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Data for depth of groundwater used for drinking-water supplies in the United States This data release includes grids representing the depth and thickness of drinking-water withdrawal zones, polygons of hydrogeologic settings, an inventory of sources of well construction data, and summaries of data comparisons used to assess the depth of groundwater used for drinking-water supplies in the United States. Well construction data sources are documented in Table1_DataSources.xlsx. Data comparisons using the Mann-Whitney test to assess similarity between hydrogeologic settings were used to justify combining data where they were sparse (compare_neighbors_all_domestic.txt and compare_neighbors_all_public.txt). Water-supply-well depth varies geographically by water use and the type of well, which illustrates... Categories: Data, Data Release - Revised; Types: Map Service, OGC WFS Layer, OGC WMS Layer, OGC WMS Service; Tags: Cycle 3, Hydrology, NAWQA, USGS Science Data Catalog (SDC), United States, All tags... Water Quality, Water Resources, aquifers, domestic well water use, drinking water use, groundwater, public supply water use, water quality, Fewer tags Data for the Estimation of Regional Flow-Duration Curves for Indiana and Illinois (ver. 2.0, February 2021) This data release is currently being revised and is temporarily unavailable. Digital datasets were used to develop basin characteristics whose values are used in multiple regression equations and tested for the use in predicting flow-duration curves (FDCs) in ungaged areas of Illinois and Indiana. Several basin characteristics are easily derived from StreamStats (https://streamstats.usgs.gov/ss/) basin delineations themselves, such as basin area and basin centroid. Other basin characteristics require ancillary datasets as input. The data provided through this data release are those data that have been collected, tested, and ultimately selected as a basis for FDC development. These include Soil Components (Available... Categories: Data Release - Revised; Tags: Basin characteristic, Flow-duration curve, Hydrology, Illinois, Indiana, All tags... USGS Science Data Catalog (SDC), Water Resources, drainage basins, stream-gage measurement, streamflow, watershed, Fewer tags Data for the Estimation of Regional Flow-Duration Curves for Indiana and Illinois (ver. 3.0, December 2021) Digital datasets were used to develop basin characteristics values that are used in multiple regression equations and tested for the use in predicting flow-duration curves (FDCs) in ungaged areas of Illinois and Indiana. Several basin characteristics are easily derived from StreamStats basin delineations, such as basin area and basin centroid (https://streamstats.usgs.gov/ss/). Other basin characteristics require ancillary datasets as input. The data provided through this data release are those data that have been collected, tested, and ultimately selected as a basis for FDC development. These include Soil Components (Available Water Capacity, Drainage Index, and Permeability); PRISM 3-Month Average Precipitation;... Categories: Data Release - Revised; Tags: Basin characteristic, Flow-duration curve, Illinois, Indiana, USGS Science Data Catalog (SDC), All tags... drainage basins, stream-gage measurement, streamflow, watershed, Fewer tags Data Release for Secondary Hydrogeologic Regions of the Conterminous United States (ver. 2.0, June 2022) The U.S. Geological Survey (USGS) previously identified 62 Principal Aquifers (PAs) in the U.S., with 57 located in the conterminous states. The USGS characterized areas outside of PAs as “other rocks;” other rocks account for about 40% of the area of the conterminous states. This paper subdivides the large area identified as other rocks into Secondary Hydrogeologic Regions (SHRs). SHRs are defined as areas of other rock within which the rocks are of comparable geologic age, lithology, and relationship to the presence or absence of underling PAs or overlying glacial deposits. A total of 69 SHRs were identified. SHRs were identified in two phases. In the first phase, Other Rock Regions (ORRs) were defined as regions... Categories: Data Release - Revised; Tags: Aquifers, Classification, Confining Layers, Groundwater, Hydrogeology, All tags... NAWQA, National Water Quality Program, Regional-scale, USGS Science Data Catalog (SDC), United States, Water quality, cycle 3, Fewer tags