Abstract: This data set consists of digital aquifer boundaries 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. The aquifer boundaries established in a ground-water modeling report and are available in this data set include areas: 1) where the alluvial and terrace deposits have been deposited against relatively impermeable Permian-age formations; 2) where the underlying Permian-age formations crop out within the alluvial and the terrace deposits due to protruding high spots on the Permian-age formations irregular surface; 3) where the aquifer extends beyond the geographic limit of the study area defined in the ground-water modeling report; and 4) where the aquifer has little or no saturated thickness. The lines in the data set representing aquifer boundaries along geological contacts were extracted from published digital surficial geology data sets based on a scale of 1:250,000. Boundaries defining the northwest and southeast geographic limits of the aquifer and areas of little or no saturated thickness were digitized from folded paper maps, at a scale of 1:250,000, in the ground-water modeling report.
Purpose: 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.
Supplemental Information: Introduction -- This data set consists of digital aquifer boundaries 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). The aquifer boundaries established in a ground-water modeling report (Christenson, 1983) and are available in this data set include areas: 1) where the alluvial and terrace deposits have been deposited against relatively impermeable Permian-age formations; 2) where the underlying Permian-age formations crop out within the alluvial and the terrace deposits due to protruding high spots on the Permian-age formations irregular surface; 3) where the aquifer extends beyond the geographic limit of the study area defined in the ground-water modeling report; and 4) where the aquifer has little or no saturated thickness. The lines in the data set representing aquifer boundaries along geological contacts were extracted from published digital surficial geology data sets (Cederstrand, 1996a, 1996b, 1996c) based on a scale of 1:250,000. The northwest and southeast geographic limits of the aquifer and areas of little or no saturated thickness were digitized from folded paper maps 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, plates 1 and 6) 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 -- 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.

Progress: Complete
Update Frequency: None planned

Theme Keywords: 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, aquifer boundary, inlandWaters
Place Keywords: central Oklahoma

Access Constraints: None.
Usage Constraints: Features representing aquifer boundaries as reported by Christenson (1983) along geological contacts were extracted from digital geology data sets by Cederstrand (1996a, 1996b, 1996c) based on a scale of 1:250,000. Boundaries indicating the geographic limits of the aquifer and areas of little or no saturated thickness were digitized from a folded paper map at a scale of 1:250,000 (Christenson, 1983). Aquifer boundaries digitized from the (19 inches by 17 inches) base map had a maximum registration root-mean-squared-error (RMSE) of 0.008 map inches (0.020 map centimeters) or 169.03 feet (51.52 meters ground distance. Boundaries represented at these scales are indicative of broad, regional trends and should not be interpreted as site specific.