McGuire, V.L. 2009 vector digital data U.S. Geological Survey Scientific Investigations Report 2009-5019 Reston, VA U.S. Geological Survey http://water.usgs.gov/lookup/getspatial?sir09-5019_hpwlcpd07 McGuire, V.L. 2009 document U.S. Geological Survey Scientific Investigations Report 2009-5019 Reston, VA U.S. Geological Survey http://pubs.usgs.gov/sir/2009/5019/ This data set consists of digital water-level-change contours for the High Plains aquifer in the central United States, predevelopment (about 1950) to 2007. The High Plains aquifer extends from south of 32 degrees to almost 44 degrees north latitude and from 96 degrees 30 minutes to 104 degrees west longitude. The aquifer underlies about 174,000 square miles in parts of Colorado, Kansas, Nebraska, New Mexico, Oklahoma, South Dakota, Texas, and Wyoming. This digital data set was created using water-level measurements from 3,643 wells measured in both predevelopment and 2007. The water-level-change contours were initially generated programmatically and then modified manually. The map was reviewed with the relevant data at a scale of 1:1,000,000. This data set was created to document the map of water-level changes, predevelopment to 2007, (fig. 1; McGuire, V.L., 2009) and to make available the data on this map for use with geographic information systems. 1950 2007 2007 Complete None planned -106.016204 -96.228541 43.806318 31.645653 None aquifers ground water groundwater High Plains aquifer Ogallala aquifer Ogallala Formation water-level change ISO 19115 Topic Category inlandWaters geoscientific information None western U.S. Geographic Names Information System (GNIS) High Plains Great Plains none These data are not to be used at scales greater than 1:1,000,000. McGuire, V.L. U.S. Geological Survey Hydrologist mailing address

5231 South 19th Street

Lincoln NE 68512 USA (402)328-4100 (402)328-4101 Webmaster@ne20dnelnc.cr.usgs.gov http://water.usgs.gov/GIS/browse/sir09-5019_hpwlcpd07.gif Illustration of the dataset. GIF McGuire, V.L. Public Unclassified None Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 2; ESRI ArcCatalog 9.2.6.1500 McGuire, V.L. 2009 map U.S. Geological Survey Scientific Investigations Report 2009-5019 Reston, VA U.S. Geological Survey McGuire, V.L. 2009 document U.S. Geological Survey Scientific Investigations Report 2009-5019 Reston, VA U.S. Geological Survey http://pubs.usgs.gov/sir/2009/5019/ The attributes were visually checked for verification with the change in measured water levels in the wells. Summary statistics were run on the total area of each range to be sure the range labels were correct. There were not polygons with missing water-level change attributes. Polygon topology is present. The Arc/Info Workstation Labelerrors command was used to verify that each polygon had one and only one label point. The density of wells with predevelopment, 2005, 2006, and 2007 water-level data varies greatly across the map area. The accuracy of the water-level change contours in a given area is related directly to the density and availability of wells with water-level data in that area. This data set is the water-level-change polygons produced by McGuire (2009) in U.S. Geological Survey Scientific Investigations Report 2009-5019. The data represented is for the time period from about 1950 to 20007 only. The data set was generated for the area within the High Plains aquifer only. The approximate horizontal accuracy was derived by estimating the average distances between wells with water-level data in the area; this estimate is 3 miles. Cederstrand, J.R. Heimes, F.J. Krothe, N.C. Luckey, R.R. Weeks, J.B. Becker, M.F. 1999 vector digital data U.S. Geological Survey Open-File Report 99-263 Reston, VA U.S. Geolical Survey http://water.usgs.gov/GIS/metadata/usgswrd/XML/ofr99-263.xml Gutentag, E.D. Heimes, F.J. Krothe, N.C. Luckey, R.R. Weeks, J.B. 1984 U.S. Geological Survey Professional Paper 1400B Reston, VA U.S. Geological Survey http://pubs.er.usgs.gov/usgspubs/pp/pp1400B 1000000 online 1999 1980 Water-level changes, predevelopment to 1980 Map of water-level changes in the High Plains aquifer, predevelopment to 1980. Lowry, M.E. Crist, M.A. Tilstra, J.R. 1967 document U.S. Geological Survey Water-Supply Paper 1834 Reston, VA U.S. Geological Survey http://pubs.er.usgs.gov/usgspubs/wsp/wsp1834 150000 paper 1967 publication date Water-level changes, Laramie County, WY Water-level changes, Laramie County, WY, predevelopment to 1967 Luckey, R.R. Gutentag, E.D. Weeks, J.B. 1981 map U.S. Geological Survey Hydrologic Investigations Atlas HA-652 Reston, VA U.S. Geological Survey http://pubs.er.usgs.gov/usgspubs/ha/ha652 2500000 paper 1981 1980 Water-level and saturated-thickness changes, predevelopment to 1980 Water-level, predevelopment to 1980 Burbach, M.E. 2007 view Lincoln, NE University of Nebraska-Lincoln, School of Natural Resources, Conservation and Survey Division http://snr5.unl.edu/csd-esic/GWMapArchives/2007GWMaps/Pred-2007.jpg 500000 online 2007 2007 Water-level changes in Nebraska, presettlement to spring 2007 Water-level changes in Nebraska, presettlement to spring 2007. Water-level-change data for 3,643 wells were reviewed and then printed with the aquifer boundary (Sharon Qi., U.S. Geological Survey, written commun., 2006), internal areas where the aquifer is not present, and areas where the aquifer has little or no saturated thickness (modified from Gutentag and others, 1984). A raster of the water-level-change data was generated using Arc/Info inverse weighted distance (IDW) function, then the raster was converted into polygons using the reclass and gridpoly functions. The programmatically generated polygons were modified on-screen using other supporting water-level data in the background. The other supporting water-level data included 1) wells measured in predevelopment and in 2004-06, but not measured in 2007; 2) wells measured before June 15, 1978 (but not during or before the predevelopment period for the area), and in 2007; 3) wells measured in 1980 and 2007 and published maps of water-level changes, predevelopment to 1980; and 4) for parts of the aquifer in Nebraska and Wyoming with few predevelopment water levels, published maps of water-level changes since predevelopment (about 1950) or presettlement (before any groundwater development, in some areas, before 1900). 200809 Compared the polygon range to the value of water-level change, predevelopment to 2007, associated with each well, and ran the Arc/Info Labelerrors command on the data set to ensure all polygons had labels. Ran the Arc/Info Renode command to number nodes sequentially. 200809 The water-level change contours were compared to published reports. The water-level change contours were reviewed by hydrogeologists familiar with the geographic area--Greg Steele, Cristi Hansen, Kathy Neitzert (SD only), Ken Watts (CO only), Dana Barbie (TX only), Greg Boughton (WY only), Dave Lutz (TX only), and S. Jerrod Smith (OK only), Janet Carter, and Keith Lucey, all with the U.S. Geological Survey, and Janie Hopkins (TX only), with the Texas Water Development Board. The comments from the reviewers were incorporated into the map. 200912 Generated metadata for the map of water-level changes, predevelopment to 2007, after the associated U.S. Geological Survey Scientific Investigations Report 2009-5019 was approved. 200902 Metadata imported. Z:\hp07\gis\wldata\hpwlcpd07_after_lv1_mrjohn.xml 20090403 14410700 Vector Complete chain 1153 Label point 478 GT-polygon composed of chains 478 Point 32 Albers Conical Equal Area 29.500000 45.500000 -96.000000 23.000000 0.000000 0.000000 coordinate pair 0.000256 0.000256 meters North American Datum of 1983 Geodetic Reference System 80 6378137.000000 298.257222 Local surface 0.5 feet Attribute values hpwlcpd07.pat Water-level changes in the High Plains aquifer, predevelopment to 2007 U.S. Geological Survey AREA Area of feature in internal units squared. ESRI Positive real numbers that are automatically generated. PERIMETER Perimeter of feature in internal units. ESRI Positive real numbers that are automatically generated. WLCPD07# Internal feature number. ESRI Sequential unique whole numbers that are automatically generated. WLCPD07-ID User-defined feature number. ESRI Sequential unique whole numbers that are automatically generated. RANGE Range is the polygon's water-level change range in feet or a value to indicate the polygon is an internal area where the aquifer is not present. U.S. Geological Survey > +50 Water-level rise greater than 50 feet U.S. Geological Survey +25 to +50 Water-level rise from 25 to 50 feet U.S. Geological Survey -10 to +10 Water-level change from a decline of 10 feet to a rise of 10 feet U.S. Geological Survey -10 to -25 Water-level decline from 10 to 25 feet U.S. Geological Survey -25 to -50 Water-level decline from 25 to 50 feet U.S. Geological Survey -50 to -100 Water-level decline from 50 to 100 feet U.S. Geological Survey -100 to -150 Water-level decline from 100 to 150 feet U.S. Geological Survey < -150 Water-level decline greater than 150 feet U.S. Geological Survey islands Internal area where the aquifer is not present U.S. Geological Survey 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 Downloadable Data 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. ARCE Arc 9.3 Full coverage WinZip (WinZip is a Registered Trademark of WinZip International LLC) 2.3 MBytes http://water.usgs.gov/GIS/dsdl/sir09-5019_hpwlcpd07_e00.zip Download from web shapefile ESRI Arc 9.3 Full coverage WinZip (WinZip is a Registered Trademark of WinZip International LLC) 2.7 http://water.usgs.gov/GIS/dsdl/sir09-5019_hpwlcpd07_shp.zip None. This dataset is provided by USGS as a public service. 20090413 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+sir09-5019_hpwicpd07 FGDC Content Standards for Digital Geospatial Metadata FGDC-STD-001-1998 None Unclassified Not applicable