V.L. McGuire K.D. Lund B.K. Densmore 2012 raster digital data U.S. Geological Survey Scientific Investigations Report USGS SIR 2012-5177 Reston, VA U.S. Geological Survey http://water.usgs.gov/lookup/getspatial?sir12-5177_hp_wlc8095 V.L. McGuire K.D. Lund B.K. Densmore 2012 document U.S. Geological Survey Scientific Investigations Report USGS SIR 2012-5177 Reston, VA U.S. Geological Survey http://pubs.er.usgs.gov/publication/sir20125177 This raster data set represents water-level change in the High Plains aquifer of the United States from 1980 to 1995, in feet. The High Plains aquifer underlies 112.6 million acres (176,000 square miles) in parts of eight States: Colorado, Kansas, Nebraska, New Mexico, Oklahoma, South Dakota, Texas, and Wyoming. The aquifer's saturated thickness ranges from near zero to about 1,200 feet (Weeks and Gutentag, 1981). Water-level declines occurred in parts of the High Plains aquifer soon after the onset of substantial irrigation with groundwater (about 1950) (Luckey and others, 1981; Gutentag and others, 1984). This data set was generated in ESRI ArcInfo Workstation Version 9.3, which is a geographic information system (GIS), using water-level-change data from wells measured in 1980 and 1995 and from some additional wells in New Mexico, which were measured in 1996 and 1997. For this data set, areas of no substantial change were designated as areas where water-level change was between a rise of 3 feet and and decline of 3 feet; the raster was set to zero in the areas of no substantial change. REFERENCES CITED -- 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. Luckey, R.R., Gutentag, E.D., and Weeks, J.B., 1981, Water-level and saturated-thickness changes, predevelopment to 1980, in the High Plains aquifer in parts of Colorado, Kansas, Nebraska, New Mexico, Oklahoma, South Dakota, Texas, and Wyoming: U.S. Geological Survey Hydrologic Investigations Atlas HA-652, 2 sheets, scale 1:2,500,000. Weeks, J.B., and Gutentag, E.D., 1981, Bedrock geology, altitude of base, and 1980 saturated thickness of the High Plains aquifer in parts of Colorado, Kansas, Nebraska, New Mexico, Oklahoma, South Dakota, Texas, and Wyoming: U.S. Geological Survey Hydrologic Investigations Atlas HA-648, 2 sheets, scale 1:2,500,000. This data set was created to document the distribution of water-level change in the High Plains aquifer from 1980 to 1995 and to make available the data on this map for use with geographic information systems. This data set was generated at the request of the U.S. Department of Agriculture, Farm Service Agency. This raster data set is associated with a U.S. Geological Survey Scientific Investigations Report (McGuire and others, 2012), which describes the methods used to generate this raster data set (Water-level change, High Plains aquifer, 1980 to 1995) and the following related raster data sets: Water-level change, High Plains aquifer, 1995 to 2000 Water-level change, High Plains aquifer, 2000 to 2005 Water-level change, High Plains aquifer, 2005 to 2009 Saturated thickness, High Plains aquifer, 2009 Specific yield, High Plains aquifer 2011 publication date Complete Not specified -106.016217 -96.225303 43.806420 31.598356 None aquifers groundwater ground water High Plains aquifer Ogallala aquifer water-level change ISO 19115 Topic Category geoscientificInformation inlandWaters None High Plains Great Plains Colorado Kansas Nebraska New Mexico Oklahoma South Dakota Texas Wyoming None 1980 to 1995 None This data has a resolution of 500 meters and should not be used for more detailed analysis. U.S. Geological Survey V.L. McGuire Hydrologist mailing address

5231 South 19th Street

Lincoln NE 68512 USA (402)328-4126 vlmcguir@usgs.gov http://water.usgs.gov/GIS/browse/hp_wlc8095.jpg Illustration of the dataset. JPG The water-level data used to map water-level changes was provided by numerous Federal, State, and local entities. Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 3; ESRI ArcCatalog 9.3.1.3000 V.L. McGuire K.D. Lund B.K. Densmore 2012 U.S. Geological Survey Scientific Investigations Report USGS SIR 2012-5177 Reston, VA U.S. Geological Survey See Entitly Attribute information. Not applicable for raster data. Data set is complete for the High Plains areas. Data gaps within the High Plains boundary indicate areas where the aquifer is not present. The data set has a horizontal resolution of 500 meters. U.S. Geological Survey 2011 tabular digital data http://ne.water.usgs.gov/ogw/hpwlms/data.html online 2011 ground condition HPWLMS-website-data Provides water-level data for wells screened in the High Plains aquifer. Sharon L. Qi 2010 vector digital data Digital Data Series 543 Reston, VA U.S. Geological Survey http://pubs.usgs.gov/ds/543/ online 2010 publication date U.S. Geological Survey DS-543 A update to the boundary of the High Plains aquifer and the boundary of internal areas where the aquifer is not present. This is an update of the boundary presented in U.S. Geological Survey PP-1400-B. E.D. Gutentag F.J. Heimes N.C. Krothe R.R. Luckey J.B. Weeks 1984 map Professional Paper 1400-B Reston, VA U.S. Geological Survey http://pubs.er.usgs.gov/publication/pp1400B paper 1984 publication date U.S. Geological Survey PP-1400-B Boundary of the High Plains aquifer and boundary of internal areas where the aquifer is not present. B.C. Fischer V.L. McGuire 1999 vector digital data Open-File Report 99-197 Reston, VA U.S. Geological Survey http://water.usgs.gov/GIS/metadata/usgswrd/XML/ofr99-197_wlc80_95.xml online 1997 ground condition U.S. Geological Survey OFR 99-197 These 1980-to-1995 water-level-change contours were one of the inputs to the ESRI ArcInfo Workstation Version 9.3 topogrid command and were used to control the ESRI ArcInfo Workstation Version 9.3 topogrid interpolation process. The following data and data sets were assembled: (1) water-level-change data from wells screened in the High Plains aquifer and measured in both nominal date 1980 and nominal date 1995 (available for download on the U.S. Geological High Plains aquifer water-level monitoring study site at http://ne.water.usgs.gov/ogw/hpwlms/); (2) the aquifer boundary and the boundary of internal areas where the aquifer is not present (Qi, 2010); (3) published contours of water-level change, 1980 to 1995 (Fischer and McGuire, 1997). HPWLMS-website-data U.S. Geological Survey DS-543 U.S. Geological Survey OFR 99-197 2011 The ESRI ArcInfo Workstation Version 9.3 topogrid command was used to interpolate the water-level change, 1980 to 1995 (Fischer and McGuire, 1997) using the (1) the aquifer boundary (Qi, 2010), (2) water-level change data from wells (HPWLMS-website-data; attribute titled fsa_delta80_95), (3) the extent of the internal areas where the aquifer is not present (Qi, 2010), and (4) published contour of water-level change, 1980 to 1995, to generate an intermediate raster of the data (in feet). Then the ESRI ArcInfo Workstation Version 9.3 grid contour command was used to contour this raster for the following ranges (in feet): -40 and less, -40 to -20, -20 to -10, -10 to -5, -5 to -3, -3 to 3, 3 to 5, 5 to 10, 10 to 20, and 20 and greater. These contours were manually modified in areas with few water-level-change data values to limit the effects of isolated data values on the contours in those areas. Polygons were generated from the contours using the ESRI ArcInfo Workstation Version 9.3 build command and the polygons for the areas of water-level change from 3 feet to -3 feet were attributed with a field titled "startval" with a value of one. HPWLMS-website-data U.S. Geological Survey DS-543 U.S. Geological Survey OFR 99-197 2011 The aquifer boundary (Qi, 2010) was converted to a data point coverage titled aq_only_pt using the ESRI ArcInfo Workstation Version 9.3 command densify; An attribute, beginval, was added to the points of the aquifer boundary, and beginval was set equal to zero for all the points to reflect that there is little water-level change data at the aquifer boundary. U.S. Geological Survey DS-543 2011 The ESRI ArcInfo Workstation Version 9.3 grid command polygrid was used to generate a raster titled g02_aqisle with the cells equal to one in the internal areas were the aquifer is not present (Qi, 2010). U.S. Geological Survey DS-543 2011 The ESRI ArcInfo Workstation Version 9.3 grid command polygrid was used to create a raster of the areas of water-level change between a rise of 1 foot and a decline of 1 foot (modified from Fischer and McGuire, 1997). The value of the raster, titled v_nsc8095_g, is one in these areas and zero elsewhere. U.S. Geological Survey OFR 99-197 2011 The ESRI ArcInfo Workstation Version 9.3 topogrid command was used to interpolate the water-level change, 1980 to 1995, and generate a final raster of the data (in feet). Inputs to the topogrid command were (1) water-level-change data from wells screened in the High Plains aquifer and measured in both nominal date 1980 and nominal date 1995 (available for download on the U.S. Geological Survey High Plains aquifer water-level monitoring study site at http://ne.water.usgs.gov/ogw/hpwlms/); (2) the aquifer boundary and the boundary of internal areas where the aquifer is not present (Qi, 2010), (3) the contours of water-level change from Process Step 2. Topogrid was run with boundary equal to aq_only; point fsawell8095, attribute fsa_delta80_95; aq_only_pt, attribute beginval; contour v_wlc8095_ap, attribute contour; tolerances set to zero for tolerance 1, one for horizontal standard error, and zero for vertical standard error and with 15 iterations. The output topogrid raster was titled k_ga18a_8095, which is input to the next process. HPWLMS-website-dataU.S. Geological Survey DS-543 2011 The ESRI ArcInfo Workstation Version 9.3 grid command setnull was used to generate a new raster, titled k_ga18b_8095, with cell values equal to k_ga18a_8095 except in cells located in the internal areas within the aquifer boundary where the aquifer is not present (raster g02_aqisle); in these areas the cell value was set to null. U.S. Geological Survey DS-543 2011 The ESRI ArcInfo Workstation Version 9.3 grid command con was used to generate a new raster, titled k_ga18c_8095, with cell values equal to k_ga18b_8095, except in areas where contoured water-level change was between a rise of one foot and a decline of one foot (raster v_nsc8095_g); in these areas, the cell value was set to zero. This procedure was used because in much of the area where change is between a rise of 1 foot and decline of 1 foot, there is little available water-level-change data. 2011 Raster Grid Cell 2659 1569 1 Albers Conical Equal Area 29.500000 45.500000 -96.000000 23.000000 0.000000 0.000000 row and column 500.000000 500.000000 meters North American Datum of 1983 Geodetic Reference System 80 6378137.000000 298.257222 The values of the raster data set represent water-level change in the High Plains aquifer from 1980 to 1995, in feet. The cell values for water-level change, 1980 to 1995, range from a decline of 82 feet to a rise of 46 feet. This raster data set is associated with the report (McGuire and others,2012) titled "Saturated thickness and water in storage in the High Plains aquifer, 2009, and water-level changes and changes in water in storage in the High Plains aquifer, 1980 to 1995, 1995 to 2000, 2000 to 2005, and 2005 to 2009." U.S. Geological Survey Ask USGS ? Water Webserver Team mailing address

445 National Center

Reston VA 20192 USA 1-888-275-8747 (1-888-ASK-USGS) http://answers.usgs.gov/cgi-bin/gsanswers?pemail=h2oteam&subject=GIS+Dataset+sir12-5177_hp_wlc8095 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. ArcInfo Workstation GRID spatial and attribute information zip -d; unzip 2769 kilobytes http://water.usgs.gov/GIS/dsdl/hp_wlc8095.zip None ASCII spatial and attribute information zip -d; unzip 3174 kilobytes http://water.usgs.gov/GIS/dsdl/hp_wlc8095a.zip None None. This dataset is provided by USGS as a public service. 11012011 20111229 U.S. Geological Survey Ask USGS - Water Webserver Team mailing address

5231 South 19th Street

Lincoln NE 68512 USA 1-800-275-8747 (1-888-ASK-USGS) http://water.usgs.gov/user_feedback_form.html FGDC Content Standards for Digital Geospatial Metadata FGDC-STD-001-1998