Becker, Carol J. Runkle, Donna Rea, Alan 1997 1.0 map Open-File Report 96-449 Reston, VA U.S. Geological Survey https://water.usgs.gov/lookup/getspatial?ofr96-449_aqbound This data set consists of digitized aquifer boundaries for the Elk City aquifer in western Oklahoma. The aquifer covers an area of approximately 193,000 acres and supplies ground water for irrigation, domestic, and industrial purposes in Beckham, Custer, Roger Mills, and Washita Counties along the divide between the Washita and Red River basins. The Elk City aquifer consists of the Elk City Sandstone and overlying terrace deposits, made up of clay, silt, sand and gravel, and dune sands in the eastern part and sand and gravel of the Ogallala Formation (or High Plains aquifer) in the western part of the aquifer. The Elk City aquifer is unconfined and composed of very friable sandstone, lightly cemented with clay, calcite, gypsum, or iron oxide. Most of the grains are fine-sized quartz but the grain size ranges from clay to cobble in the aquifer. The Doxey Shale underlies the Elk City aquifer and acts as a confining unit, restricting the downward movement of ground water. The aquifer boundaries were digitized from a photocopy of a paper map from a ground-water modeling thesis of Elk City aquifer published at a scale of 1:63,360. This data set was created for a project to develop data sets to support ground-water vulnerability analysis. The objective was to create and document a digital geospatial data set from a published report or map that could be used in ground-water vulnerability analysis. Introduction -- This data set consists of digitized aquifer boundaries for the Elk City aquifer in western Oklahoma. The aquifer covers an area of approximately 193,000 acres and supplies ground water for irrigation, domestic, and industrial purposes in Beckham, Custer, Roger Mills, and Washita Counties along the divide between the Washita and Red River basins (Lyons, 1981). The Elk City aquifer consists of the Elk City Sandstone and overlying terrace deposits, made up of clay, silt, sand and gravel, and dune sands in the eastern part and sand and gravel of the Ogallala Formation (or High Plains aquifer) in the western part of the aquifer (Lyons, 1981). The Elk City aquifer is unconfined and composed of very friable sandstone, lightly cemented with clay, calcite, gypsum, or iron oxide. Most of the grains are fine-sized quartz but the grain size ranges from clay to cobble in the aquifer (Lyons, 1981). The Doxey Shale underlies the Elk City aquifer and acts as a confining unit, restricting the downward movement of ground water. This data set consists of digitized aquifer boundaries for the Elk City aquifer in western Oklahoma. The aquifer boundaries were digitized from a photocopy of a paper map from the ground-water modeling thesis, "A ground-water management model for the Elk City Aquifer in Washita, Beckham, Custer and Roger Mills Counties, Oklahoma," by Lyons (1981). The source map was published at a scale of 1:63,360. The aquifer boundaries also were used by Kent, Lyons, and Witz (1982) in a ground-water modeling report of the Elk City aquifer. Reviews Applied to Data -- This electronic report was subjected to the same review standard that applies to all U.S. Geological Survey reports. Reviewers were asked to check the topological consistency, tolerances, attribute frequencies and statistics, projection, and geographic extent. Reviewers were given digital data sets and paper plots for checking against the source maps to verify the linework and attributes. The reviewers checked the metadata and a_readme.1st files for completeness and accuracy. Related Spatial and Tabular Data Sets -- This data set is one of four digital map data sets being published together for this aquifer. The four data sets are: > aqbound - aquifer boundaries > cond - hydraulic conductivity > recharg - aquifer recharge > wlelev - water-level elevation contours Digital map data sets of the Oklahoma surficial geology digitized from 1:250,000-scale maps (or 1:125,000-scale maps for the three Oklahoma panhandle counties) are published separately. Other References Cited -- Kent, D.C., Lyons T., Witz, F., 1982. Evaluation of aquifer performance and water supply capabilities of the Elk City aquifer in Washita, Beckham, Custer, and Roger Mills Counties, Oklahoma: Stillwater, OK, Department of Geology, Oklahoma State University report, 96 p., 29 figs. (Final report to the Oklahoma Water Resource Board) Lyons, T.D., 1981, A ground-water management model for the Elk City aquifer in Washita, Beckham, Custer and Roger Mills Counties, Oklahoma: Stillwater, OK, Oklahoma State University, master's thesis, 88 p., 2 pls., 43 figs. Notes -- Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government. Although this data set has been used by the U.S. Geological Survey, U.S. Department of the Interior, no warranty expressed or implied is made by the U.S. Geological Survey as to the accuracy of the data and related materials. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the U.S. Geological Survey in the use of this data, software, or related materials. 1981 publication date Complete None planned -99.6843 -99.0728 35.5616 35.2183 USGS Thesaurus ground-water vulnerability groundwater vulnerability aquifers ground water groundwater Doxey Shale Ogallala Formation Ogallala aquifer High Plains aquifer Elk City aquifer Elk City Sandstone aquifer Elk City Sandstone terrace deposits dune sand aquifer boundary inlandWaters ISO 19115 Topic Category geoscientificInformation inlandWaters environment USGS Metadata Identifier USGS:cca56ed6-8fd3-439f-b5b6-dbef14d402bc Geographic Names Information System western Oklahoma None. This data set was digitized from a map published at a scale of 1:63,360, and represents the aquifer boundaries as reported by Lyons (1981). Boundaries represented at this scale are indicative of broad, regional trends and should not be interpreted as site specific. The boundaries were digitized from a photocopy of a paper map (39 inches by 29 inches), with a maximum registration root-mean-squared-error of 0.017 map inches (0.043) and 302 feet (92 meters) ground distance. Carol J. Becker U.S. Geological Survey Hydrologist mailing address

202 NW 66th St., Bldg. 7

Oklahoma City Oklahoma 73116 United States of America 1-888-275-8747 (405) 843-7712 cjbecker@usgs.gov none https://water.usgs.gov/GIS/browse/ofr96-449.gif A browse image of the four aquifer data sets. GIF Compilation of this data set and the associated metadata was funded under a cooperative Joint Funding Agreement between the U.S. Geological Survey and the State of Oklahoma, Office of the Secretary of Environment. Public UNCLASSIFIED None Operating System-- UNIX, ARC/INFO Version 7.0.3,(Mon Mar 13 22:21:55 PST 1995) Polygon and chain-node topology present. This coverage contains the aquifer boundary as defined by Lyons (1981) in plate 2 titled "Water table map of the Elk City Sandstone." None 16 meters Resolution as reported None. A tic data set was created using 1:250,000-scale U.S. Geological Survey quadrangle maps. Five tics were registered on the source map and the aquifer boundary polygon was digitized in one session with a maximum registration of root-mean-squared-error (RMSE) of 0.017 map inches (0.043 map centimeters) and 302 feet (92 meters) ground distance. 19960315 The data set was plotted and compared to the source map for accuracy. 19960319 The polygon was attributed for AQTYPE and lines were attributed for LSOURCE. 19960613 The data set was documented. 19960823 Vector Point 1 String 6 GT-polygon composed of chains 2 Albers Conical Equal Area 45.5 45.5 -96 23 0.0 0.0 coordinate pair 16 meters 16 meters METERS North American Datum of 1983 Geodetic Reference System 80 6378137 298.257 AQBOUND.PAT Polygon attribute table of AQBOUND ARC/INFO - Polygon attribute table of AQBOUND ARC/INFO - n/a n/a AREA Area of polygon in square coverage units Computed Positive real numbers n/a n/a PERIMETER Perimeter of polygon in coverage units Computed Positive real numbers n/a n/a AQBOUND# Internal feature number Computed Sequential unique positive integer n/a n/a AQBOUND-ID User-assigned feature number User-defined Integer n/a n/a AQTYPE Aquifer type Lyons (1981) 1 n/a n/a MINOR1 Blank item for DLG Calculated 0 n/a n/a MAJOR1 Aquifer type Lyons (1981) 1 n/a n/a AQBOUND.AAT Arc attribute table ARC/INFO - Arc attribute table ARC/INFO - n/a n/a FNODE# Internal number of from-node Computed Sequential unique positive integer n/a n/a TNODE# Internal number of to-node Computed Sequential unique positive integer n/a n/a LPOLY# Internal number of poly to left of arc Computed Sequential unique positive integer n/a n/a RPOLY# Internal number of poly to right of arc Computed Sequential unique positive integer n/a n/a LENGTH Length of arc in coverage units Computed Positive real numbers n/a n/a AQBOUND# Internal feature number Computed Sequential unique positive integer n/a n/a AQBOUND-ID User-assigned feature number User-defined Integer n/a n/a LSOURCE Source of line Lyons (1981) 1 n/a n/a MINOR1 Blank item for DLG Calculated 0 n/a n/a MAJOR1 Source of line Lyons (1981) 1 n/a n/a The polygon in this data set has an associated attribute, AQTYPE, with a value of 1, representing where the aquifer is present. AQTYPE is stored in the first major code (MAJOR1) for polygons, and 0 is stored in the first minor code (MINOR1) in the Digital Line Graph (DLG) version of this data set Each line in this digital data set has an associated attribute, LSOURCE, that contains a code to indicate the source of the line. An LSOURCE code of 1 indicates the line was digitized from Lyons (1981). LSOURCE is stored in the first major code (MAJOR1) for lines, and 0 is stored in the first minor code (MINOR1) in the Digital Line Graph (DLG) version of this data set. See overview. U.S. Geological Survey Michael Ierardi IT Specialist mailing

445 National Center

Reston VA 20192 1-888-275-8747 (1-888-ASK-USGS) mierardi@usgs.gov Although this data set has been used by the U.S. Geological Survey, U.S. Department of the Interior, no warranty expressed or implied is made by the U.S. Geological Survey as to the accuracy of the data and related materials. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the U.S. Geological Survey in the use of this data, software, or related materials. Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government. Export Full coverage zipped 1 https://water.usgs.gov/GIS/dsdl/ofr96-449_aqbound.e00.gz Other DLG file format zipped 1 https://water.usgs.gov/GIS/dsdl/ofr96-449_aqbound.dlg.gz None. This dataset is provided by USGS as a public service. 20201117 U.S. Geological Survey Ask USGS -- Water Webserver Team mailing

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Reston VA 20192 1-888-275-8747 (1-888-ASK-USGS) mierardi@usgs.gov FGDC Content Standards for Digital Geospatial Metadata FGDC-STD-001-1998