Cederstrand, Joel R. Becker, Mark F. 1999 1.0 map Open-File Report OFR99-267 Reston, VA U.S. Geological Survey http://water.usgs.gov/lookup/getspatial?ofr99-267 This digital data set consists of aquifer boundaries for the High Plains aquifer in the central United States. The High Plains aquifer extends from south of 32 degrees to almost 44 degrees north latitude and from 96 degrees 30 minutes to 106 degrees west longitude. The outcrop area covers 174,000 square miles and is present in Colorado, Kansas, Nebraska, New Mexico, Oklahoma, South Dakota, Texas, and Wyoming. This digital data set was compiled from a digital coverage that was created for publication of paper maps in McGrath and Dugan (1993, Water-level changes in the High Plains aquifer -- predevelopment to 1991: U.S. Geological Survey Water-Resources Investigations Report 93-4088, 53 p.) The data are not intended for use at scales larger than 1:1,000,000. This data set was created to archive the original map produced by the High Plains RASA project and make available the data on those maps for use with geographic information systems. Introduction -- The information provided in the introduction is found in U.S. Geological Survey Professional Paper 1400-B (Gutentag and others, 1984). This data set consists of the aquifer boundary for the High Plains aquifer in the United States. The High Plains aquifer, which underlies about 174,000 square miles in parts of eight states, is the principal water source in one of the nation's major agricultural areas. In 1980, about 170,000 wells pumped water from the aquifer to irrigate about 13 million acres. The High Plains aquifer is a regional water-table aquifer consisting mostly of near-surface sand and gravel deposits. The maximum saturated thickness of the aquifer in 1980 was about 1,000 feet and averaged 200 feet. Hydraulic conductivity and specific yield were highly variable because of the heterogeneity of the aquifer. Hydraulic conductivity and specific yield of the aquifer depend on sediment types, which vary significantly both horizontally and vertically. Hydraulic conductivity ranged from less than 25 to greater than 300 feet per day and averaged 60 feet per day. Specific yields ranged from less than 10 to 30 percent and averaged about 15 percent. The High Plains aquifer boundaries were determined by the erosional extent of the High Plains aquifer and hydrologic boundaries where the High Plains aquifer extends eastward from the Great Plains physiographic province (Fenneman, 1931). In most of the area the erosional extent of hydraulically connected Tertiary and Quaternary rocks were used. Streams and physiographic provinces in eastern Nebraska were used as hydrologic boundaries of Quaternary deposits. 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 for checking against the source maps to verify the linework and attributes. The reviewers checked the metadata files for completeness and accuracy. Related Spatial and Tabular Data Sets -- Other References Cited -- Fenneman, N.M., 1931, Physiography of western United States (1st ed.): New York, McGraw-Hill, 534 p. Gutentag, E.D., Heimes, F.J., Krothe, N.C., Luckey, R.R., and Weeks, J.B., 1984, Geohydrology of the High Plains aquifer in parts of Colorado, Kansas, Nebraska, New Mexico, Oklahoma, South Dakota, Texas, and Wyoming: U.S. Geological Survey Professional Paper 1400-B, 63 p. McGrath, Timothy and Dugan, Jack T., 1993, Water-level changes in the High Plains aquifer -- predevelopment to 1991: U.S. Geological Survey Water-Resources Investigations Report 93-4088, 53 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 Complete None planned -105.92091073 -96.29377645 43.66316552 31.80397248 none aquifers ground water groundwater High Plains aquifer Ogallala Formation Ogallala aquifer aquifer boundary inlandWaters none High Plains Great Plains region western U.S. None. None Mark F. 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 mfbecker@usgs.gov none http://water.usgs.gov/GIS/browse/ofr99-267.gif A browse image of the aquifer boundary data set for the High Plains aquifer. GIF None 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 entire aquifer boundary published by Gutentag and others (1984) in U.S. Geological Survey Professional Paper 1400-B. None. None. Lines representing the aquifer boundaries were selected from a digital geologic coverage (McGrath and Dugan, 1993) and combined using ARC/INFO. 198806291037 -- 199608081543 The coverage including features and attributes was checked and corrected, where necessary, using ARC/INFO. 199801291709 -- 199803301242 The coverage was projected from Albers Equal-Area projection to decimal degrees with the 1983 North American Datum using ARC/INFO. 199903231320 Vector Point 39 String 51 GT-polygon composed of chains 40 0.0000101460904 0.0000101460904 Decimal Degrees North American Datum of 1983 GRS1980 6378206.4 294.98 AQBOUND.PAT Polygon attribute table of AQBOUND ARC/INFO - Polygon attribute table of AQBOUND 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 AQBOUND# Internal feature number Computed Sequential unique positive integer n/a n/a AQBOUND-ID User-assigned feature number User-defined Integer n/a n/a OUTCROP User-defined feature number User-defined 0,1 n/a n/a MAJOR1 polytype User-defined 0,1 n/a n/a MINOR1 User-defined feature number User-defined 0 n/a n/a AQBOUND.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 AQBOUND# Internal feature number Computed Sequential unique positive integer n/a n/a AQBOUND-ID User-assigned feature number User-defined Integer n/a n/a Each polygon has associated attributes of OUTCROP and MAJOR1 containing values of either "0", or "1". When the OUTCROP value is "0", the polygon is part of the aquifer. When the OUTCROP value is "1", the polygon is not part of the aquifer. 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://water.usgs.gov/user_feedback_form.html 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/ofr99-267.e00.gz Other DLG file format zipped 1 http://water.usgs.gov/GIS/dsdl/ofr99-267.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+ofr99-267 FGDC Content Standards for Digital Geospatial Metadata FGDC-STD-001-1998