Becker, Carol J. Runkle, Donna Rea, Alan 1997 1.0 map Open-File Report 96-449 Reston, VA U.S. Geological Survey http://water.usgs.gov/lookup/getspatial?ofr96-449_wlelev This data set consists of digitized water-level elevation contours 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. Water-level elevations were measured in July 1973 and ranged from about 2,200 feet above sea level at the northwestern edge of the aquifer to about 1,700 feet above sea level at the southeastern edge of the aquifer. The water-level elevation contours were digitized from a photocopy of a paper map from a ground-water modeling thesis. The source map was 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 water-level elevation contours 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. In this report, elevation refers to distance above sea level and sea level refers to the National Gedodetic Vertical Datum of 1929 (NGVD29)--a geodetic datum derived from a general adjustment of the first-order level nets of both the United States and Canada, formerly called Sea Level Datum of 1929. Water-level elevations were measured July 1973 (Lyons, 1981) and ranged from about 2,200 feet above sea level at the northwestern edge of the aquifer to about 1,700 feet above sea level at the southeastern edge of the aquifer. The water-level elevation contours 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 water-level elevations also were used by Kent, Lyons, and Witz (1983) in a ground-water model 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.D., and Witz, F.E., 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 Resources 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. 19730701 ground condition Complete None planned. -99.6808 -99.0912 35.5289 35.2285 none Doxey Shale Ogallala Formation Ogallala aquifer High Plains aquifer Elk City aquifer Elk City Sandstone aquifer Elk City Sandstone terrace deposits dune sand ground-water vulnerability groundwater vulnerability aquifers ground water groundwater ground-water levels groundwater levels water levels ground-water level elevation groundwater level elevation ground-water level elevation contours groundwater level elevation contours water-level elevation contours water level elevation contours water-level contours water level contours water-level elevation water level elevation inlandWaters none western Oklahoma None. This data set was digitized from a photocopy of a map published at a scale of 1:63,360. The map represents the elevation of the water levels in the aquifer in July 1973 (Lyons, 1981). Water-level elevation contours represented at this scale are indicative of broad, regional trends and should not be interpreted as site specific. The water-level elevation contours were digitized from a plate size (29 inches by 39 inches) paper map with a maximum root-mean-square-error (RMSE) of 0.015 map inches (0.038 map centimeters) and 249 feet (76 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 http://water.usgs.gov/lookup/get?OFR96-449/browse.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) Chain-node topology present. This data set includes all the water-level elevation contours as reported by Lyons (1981) on plate 2. None 16 meters Resolution as reported None. A tic data set was created using 1:250,000-scale U.S. Geological Survey quadrangle maps. 19960314 Water-level elevation contours were digitized in one session with a maximum registration root-mean-squared-error (RMSE) of 0.015 map inches (0.038 map centimeters) and 249 feet (76 meters) ground distance. The data set was edited and the lines were attributed for LTYPE and ELEV. 19960319 The data set was plotted and compared to the source map for accuracy. 19960329 The data set was documented. 19960422 Vector Point String 53 GT-polygon composed of chains Albers Conical Equal Area 29.5 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 WLELEV.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 WLELEV# Internal feature number Computed Sequential unique positive integer n/a n/a WLELEV-ID User-assigned feature number User-defined Integer n/a n/a ELEV Water-level contour elevation in feet above NGVD29 Lyons (1981) 1,700 2,200 LTYPE Line type Lyons (1981) 1 n/a n/a MAJOR1 Water-level contour elevation in feet above NGVD29 Lyons (1981) 1,700 2,200 MINOR1 Line type Lyons (1981) 1 n/a n/a Two attributes are associated with each line in this digital data set. The first attribute, ELEV, contains the elevation of the water-level contour, expressed in feet above the North American Vertical Datum of 1929. The second attribute, LTYPE, contains a code of 1 indicating the line is solid on the published map. ELEV is stored in the first major code (MAJOR1), and LTYPE 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 Ask USGS - Water Webserver Team mailing

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Reston VA 20192 1-888-275-8747 (1-888-ASK-USGS) http://answers.usgs.gov/cgi-bin/gsanswers?pemail=h2oteam&subject=GIS+Dataset+ofr96-449_wlelev 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 http://water.usgs.gov/GIS/dsdl/ofr96-449_wlelev.e00.gz Other DLG file format zipped 1 http://water.usgs.gov/GIS/dsdl/ofr96-449_wlelev.dlg.gz None. This dataset is provided by USGS as a public service. 20041108 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) http://answers.usgs.gov/cgi-bin/gsanswers?pemail=h2oteam&subject=GIS+Dataset+ofr96-449_wlelev FGDC Content Standards for Digital Geospatial Metadata FGDC-STD-001-1998