Adams, Gregory P. Runkle, Donna Rea, Alan Becker, Carol J. 1997 1.0 map Open-File Report 96-448 Reston, VA U.S. Geological Survey http://water.usgs.gov/lookup/getspatial?ofr96-448_recharg This data set consists of digital polygons of a constant recharge value for the alluvial and terrace deposits along the North Canadian River from Oklahoma City to Eufaula Lake in east-central Oklahoma. Ground water in 710 square miles of Quaternary-age alluvial and terrace deposits along the North Canadian River is an important source of water for irrigation, industrial, municipal, stock, and domestic supplies. The aquifer, composed of alluvial and terrace deposits, consists of sand, silt, clay, and gravel. The aquifer is underlain and in hydraulic connection with the upper zone of the Permian-age Garber-Wellington aquifer and the Pennsylvanian-age Ada-Vamoosa aquifer. Some of the polygon boundaries were digitized from a published ground-water modeling report about the aquifer and some lines were extracted from published digital geology data sets. Recharge was estimated to range from 1.7 inches per year in the west to 7.0 inches per year in the east, with an average of 3.3 inches per year in the published ground-water modeling report. The recharge values used as input to the ground-water flow model were not published and were not available from any other source. Therefore, the alluvial and terrace deposits were assigned the average recharge value of 3.3 inches per year in this data set. 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, or existing digital geospatial data sets that could be used in ground-water vulnerability analysis. Introduction -- This data set consists of digital polygons of a constant recharge value for the alluvial and terrace deposits along the North Canadian River from Oklahoma City to Eufaula Lake in east-central Oklahoma. Ground water in 710 square miles of Quaternary-age alluvial and terrace deposits along the North Canadian River is an important source of water for irrigation, industrial, municipal, stock, and domestic supplies. The aquifer, composed of alluvial and terrace deposits, consists of sand, silt, clay, and gravel. The aquifer is underlain and in hydraulic connection with the upper zone of the Permian-age Garber-Wellington aquifer and the Pennsylvanian-age Ada-Vamoosa aquifer. Other Permian and Pennsylvanian-age rocks underlying the alluvial and terrace deposits have low permeabilities and are not in hydraulic connection with the alluvial and terrace aquifer (Havens, 1989). The constant recharge value and some of the polygon boundaries are from a ground-water modeling report published by the U.S. Geological Survey, "Geohydrology of the alluvial and terrace deposits of the North Canadian River from Oklahoma City to Eufaula Lake, central Oklahoma," by Havens (1989, p. 22 and pl. 6). Some lines representing polygon boundaries were extracted from digital surficial geology data sets by Cederstrand (1996a, 1996b) based on a scale of 1:250,000. The model-grid boundaries were digitized from a paper-base map published at a scale of 1:250,000 (Havens, 1989, plate 6). Recharge to the aquifer was estimated by Havens (1989, p.22) to range from 1.7 inches per year in the west to 7.0 inches per year in the east, with an average of 3.3 inches per year. The recharge values used as input to the ground-water flow model were not published in Havens (1989) and were not available from any other source. Therefore, the alluvial and terrace deposits were assigned the average recharge value of 3.3 inches per year in this data set. 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 3.3 inches per year was multiplied by 100 and stored in the digital data sets as 330 in hundredths of an inch per year. Permian outcrops and parts of the aquifer that were not included in the ground-water model were given a value -99999 to indicate the recharge is not known. Havens (1989) used a grid size of 2 square miles in the ground-water flow model of the alluvial and terrace deposits. 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 -- Cederstrand, J.R., 1996a, Digital geologic map of Fort Smith quadrangle, east-central Oklahoma: U.S. Geological Survey Open-File Report 96-375, based on a scale of 1:250,000, 2 diskettes. (Available in nonproprietary and ARC/INFO formats.) URL:http://wwwok.cr.usgs.gov/gis/geology/index.html Cederstrand, J.R., 1996b, Digital geologic map of Oklahoma City quadrangle, central Oklahoma: U.S. Geological Survey Open-File Report 96-378, based on a scale of 1:250,000, 2 diskettes. (Available in nonproprietary and ARC/INFO formats.) URL:http://wwwok.cr.usgs.gov/gis/geology/index.html Environmental Systems Research Institute, Inc. (ESRI), 1995, ARC/INFO Command Reference, ARC/INFO On-line manuals: Redlands, CA. Havens, J.S., 1989, Geohydrology of the alluvial and terrace deposits of the North Canadian River from Oklahoma City to Eufaula Lake, central Oklahoma: U.S. Geological Survey Water-Resources Investigations Report 88-4234, 32 p., 12 pl. 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. 1989 publication date Complete None planned -97.7581 -95.6618 35.6147 35.0633 none ground-water vulnerability groundwater vulnerability aquifers ground water groundwater North Canadian alluvial and terrace aquifer alluvial and terrace aquifer terrace aquifer terrace alluvial aquifer alluvium recharge recharge rate ground-water recharge inlandWaters none east-central Oklahoma None. Lines representing aquifer boundaries, and therefore recharge boundaries, were extracted from digital geology data sets by Cederstrand (1996a, 1996b) based on a scale of 1:250,000. Some of the model-grid boundaries (Havens, 1989, plate 6) were digitized from a paper-base map with a maximum registration root mean squared error (RMSE) of 0.0135 map inches (0.0053 map centimeters). Recharge polygons represented at this scale are indicative of broad, regional trends and should not be interpreted as site-specific. 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). Donna L. Runkle 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 dlrunkle@usgs.gov none http://water.usgs.gov/lookup/get?OFR96-448/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) Cederstrand, Joel R. 1996 1.0 map Open-File Report 96-378 Oklahoma City, OK U.S. Geological Survey http://water.usgs.gov/lookup/getspatial?ofr96-448_recharg Cederstrand, Joel R. 1996 1.0 map Open-File Report 96-375 Oklahoma City, OK U.S. Geological Survey http://wwwok.cr.usgs.gov/gis/geology/index.html Polygon and chain-node topology present. This data set includes all the areas of a specified recharge value reported by Havens (1989) on page 22 for the North Canadian alluvial and terrace deposits and were given a LSOURCE line attribute of 1. Some aquifer boundary lines are from Cederstrand (1996a, 1996b) and were given a value of 2 for the LSOURCE line attribute. The boundary lines by Cederstrand (1996a, 1996b) are more detailed and contain bedrock outcrops not shown by Havens (1989). None 64 meters Resolution as reported None. Polygon boundaries were extracted from digital geology data sets using the ARC/INFO GET command (ESRI, 1995) (use of trade names is for descriptive purposes only, and does not imply endorsement by the U.S. Government). 1996 The ARC/INFO CLEAN command (ESRI, 1995) was used with a dangle length of 0.0 feet or meters and fuzzy tolerance of 32.8 feet (10.0 meters). 1996 A comparison of a paper plot of the report data set with the mylar-base source map showed that plates 1 and 6 from Havens (1989) were published at a scale of 1:251,400 and not 1:250,000. 1996 Four tics were registered on a paper-source map (Havens, 1989, plate 6) and a few of the model-grid boundaries were digitized in one session with a maximum registration root mean squared error (RMSE) of 0.0135 map inches (0.0053 map centimeters). The data was edited to delete extraneous pseudo and dangle nodes. The ARC/INFO CLEAN command (ESRI, 1995), was used with a dangle length of 82 feet (25 meters) and fuzzy tolerance of 246 feet (75 meters). 1996 Lines were attributed for LSOURCE and polygons were attributed for R. Verification of attribute codes was made by comparing paper plots of the report data set with the source maps. 1996 Vector Point 164 String 503 GT-polygon composed of chains 165 Albers Conical Equal Area 29.5 45.5 -96 23 0.0 0.0 coordinate pair 64 meters 64 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 Havens (1989) 330, -99999 n/a n/a MAJOR1 Recharge, in hundredths of an inch per year Havens (1989) 330, -99999 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 Cederstrand (1996a, 1996b), Havens (1989) 1,2 n/a n/a MAJOR1 Source of line Cederstrand (1996a, 1996b), Havens (1989) 1,2 n/a n/a MINOR1 Blank item for DLG Calculated 0 n/a n/a Each polygon in this data set has an associated attribute, R, that contains a recharge value (Havens, 1989) expressed in hundredths of an inch per year. The recharge value of 3.3 inches per year is stored as an R value of 330 hundredths of an inch per year. Polygons in this data set that contain a R of -99999 represent areas where the recharge rate is not known. R is stored in the first major code (MAJOR1) and 0 is stored in the first minor code (MINOR1) for polygons 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. A LSOURCE code of 1 indicates the line is from Havens (1989) and a LSOURCE code of 2 indicates the line was extracted from Cederstrand (1996a, 1996b). 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 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+ofr96-448_recharg 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/ofr96-448_recharg.e00.gz Other DLG file format zipped 1 http://water.usgs.gov/GIS/dsdl/ofr96-448_recharg.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+ofr96-448_recharg FGDC Content Standards for Digital Geospatial Metadata FGDC-STD-001-1998