Cederstrand, Joel R. Becker, Mark F. 1998 1.0 map Open-File Report OFR98-414 Reston, VA U.S. Geological Survey http://water.usgs.gov/lookup/getspatial?ofr98-414 This digital data set consists of specific yield percentage contours and polygons 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 almost 106 degrees west longitude. The outcrop area covers 174,000 square miles and is present in Colorado, Kansas, Nebraska, New Mexico, Oklahoma, Texas, South Dakota, and Wyoming. This digital data set was created by digitizing the specific yield percentage contours from a 1:1,000,000 base map created by the U.S. Geological Survey High Plains Regional Aquifer-System Analysis (RASA) project (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.) The data should not be used 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 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 digital specific yield percentage contours 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. About 170,000 wells pumped water from the aquifer to irrigate about 13 million acres in the High Plains in 1980. The High Plains aquifer is a regional water-table aquifer consisting mostly of near-surface sand and gravel deposits. In 1980, the maximum saturated thickness of the aquifer was about 1,000 feet and averaged 200 feet. The specific yield is the ratio of the water volume, which the rock or soil, after saturation, would yield by gravity to the volume of the rock or soil (Lohman and others, 1972, p. 12). 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 widely 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 were used as hydrologic boundaries of Quaternary deposits and physiographic provinces in eastern Nebraska. This digital data set was created by digitizing the specific yield percentage contours from a 1:1,000,000 base map created by the High Plains RASA project (Gutentag and others, 1984). The High Plains aquifer boundary had been digitized previously (McGrath and Dugan, 1993). 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 map to verify the linework and attributes. The reviewers checked the metadata file 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. Lohman, S.W., Bennett, R.R., Brown, R.H., Cooper, Jr., H.H., Drescher, W.J., Ferris, J.G.,Johnson, A.I., McGuiness, C.L., Piper, A.M., Rorabaugh, M.I., Stallman, R.W., and Theis, C.V., 1972, Definitions of selected ground-water terms -- revisions and conceptual refinements: U.S. Geological Survey Water-Supply Paper 1988, 21 p. McGrath, Timothy, and Dugan, J.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. 1998 1980 Complete None planned -104.542 -96.305 43.806 31.652 none aquifers ground water groundwater High Plains aquifer Ogallala Formation Ogallala aquifer aquifer boundary specific yield 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/ofr98-414.gif A browse image of High Plains aquifer specific yield data set. 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 specific yield percentage contours published by Gutentag and others (1984) in U.S. Geological Survey Professional Paper 1400-B. None 254 meters Resolution as reported None. A mylar map of the specific yield percentage contours was digitized using AUTOCAD and then converted to ARC/INFO. 199711131216 -- 199801081535 The coverage was projected from Lambert Conformal Conic projection with the 1927 North American Datum to an Albers Equal-Area projection with the 1983 North American Datum using ARC/INFO. The new projection has standard parallels of 29 degrees 30 minutes and 45 degrees 30 minutes north latitude, a central meridian of 96 degrees west longitude, and a latitude of projection origin of 23 degrees north latitude. 199802101347 The coverage including features and attributes was checked and corrected, where necessary, using ARC/INFO. The DXF-ELEVATION attribute values were transferred to the PERCENTAGE attribute and DXF-ELEVATION was dropped. The MAJOR1 and MINOR1 arc attributes and RANGE, MAJOR1, and MINOR1 polygon attributes were added and calculated. 199802101617 -- 199803191137 The source map displayed several contours that were not percentage boundaries. These contours were deleted from the coverage. 199803191138 -- 199803191337 Vector Point 978 String 1497 GT-polygon composed of chains 979 Albers Conical Equal Area 29.5 45.5 -96 23 0.0 0.0 coordinate pair 200 meters 200 meters METERS North American Datum of 1983 Geodetic Reference System 80 6378137 298.257 SY.PAT Polygon attribute table of SY ARC/INFO - Polygon attribute table of SY 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 SY# Internal feature number Computed Sequential unique positive integer n/a n/a SY-ID User-assigned feature number User-defined Integer n/a n/a RANGE Range of specific yield percentage Gutentag and others, 1984 -1, 0 to 5, 5 to 10, 10 to 15, 15 to 20, 20 to 25, 25 to 30 n/a n/a MAJOR1 Lower limit of range of specific yield percentage Gutentag and others, 1984 0, 5, 10, 15, 20, 25, 30 n/a n/a MINOR1 Upper limit of range of specific yield percentage Gutentag and others, 1984 0, 5, 10, 15, 20, 25, 30 n/a n/a SY.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 SY# Internal feature number Computed Sequential unique positive integer n/a n/a SY-ID User-assigned feature number User-defined Integer n/a n/a PERCENTAGE Specific yield percentage Gutentag and others, 1984 0, 5, 10, 15, 20, 25 n/a n/a MAJOR1 Specific yield percentage Gutentag and others, 1984 0, 5, 10, 15, 20, 25 n/a n/a MINOR1 0 n/a 0 n/a n/a Each line in this data set has associated attributes of PERCENTAGE and MAJOR1 containing percentages of specific yield. Lines with PERCENTAGE and MAJOR1 values of zero are parts of the High Plains aquifer boundary. Each polygon in this data set has an associated attribute, RANGE, containing ranges of specific yield percentages. For example, a polygon with a RANGE value of '5 to 10', has a specific yield between 5 and 10 percent. Polygons in this data set that contain a RANGE value of -1 represent aquifer outcrops where the specific yield is not known. MAJOR1 contains the lower RANGE limit and MINOR1 contains the upper RANGE limit. See overview. U.S. Geological Survey, Branch of Information Services mailing address

Box 25286

Denver Federal Center Colorado 80225-0286 United States of America 1-888-275-8747 8 AM to 4 PM Mountain Time Zone, Monday through Friday Open-File Reports on diskette. OFR 98-414 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/ofr98-414.e00.gz Other DLG file format zipped 1 http://water.usgs.gov/GIS/dsdl/ofr98-414.dlg.gz None. This dataset is provided by USGS as a public service. 20041108 U.S. Geological Survey Ask USGS -- Water Webserver Team mailing

445 National Center

Reston VA 20192 1-888-275-8747 (1-888-ASK-USGS) http://answers.usgs.gov/cgi-bin/gsanswers?pemail=h2oteam&subject=GIS+Dataset+ofr98-414 FGDC Content Standards for Digital Geospatial Metadata FGDC-STD-001-1998