This data set represents the extent of the Arbuckle-Simpson aquifer in Oklahoma.

This data set represents the extent of the Blaine aquifer in Texas and Oklahoma.

This data set represents the extent of the Ada-Vamoosa aquifer in Oklahoma.

This data set consists of digital polygons of constant hydraulic conductivity values for the High Plains aquifer in Oklahoma. This area encompasses the panhandle counties of Cimarron, Texas, and Beaver, and the western counties of Harper, Ellis, Woodward, Dewey, and Roger Mills. The High Plains aquifer underlies approximately 7,000 square miles of Oklahoma and is used extensively for irrigation. The High Plains aquifer is a water-table aquifer and consists predominately of the Tertiary-age Ogallala Formation and overlying Quaternary-age alluvial and terrace deposits. In some areas the aquifer is absent and the underlying Triassic, Jurassic, or Cretaceous-age rocks are exposed at the surface. These rocks are hydraulically connected with the aquifer in some areas. The High Plains aquifer is composed of interbedded sand, siltstone, clay, gravel, thin limestones, and caliche. The proportion of various lithological materials changes rapidly from place to place, but poorly sorted sand and gravel predominate. The rocks are poorly to moderately well cemented by calcium carbonate. The High Plains aquifer was divided into three zones with each zone having an assigned hydraulic conductivity that was used as input to a ground-water flow model on the High Plains aquifer. These values are 8.3 feet per day for the west zone, 16.2 feet per day for the central zone, and 19.3 feet per day for the east zone. The polygon boundaries and constant hydraulic conductivity values were constructed by extracting lines from digital surficial geology data sets based on a scale of 1:125,000 for the panhandle counties and 1:250,000 for the western counties. Some of the lines were digitized from maps in a published water-level elevation map for 1980. Ground-water flow models are numerical representations that simplify and aggregate natural systems. Models are not unique; different combinations of aquifer characteristics may produce similar results. Therefore, values of hydraulic conductivity used in the model and presented in this data set are not precise, but are within a reasonable range when compared to independently collected data.

This data set represents the extent of the Texas coastal uplands aquifer system in Texas.

This data set represents the extent of the Edwards-Trinity aquifer system in the states of Texas, Oklahoma, and Arkansas.

This data set consists of digital aquifer boundaries for the High Plains aquifer in western Oklahoma. This area encompasses the panhandle counties of Cimarron, Texas, and Beaver, and the western counties of Harper, Ellis, Woodward, Dewey, and Roger Mills. The High Plains aquifer underlies approximately 7,000 square miles of Oklahoma and is used extensively for irrigation. The High Plains aquifer is a water-table aquifer and consists predominately of the Tertiary-age Ogallala Formation and overlying Quaternary-age alluvial and terrace deposits. In some areas the aquifer is absent and the underlying Triassic, Jurassic, or Cretaceous-age rocks are exposed at the surface. These rocks are hydraulically connected with the aquifer in some areas. The High Plains aquifer is composed of interbedded sand, siltstone, clay, gravel, thin limestones, and caliche. The proportion of various lithological materials changes rapidly from place to place, but poorly sorted sand and gravel predominate. The rocks are poorly to moderately well cemented by calcium carbonate. The aquifer boundaries were constructed by extracting lines from digital surficial geology data sets based on a scale of 1:125,000 for the panhandle counties and 1:250,000 for the western counties. Some of the lines were digitized from maps in a published water-level elevation map for 1980.

The Central Oklahoma aquifer underlies an area of about 2,900 square miles in central Oklahoma. The aquifer is in the Central Lowland Physiographic Province and consists of Garber Sandstone and the Wellington Formation, which are part of the Sumner Group of Permian age. The maximum thickness of the aquifer is about 1,000 feet with a saturated thickness ranging from 150 to 650 feet. The aquifer is an important source of water for public, domestic, and commercial use (HA 730-E). This product provides source data for the Central Oklahoma aquifer framework, including: Georeferenced images: 1. i_27CNRLOK_bot.tif: Digitized figure of altitude contour lines representing the bottom of the Central Oklahoma aquifer. The original figure was from the Hydrologic Atlas 74, Plate 2, Figure 4 (HA_724_P2_F4). Extent shapefiles: 1. p_27CNRLOK.shp: Polygon shapefile containing the areal extent of the Central Oklahoma aquifer (OFR_96-454). The extent file contains no aquifer subunits. (Special Note) Other aquifer datasets included in the Brackish Water Project (PP1833) used the 'Ground Water Atlas of the United States' (HA 730-E) as a source for aquifer extents (Central_Oklahoma_AqExtent). This project sourced the extent from Open-File Report 96-454 (OFR_96-454) as it better matched the included top and bottom altitude of aquifer contour datasets. Contour line shapefiles: 1. c_27CNRLOK_top.shp: Contour line dataset containing altitude values, in feet reference to National Geodetic Vertical Datum of 1929 (NGVD29), across the top of the Central Oklahoma aquifer (OFR_96-454). These data were used to create the ra_27CNRLOK_top.tif raster dataset. 2. c_27CNRLOK_bot.shp: Contour line dataset containing altitude values, in feet reference to NGVD29, across the bottom of the Central Oklahoma aquifer (HA_724_P2_F4). These data were used to create the ra_27CNRLOK_bot.tif raster dataset. Altitude raster files: 1. ra_27CNRLOK_top.tif: Altitude raster dataset of the top of the Central Oklahoma aquifer. The altitude values are in meters reference to North American Vertical Datum of 1988 (NAVD88). This raster was interpolated from the c_27CNRLOK_top.shp dataset. 2. ra_27CNRLOK_bot.tif: Altitude raster dataset of the bottom of the Central Oklahoma aquifer. The altitude values are in meters reference to NAVD88. This raster was interpolated from the c_27CNRLOK_bot.shp dataset. Depth raster files: 1. rd_27CNRLOK_top.tif: Depth raster dataset of the top of the Central Oklahoma aquifer. The depth values are in meters below land surface (NED, 100-meter). 2. rd_27CNRLOK_bot.tif: Depth raster dataset of the bottom of the Central Oklahoma aquifer. The depth values are in meters below land surface (NED, 100-meter).