Cederstrand, Joel R. Becker, Mark F. 1999 1.0 map Open-File Report OFR99-264 Reston, VA U.S. Geological Survey http://water.usgs.gov/lookup/getspatial?ofr99-264 This digital data set consists of contours for predevelopment water-level elevations 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 created by digitizing the contours for predevelopment water-level elevations from a 1:1,000,000-scale 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 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 digital contours of predevelopment water-level elevations 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. Elevation refers to distance above sea level and sea level refers to the National Geodetic Vertical Datum of 1929 (NGVD29)-- a geodetic datum derived from a general adjustment of the first-order level nets of both the United States and Canada, formerly called Sea Level Datum of 1929. 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 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. This digital data set was created by digitizing the contours for predevelopment water-level elevations from a 1:1,000,000-scale base map created by the High Plains RASA project (Gutentag and others, 1984). 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. 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 -105.46697315 -96.47898317 43.57658376 31.81224042 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/ofr99-264.gif A browse image of the predevelopment water level 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) Chain-node topology present. This data set includes the contours for predevelopment water-level elevations published by Gutentag and others (1984) in U.S. Geological Survey Professional Paper 1400-B. None None. A mylar map of the contours for predevelopment water levels was digitized using ARC/INFO. 199704010000 -- 199705150000 The coverage had been incorrectly registered because the easternmost tics used in digitizing were one degree longitude too far east of the actual tics. The coverage was adjusted using the ARC/INFO TRANSFORM command. 199710231609 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 projection origin of 23 degrees north latitude. 199710231609 The coverage including features and attributes was checked and corrected, where necessary, using ARC/INFO. The MAJOR1, MINOR1, and ELEV arc attributes were added and calculated. 199801281449 -- 199803051223 Arcs were clipped to aquifer boundary and outside of outcrops and areas of little or no saturated thickness. 199810051418 -- 199810091234 The coverage was projected from Albers Equal-Area projection to decimal degrees with the 1983 North American Datum using ARC/INFO. 199903231320 Vector String 466 0.0000101459049 0.0000101459049 Decimal Degrees North American Datum of 1983 GRS1980 6378206.4 294.98 PREDWLV.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 PREDWLV# Internal feature number Computed Sequential unique positive integer n/a n/a PREDWLV-ID User-assigned feature number User-defined Integer n/a n/a ELEV Predevelopment water levels in feet Gutentag and others, 1984 1200, 1300, 1400, 1500, 1600, 1700, 1800, 1900, 2000, 2100, 2200, 2300, 2400, 2500, 2600, 2700, 2800, 2900, 3000, 3100, 3200, 3300, 3400, 3500, 3600, 3700, 3800, 3900, 4000, 4100, 4200, 4300, 4400, 4500, 4600, 4700, 4800, 4900, 5000, 5100, 5200, 5300, 5400, 5500, 5600, 5700, 5800, 5900, 6000, 6100, 6200, 6300, 6400, 6500, 6600, 6700, 6800, 6900, 7000, 7100, 7200 n/a n/a MAJOR1 Predevelopment water levels in feet Gutentag and others, 1984 1200, 1300, 1400, 1500, 1600, 1700, 1800, 1900, 2000, 2100, 2200, 2300, 2400, 2500, 2600, 2700, 2800, 2900, 3000, 3100, 3200, 3300, 3400, 3500, 3600, 3700, 3800, 3900, 4000, 4100, 4200, 4300, 4400, 4500, 4600, 4700, 4800, 4900, 5000, 5100, 5200, 5300, 5400, 5500, 5600, 5700, 5800, 5900, 6000, 6100, 6200, 6300, 6400, 6500, 6600, 6700, 6800, 6900, 7000, 7100, 7200 n/a n/a MINOR1 0 n/a 0 n/a n/a Each line has associated attributes of ELEV and MAJOR1 containing values of predevelopment water levels expressed in feet. See overview. 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://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/ofr99-264.e00.gz Other DLG file format zipped 1 http://water.usgs.gov/GIS/dsdl/ofr99-264.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+ofr99-264 FGDC Content Standards for Digital Geospatial Metadata FGDC-STD-001-1998