Becker, Carol J. Runkle, Donna Rea, Alan 1997 1.0 map Open-File Report 96-450 Reston, VA U.S. Geological Survey https://water.usgs.gov/lookup/getspatial?ofr96-450_recharg This data set consists of a digitized polygon of a constant recharge value for the Enid isolated terrace aquifer in northwestern Oklahoma. The Enid isolated terrace aquifer covers approximately 82 square miles and supplies water for irrigation, domestic, municipal, and industrial use for the City of Enid and western Garfield County. The Quaternary-age Enid isolated terrace aquifer is composed of terrace deposits that consist of discontinuous layers of clay, sandy clay, sand, and gravel. The aquifer is unconfined and is bounded by the underlying Permian-age Hennessey Group on the east and the Cedar Hills Sandstone Formation of the Permian-age El Reno Group on the west. Cedar Hills Sandstone Formation fills a channel beneath the thickest section of the Enid isolated terrace aquifer in the midwestern part of the aquifer. The polygons boundary was digitized from a photocopy of a paper map from a ground-water modeling thesis and report. The map digitized was published at a scale of 1:62,500. The recharge value reported in the ground-water modeling thesis and report for the Enid isolated terrace aquifer is 2.3 inches per year. 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 recharge 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 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 a digitized polygon of a constant recharge value for the Enid isolated terrace aquifer in northwestern Oklahoma. The Enid isolated terrace aquifer covers approximately 82 square miles and supplies water for irrigation, domestic, municipal, and industrial use for the City of Enid and western Garfield County (Beausoleil, 1981). The Quaternary-age Enid isolated terrace aquifer is composed of terrace deposits that consist of discontinuous layers of clay, sandy clay, sand, and gravel. The aquifer is unconfined and is bounded by the underlying Permian-age Hennessey Group on the east and the Cedar Hills Sandstone Formation of the Permian-age El Reno Group on the west. Cedar Hills Sandstone Formation fills a channel beneath the thickest section of the Enid isolated terrace aquifer in the midwestern part of the aquifer (Beausoleil, 1981). This data set consists of a digitized polygon of a constant recharge value for the Enid isolated terrace aquifer in northwestern Oklahoma. The polygon boundary was digitized from a photocopy of a paper map from the ground-water modeling thesis, "A ground-water management model for the Enid isolated terrace aquifer in Garfield County, Okahoma," by Beausoleil (1981, plate 4). The source map, plate 4, was published at a scale of 1:62,500. Beausoleil (1981) reported the recharge value of 2.3 inches per year used in the ground-water model was based on 7 percent of the average annual precipitation of 31.11 inches per year measured at Enid, Oklahoma, from 1950 to 1979. Digital Line Graph (DLG) format requires numbers to be stored as integers. Therefore, the recharge in inches per year was multiplied by 100 and stored in the digital data sets as hundredths of inches per year. For example 2.3 inches per year was multiplied by 100 and stored in the digital data sets as 230 in hundredths of an inch per year. A recharge value of 2.3 inches per year also was used in the ground-water model of the Enid isolated terrace aquifer by Kent, Beausoleil, and Witz (1982). 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. The hydraulic conductivity and recharge are closely interrelated. As long as these two model inputs are in balance the model has a small mean residual; it represents the natural system numerically. If the hydraulic conductivity is accurately known, the model can be used to accurately determine recharge. Likewise, if the hydraulic conductivity is poorly known, then the recharge will be poorly determined. Therefore, values of recharge 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. Recharge probably varies considerably over the local area, and model recharge is at best an average over an area at least as large as the model grid (and probably much larger than a single cell). 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 -- Beausoleil, Y.J., 1981, A ground-water management model for the Enid isolated terrace aquifer in Garfield County, Oklahoma: Stillwater, OK, Oklahoma State University, master's thesis, 66 p., 4 pls., 25 figs. Kent, D.C., Beausoleil, Y.J. and Witz, F.E., 1982, Evaluation of aquifer performance and water supply capabilities of the Enid isolated terrace aquifer in Garfield County, Oklahoma: Stillwater, OK, Department of Geology, Oklahoma State University report, 58 p., 19 figs. (Final report to the Oklahoma Water Resource Board) 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 -97.9764 -97.7572 36.5099 36.3679 USGS Thesaurus ground-water vulnerability groundwater vulnerability aquifers ground water groundwater Enid isolated terrace aquifer Enid terrace aquifer Enid aquifer recharge recharge rate ground-water recharge inlandWaters ISO 19115 Topic Category geoscientificInformation inlandWaters environment USGS Metadata Identifier USGS:b4521100-17e8-48ea-ac59-79fc77ea8dbe Geographic Names Information System northwestern Oklahoma None. This data set was digitized from a map published at a scale of 1:62,500 and represents the recharge polygon as reported by Beausoleil (1981) on plate 4. The recharge polygon represented at this scale is indicative of broad, regional trends and should not be interpreted as site specific. The recharge polygon was digitized from a photocopy of a paper map (19.0 inches by 17.5 inches) with a maximum registration root-mean-squared error (RMSE) of 0.007 map inches (0.018 map centimeters) and 36 feet (11 meters) ground distance. 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. The hydraulic conductivity and recharge are closely interrelated. As long as these two model inputs are in balance the model has a small mean residual; it represents the natural system numerically. If the hydraulic conductivity is accurately known, the model can be used to accurately determine recharge. Likewise, if the hydraulic conductivity is poorly known, then the recharge will be poorly determined. Therefore, values of recharge 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. Recharge probably varies considerably over the local area, and model recharge is at best an average over an area at least as large as the model grid (and probably much larger than a single cell). 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/ofr96-450.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 data set includes the recharge polygon as reported by Beausoleil (1981) on plate 4 and the recharge value on page 26. None 29 meters Resolution as reported None. A tic coverage was created using township and range corners from 1:24,000 scale U.S. Geological Survey quadrangle maps. 19960830 The recharge polygon was digitized in one session with a maximum registration root-mean-squared error (RMSE) of 0.007 map inches (0.018 map centimeters) and 36 feet (11 meters) ground distance. The lines were attributed for LSOURCE and the polygon was attributed for R. 19960903 Vector Point 1 String 1 GT-polygon composed of chains 2 Albers Conical Equal Area 29.5 45.5 -96 23 0.0 0.0 coordinate pair 29 meters 29 meters METERS North American Datum of 1983 Geodetic Reference System 80 6378137 298.257 RECHARG.PAT Polygon attribute table ARC/INFO - Polygon attribute table 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 RECHARG# Internal feature number Computed Sequential unique positive integer n/a n/a RECHARG-ID User-assigned feature number User-defined Integer n/a n/a R Recharge, in hundredths of an inch per year Beausoleil (1981) 230 n/a n/a MAJOR1 Recharge, in hundredths of an inch per year Beausoleil (1981) 230 n/a n/a MINOR1 Blank item for DLG Calculated 0 n/a n/a RECHARG.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 polygon to left of arc Computed Sequential unique positive integer n/a n/a RPOLY# Internal number of polygon 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 RECHARG# Internal feature number Computed Sequential unique positive integer n/a n/a RECHARG-ID User-assigned feature number User-defined Integer n/a n/a LSOURCE Source of line Beausoleil (1981) 1 n/a n/a MAJOR1 Source of line Beausoleil (1981) 1 n/a n/a MINOR1 Blank item for DLG Calculated 0 n/a n/a The polygon in this data set has an associated attribute, R, containing a value of recharge as reported by Beausoleil (1981) expressed in hundredths of an inch per year. The recharge value of 2.3 inches per year is stored as an R value of 230. R 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. The LSOURCE code of 1 indicates the line was digitized from Beausoleil (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/ofr96-450_recharg.e00.gz Other DLG file format zipped 1 https://water.usgs.gov/GIS/dsdl/ofr96-450_recharg.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