Becker, Carol J. Runkle, Donna Rea, Alan 1997 1.0 map Open-File Report 96-451 Reston, VA U.S. Geological Survey http://water.usgs.gov/lookup/getspatial?ofr96-451_wlelev This data set consists of digitized water-level elevation contours 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 water-level elevations were measured in January, February, and March 1980 and ranged from about 4,650 feet above sea level in Cimarron County to about 2,000 feet above sea level in Woodward County. The water-level elevation contours were digitized from folded paper maps in a published report. The source maps were published at a scale of 1:250,000. 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, or existing digital geospatial data sets that could be used in ground-water vulnerability analysis. Introduction -- This data set consists of digitized water-level elevation contours 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 (Havens and Christenson, 1984). 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 (Havens, 1984). 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. The water-level elevations were measured in January, February, and March 1980 by the Oklahoma Water Resources Board (Havens, 1982). The altitude of the water table ranged from about 4,650 feet above sea level in Cimarron County to about 2,000 feet above sea level in Woodward County and generally slopes from west to east at an average rate of about 14 feet per mile. The contour interval is 50 feet. A water-level elevation contour, 2,150 feet, is missing at the northeastern edge of the aquifer in this data set. The contour is not shown on sheet 1 of the source maps (Havens and Christenson, 1984). The water-level elevation contours were digitized from folded paper maps from the U.S. Geological Survey publication "Altitude and configuration of the 1980 water table in the High Plains regional aquifer, northwestern Oklahoma" by Havens (1982, sheets 1 and 2). The source maps were published at a scale of 1:250,000. 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 -- Environmental Systems Research Institute, Inc. (ESRI), 1995, ARC/INFO Command Reference, ARC/INFO On-line manuals: Redlands, CA. Havens, J.S., 1982, Altitude and configuration of the 1980 water table in the High Plains regional aquifer, northwestern Oklahoma: U.S. Geological Survey Water-Resources Investigations Open-File Report 82-100, scale 1:250,000, 2 sheets. Havens, J.S., and Christenson, S.C., 1984, Numerical simulation of the High Plains regional aquifer, northwestern Oklahoma: U.S. Geological Survey Water-Resources Investigation Report 83-4269, 27 p. 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. 1980 ground condition, Water-levels measured in January, February, and March 1980 Complete None planned -102.8907 -99.3046 37.1223 35.3152 none High Plains aquifer Ogallala Formation Ogallala aquifer 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 panhandle of Oklahoma western counties in Oklahoma western Oklahoma northwestern Oklahoma None. This data set was digitized from two maps published at a scale of 1:250,000. The maps represent the elevations of water levels in the aquifer in January, February, and March 1980 (Havens, 1982). 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 folded paper maps (sheet 1 is 25 inches by 35.5 inches, sheet 2 is 47 inches by 19 inches), with a maximum registration root-mean-square-error (RMSE) 0.018 map inches (0.046 map centimeters) and 383.9 feet (117 meters) ground distance for the panhandle counties on sheet 1 and 0.011 map inches (0.028 map centimeters) and 223.1 feet (68 meters) ground distance for the western counties on sheet 2. 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?OFR96-451/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 published on sheets 1 and 2 by Havens (1982). None 200 meters Resolution as reported None. A tic data set was created using township and range corners taken from 1:24,000-scale topographic maps. 19960117 The water-level elevation contours for the panhandle counties were digitized in one session from a folded paper map (Havens, 1982, sheet 1) with a maximum registration root-mean-squared-error (RMSE) of 0.018 map inches (0.046 map centimeters) and 383.9 feet (117 meters) ground distance. The water-level elevation contours for the western Oklahoma counties also were digitized in one session from a folded paper map (Havens, 1982, sheet 2) with a maximum registration root-mean-squared-error (RMSE) 0.011 map inches (0.028 map centimeters) and 223.1 feet (68 meters) ground distance. Dangling nodes were edited and the ARC/INFO command CLEAN (ESRI, 1995) was used on both data sets using a dangle length of 164 feet (50 meters) and a fuzzy tolerance of 328.1 feet (100 meters). 19960126 The data sets were combined using the ARC/INFO command GET (ESRI, 1995). Contour lines were attributed for ELEV and LTYPE. 19960205 Paper plots of the data set were compared with the original maps for accuracy. 19960214 In the initial digitizing, the registration tics used were township and range corners taken from 1:24,000-scale topographic maps. A comparison of paper plots of the data set with source maps (Havens, 1982, sheets 1 and 2) showed the 1:24,000-scale township and range corners were not in the same locations on the 1:250,000-scale source maps. To correct the problem, 1:250,000-scale U.S. Geological Survey quadrangle maps were registered on the digitizer using latitudinal and longitudinal registration tics, with a maximum registration root-mean-squared error (RMSE) of 0.015 inches (0.038 centimeters) map units and 308 feet (94 meters) ground distance for the panhandle and western counties. Six registration tics were selected on each quadrangle map and digitized, and given the same tic identification numbers as the tics that were used initially. These new tics were used with the ARC/INFO TRANSFORM command (ESRI, 1995) to adjust the lines to more closely match the original map (Havens, 1982). The root-mean-squared error (RMSE) for TRANSFORM was 0.015 inches (0.038 centimeters) map units and 308 feet (94 meters) ground distance for the panhandle counties and 0.012 inches (0.031 centimeters) map units and 259.2 feet (79 meters) ground distance for the western counties. The error may be as large as about 656.2 feet (200 meters) ground distance or 0.032 inches or (0.08 centimeters) on 1:250,000-scale maps. 19960306 Vector Point String 264 GT-polygon composed of chains Albers Conical Equal Area 29.5 45.5 -96 23 0.0 0.0 coordinate pair 200 meters 200 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 Havens (1982) 2,000 4,650 LTYPE Line type Havens (1982) 1,2 n/a n/a MAJOR1 Water-level contour elevation in feet above NGVD29 Havens (1982) 2,000 4,650 MINOR1 Line type Havens (1982) 1,2 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 National Geodetic Vertical Datum of 1929 (NGVD29). The second attribute, LTYPE, contains a code indicating whether the line is solid (1) or dashed (2) on the source 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 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+ofr96-451_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/ofr96-451_wlelev.e00.gz Other DLG file format zipped 1 http://water.usgs.gov/GIS/dsdl/ofr96-451_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+ofr96-451_wlelev FGDC Content Standards for Digital Geospatial Metadata FGDC-STD-001-1998