast Virginia. This USGS data release...
Digital database of the previously published Geologic maps and cross sections showing configurations of bedrock surfaces, Broken Bow 1 degree x 2 degree quadrangle, east-central Nebraska Digital database of the previously published Geologic maps and cross sections showing configurations of bedrock surfaces, Broken Bow 1 degree x 2 degree quadrangle, east-central Nebraska
This digital data release contains spatial datasets of bedrock geology, volcanic ash bed locations, test hole locations, bedrock outcrops, and structure contours of the top of bedrock and the base of the Ogallala Group from a previously published map (Souders, 2000). The GeologicMap feature dataset contains separate feature classes for the Ogallala Group map unit (ContactsAndFaults and
United States Documented Unplugged Orphaned Oil and Gas Well Dataset United States Documented Unplugged Orphaned Oil and Gas Well Dataset
The United States Documented Unplugged Orphaned Oil and Gas Well (DOW) dataset contains 117,672 wells in 27 states. The definition of an orphaned oil or gas well varies across data sources; the dataset includes oil or gas wells where the state indicates that the well is an unplugged orphan, or the following criteria are met: 1) no production for an average of 12 months (6 to 24 months...