Flynn, Jennifer L., Arnold, L. Rick, and Paschke, Suzanne S. 2009 raster digital data Reston, VA U.S. Geological Survey http://water.usgs.gov/lookup/getspatial?ds472_sat Arnold, L.R., Flynn, J.L., and Paschke, S.S. 2009 USGS Data Series Data Series 472 http://pubs.usgs.gov/ds/472/ These data are in support of report DS 472 (Arnold and others, 2009). This data set represents the saturated thickness of the High Plains aquifer within Colorado. The water levels used in generating the water-table data were collected from High Plains wells in the year 2000. Saturated thickness was derived by subtracting aquifer-base elevation from water-table elevation. Design a network to sample ground water for agricultural chemicals in areas of agricultural irrigation in the High Plains Aquifer in Colorado. Work done in cooperation with the Colorado Department of Agriculture. Arnold, L.R., Flynn, J.L., and Paschke, S.S., 2009, Design and Installation of a Groundwater Monitoring-Well Network in the High Plains Aquifer, Colorado: U.S. Geological Survey Data Series 456. McGuire, V.L., Johnson, M.R., Schieffer, R.L., Stanton, J.S., Sebree, S.K., and Verstraeten, I.M., 2003, Water in storage and approaches to ground-water management, High Plains aquifer, 2000: U.S. Geological Survey Circular 1243, 51 p. McMahon, P.B., Dennehy, K.F., Bruce, B. W., Gurdak, J.J., and Qi, S.L., 2007, Water-quality assessment of the High Plains Aquifer, 1999-2004: U.S. Geological Survey Professional Paper 1749, 136 p. 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, scale 1:2,500,000, 2 sheets. 2000 ground condition Complete None planned -105.331299 -101.549922 41.545378 36.788579 None High Plains Aquifer Saturated thickness inlandWaters None Eastern Colorado USA United States of America None None. Users of this geospatial database and geologic information derived there from should acknowledge the U.S. Geological Survey as the source of the data. U.S. Geological Survey Ask USGS -- Water Webserver Team mailing address

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Reston VA 90192 USA 1-888-275-8747 (1-888-ASK-USGS) http://answers.usgs.gov/cgi-bin/gsanswers?pemail=h2oteam&subject=GIS+Dataset+ds472_sat Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 3; ESRI ArcCatalog 9.2.6.1500 US Geological Survey, Colorado Water Science Center 2009 Data Series 456 US Geological Survey 2003 Circular 1243 US Geological Survey 2007 Professional Paper 1749 US Geological Survey 1981 Hydrologic Investigations Atlas 648 Checked against 2000 depth to water data, ground surface elevation, and base of aquifer. Complete in regards to available and appropriate water level data from the USGS National Water Information System. Water-table elevations (for the year 2000) were derived from measurements of depth to water in wells throughout the High Plains. Wells were sampled primarily in the winter and spring to avoid effects from pumping. To produce a better water-table surface where there was believed to be connection between rivers and the aquifer in the northern and central High Plains, river stages were added to the well data. The water levels were then interpolated into a raster surface using Kriging methods. 2000 The base of aquifer data were obtained from the original mylars of 50-ft base-of-aquifer contours from a RASA (Regional Aquifer System Assessment) study of the High Plains aquifer. The contours were then made into a surface using GIS. 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, scale 1:2,500,000, 2 sheets. 2000 Aquifer-base grid was subtracted from the water-table grid. 2000 The saturated-thickness data set was clipped to the updated boundary of the High Plains aquifer. 2007 Raster data clipped to boundary of Colorado. 2008 Raster Grid Cell 1025 569 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 National Geodetic Vertical Datum of 1929 1 feet Explicit elevation coordinate included with horizontal coordinates Local surface 1 feet Attribute values ds472_sat Saturated thickness of High Plains aquifer in Colorado, 2000. Data Series 472 Value Unspecified Unspecified 0 368 U.S. Geological Survey Ask USGS -- Water Webserver Team (http://ask.usgs.gov/) mailing address

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Reston VA 20192 USA 1-888-275-8747 (1-888-ASK-USGS) http://water.usgs.gov/user_feedback_form.html 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 information product, for the most part, is in the public domain, it also contains copyrighted material as noted in the text. Permission to reproduce copyrighted items for other than personal use must be secured from the copyright owner. This database, identified as Saturated thickness of the High Plains Aquifer, Colorado, 2000, has been approved for release and publication by the Director of the USGS. Although this database has been subjected to rigorous review and is substantially complete, the USGS reserves the right to revise the data pursuant to further analysis and review. Furthermore, it is released on condition that neither the USGS nor the United States Government may be held liable for any damages resulting from its authorized or unauthorized use. Although these data have been processed successfully on a computer system at the U.S. Geological Survey, no warranty expressed or implied is made regarding the display or utility of the data on any other system, or for general or scientififc purposes, nor shall the act of distribution constitute any such warranty. The U.S. Geological Survey shall not be held liable for improper or incorrect use of the data described and/or contained herein. ESRI GRID 3.045 http://water.usgs.gov/GIS/dsdl/ds472_sat.zip unzip None 20090320 US Geological Survey Ask USGS -- Water Webserver Team mailing address

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Reston VA 20192 USA 1-888-275-8747 (1-888-ASK-USGS) http://answers.usgs.gov/cgi-bin/gsanswers?pemail=h2oteam&subject=GIS+Dataset+ds472_sat FGDC Content Standards for Digital Geospatial Metadata FGDC-STD-001-1998