Adams, Gregory P. Runkle, Donna Rea, Alan 1997 1.0 map Open-File Report 96-447 Reston, VA U.S. Geological Survey http://water.usgs.gov/lookup/getspatial?ofr96-447_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 Canton Lake to Lake Overholser in central Oklahoma. Ground water in approximately 400 square miles of Quaternary-age alluvial and terrace aquifer is an important source of water for irrigation, industrial, municipal, stock, and domestic supplies. The aquifer consists of clay, silt, sand, and gravel. Sand-sized sediments dominate the poorly sorted, fine to coarse, unconsolidated quartz grains in the aquifer. The hydraulically connected alluvial and terrace deposits unconformably overlie Permian-age formations. The aquifer is overlain by a layer of wind-blown sand in parts of the area. A uniform recharge rate of 1 inch per year was used as input to the ground-water flow model for the aquifer and is used in this data set. The features representing boundaries along geological contacts were extracted from published digital surficial geology data sets based on a scale of 1:250,000. The northwest and southeast geographic limits of the aquifer and were digitized from a folded paper map in a ground-water modeling report, at a scale of 1:250,000 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 Canton Lake to Lake Overholser in central Oklahoma. Ground water in approximately 400 square miles of Quaternary-age alluvial and terrace aquifer is an important source of water for irrigation, industrial, municipal, stock, and domestic supplies. The aquifer consists of clay, silt, sand, and gravel. Sand-sized sediments dominate the poorly sorted, fine to coarse, unconsolidated quartz grains in the aquifer. The hydraulically connected alluvial and terrace deposits unconformably overlie Permian-age formations. The aquifer is overlain by a layer of wind-blown sand in parts of the area (Christenson, 1983). A uniform recharge rate of 1 inch per year was used as input to the ground-water flow model for the aquifer and is used in this data set. A uniform recharge rate of 1 inch per year is used in this data set for the alluvial and terrace deposits. This value was determined by Christenson (1983, page 18) during the calibration of a steady-state ground-water flow model of the alluvial and terrace deposits. A value of -99999 indicates the recharge is not known. 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 1.0 inches per year was multiplied by 100 and stored in the digital data sets as 100 in hundredths of an inch per year. Features representing boundaries along geological contacts were extracted from digital geology data sets by Cederstrand (1996a, 1996b, 1996c) based on a scale of 1:250,000. Boundaries defining the northwest and southeast geographic limits of the aquifer were digitized from a folded paper map in the ground-water modeling report, "Numerical simulation of the alluvium and terrace aquifer along the North Canadian River from Canton Lake to Lake Overholser, central Oklahoma," by Christenson (1983, plate 6), at a scale of 1:250,000. 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 Clinton quadrangle, west-central Oklahoma: U.S. Geological Survey Open-File Report 96-373, 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 Cederstrand, J.R., 1996c, Digital geologic map of Woodward quadrangle, northwest Oklahoma: U.S. Geological Survey Open-File Report 96-381, 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 Christenson, S.C., 1983, Numerical simulation of the alluvium and terrace aquifer along the North Canadian River from Canton Lake to Lake Overholser, central Oklahoma: U.S. Geological Survey Water Resources Investigations Report 83-4076, 36 p. Environmental Systems Research Institute, Inc. (ESRI), 1995, ARC/INFO Command Reference, ARC/INFO On-line manuals: Redlands, CA. 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. 1983 publication date Complete None planned -98.5805 -97.6626 36.1427 35.4695 none ground-water vulnerability groundwater vulnerability aquifers ground water groundwater North Canadian River alluvial and terrace aquifer North Canadian alluvial and terrace aquifer alluvial and terrace aquifer terrace aquifer alluvial aquifer terrace alluvium ground-water recharge groundwater recharge recharge rates recharge inlandWaters none central Oklahoma None. Features representing geological contacts were extracted digital geology data sets by Cederstrand (1996a, 1996b, 1996c), based on a scale of 1:250,000. Lines defining the geographic limits of the aquifer were digitized from a folded paper map (19 inches by 17 inches) at a scale of 1:250,000 (Christenson, 1983, pl. 6). The lines that were digitized had a maximum root-mean-squared-error (RMSE) of 0.008 map inches (0.020 map centimeters) or 169.03 feet (51.52 meters) ground distance. Recharge polygons represented at these scales 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?OFR96-447/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 96-373 Oklahoma City, OK U.S. Geological Survey http://wwwok.cr.usgs.gov/gis/geology/index.html Cederstrand, Joel R. 1996 1.0 map Open-File Report 96-378 Oklahoma City, OK U.S. Geological Survey http://wwwok.cr.usgs.gov/gis/geology/index.html Cederstrand, Joel R. 1996 1.0 map Open-File Report 96-381 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 the areas for the alluvial and terrace deposits published on plate 1 for the specified recharge rate reported on page 18 by Christenson (1983). Boundaries for areas of the specified recharge rate with a value of 2 for the LSOURCE line attribute were taken from Cederstrand (1996a, 1996b, 1996c). None 100 meters Resolution as reported None. Features representing boundaries along geological contacts were extracted from digital geology data sets by Cederstrand (1996a, 1996b, 1996c) using the ARC/INFO GET command. 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). ARC/INFO PROJECT command (ESRI, 1995) was used to convert the report data set projection from Albers Conical Equal Area to Universal Transverse Mercator-Zone 14. Boundaries defining the northwest and southeast geographic limits of the aquifer were digitized from a folded paper map, at a scale of 1:250,000. The map was based on Transverse Mercator projection, with central meridians of 99 and 97 degrees west longitude. Nine registration tics, located at township and range corners, were projected into Universal Transverse Mercator-Zone 14 the projection used for manual digitizing. The boundaries were digitized in one session with a maximum registration root-mean-squared error (RMSE) of 0.008 inches map (0.020 centimeters) map distance or 169.03 feet (51.52 meters) ground distance. The data set was edited to delete extraneous pseudo and dangle nodes. The ARC/INFO CLEAN command (ESRI, 1995) was used with dangle length of 1000.0 meters and fuzzy tolerance of 328.1 feet (100.0 meters). In the initial digitizing, the registration tics used were township and range corners taken from 1:24,000-scale topographic maps. A comparison of a paper plot of the report data set with the source map showed that the corners used as registration tics were not in the same locations on the 1:250,000-scale aquifer map. To correct the problem, three 1:250,000-scale U.S. Geological Survey quadrangle maps were registered using latitudinal and longitudinal registration tics, with a maximum registration root-mean-squared-error (RMSE) of 0.008 inches (0.020 centimeters) map distance or 190.22 feet (57.98 meters) ground distance. Twenty-seven registration tics were selected and digitized from the quadrangle maps, 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 digitized lines to more closely match the source map. The root-mean-squared-error (RMSE) for TRANSFORM was 189.3 feet (57.7 meters) ground distance. The ARC/INFO PROJECT command (ESRI, 1995) was used to convert the data set projection from Universal Transverse Mercator-Zone 14 to Transverse Mercator, with central meridians of 99 and 97 degrees west longitude. A comparison of this transformed data set to the pretransformed data set showed no difference in the digitized polygon boundaries. 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). Polygons were attributed for R and lines were attributed for LSOURCE. Verification of attribute codes were made by comparing a paper plot of the data set with the source map. The ARC/INFO PROJECT command (ESRI, 1995) was used to convert the report data set projection to Albers Conical Equal Area. 1996 Vector Point 6 String 12 GT-polygon composed of chains 7 Albers Conical Equal Area 29.5 45.5 -96 23 0.0 0.0 coordinate pair 100 meters 100 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 Christenson (1983) 100, -99999 n/a n/a MAJOR1 Recharge, in hundredths of an inch per year Christenson (1983) 100, -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 Christenson (1983), Cederstrand (1996a,1996b,1996c) 1,2 n/a n/a MAJOR1 Source of line Christenson (1983), Cederstrand (1996a,1996b,1996c) 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, containing recharge values expressed in hundredths of an inch per year. The recharge value of 1.00 inch per year is stored as an R value of 100. The number -99999 indicates the recharge value is unknown. 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 line source. An LSOURCE code of 1 indicates the line was digitized from Christenson (1983), and an LSOURCE code of 2 indicates the line was extracted from Cederstrand (1996a, 1996b, 1996c). 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+ofr96-447_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/ofr96-447_recharg.e00.gz Other DLG file format zipped 1 http://water.usgs.gov/GIS/dsdl/ofr96-447_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+ofr96-447_recharg FGDC Content Standards for Digital Geospatial Metadata FGDC-STD-001-1998