Susan G. Buto Sienna Smith-Sager 2006 vector digital data Reston, VA U.S. Geological Survey http://water.usgs.gov/lookup/getspatial?nv_dtw750nv_l Rush, F.E 1974 map Nevada Department of Conservation and Natural Resources, Division of Water Resources Map not applicable This data set consists of static ground-water levels for the State of Nevada based on a 1974 ground-water map (Rush, 1974) published by the Nevada Department of Conservation and Natural Resources, Division of Water Resources, State Engineers Office. These data were digitized from the source as part of an effort to provide statewide information on water table and depth to ground water for Nevada. Reference Cited Rush, F.E., 1974, Static ground water levels of Nevada: Nevada Department of Conservation and Natural Resources, Division of Water Resources map, 1 sheet, scale 1:750,000. This data set was created as part of a U.S. Geological Survey study, done in cooperation with the Nevada Division of Environmental Protection, to evaluate the susceptibility and vulnerability of ground water to anthropogenic contamination. The data set was created as part of an effort to provide statewide information on depth to ground water and water-table levels in Nevada. One variable that may control the susceptibility of ground water to contamination and determines contamination transport is depth to water (Lopes and others, 2006). This data set was used to develop raster surfaces of water-table altitude and depth to ground water for Nevada. The intended uses of this data set include, but are not limited to, natural resource modeling, mapping, and visualization applications. Reference Cited Lopes, T.J., Buto, S.G., Smith, J.L., and Welborn, T.L., 2006, Water-table levels and gradients, Nevada, 1947-2004: U.S. Geological Survey Scientific Investigations Report 2006-5100, 27 p. 1974 publication date Complete None planned -120.111616 -113.822423 42.004682 35.019184 none Static ground-water levels Depth to ground water inlandWaters none Nevada Great Basin None. Although this Federal Geographic Data Committee (FGDC) compliant metadata file is intended to document the data set in nonproprietary form, as well as ArcGIS format, this metadata file may include some ArcGIS-specific terminology. These data are not intended to be used as a survey product and are for reference purposes only. Acknowledgment of the U.S. Geological Survey and the Nevada Division of Environmental Protection would be appreciated in products derived from these data. U.S. Geological Survey Public Information Assistant mailing and physical address

333 W. Nye Lane

Carson City NV 89706 USA (775) 887-7600 (775) 887-7629 GS-W-NVpublic-info@usgs.gov Compilation of this data set and the associated metadata was done in cooperation with the Nevada Division of Environmental Protection. Technical review of this data set and metadata was provided by Douglas O. Shipley and Toby L. Welborn of the U.S. Geological Survey. Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 1; ESRI ArcCatalog 9.0.0.580 Douglas K. Maurer Susan G. Buto 2006 vector digital data http://water.usgs.gov/lookup/getspatial?sir2006-5100_dtwha153_l Susan G. Buto David M. Evetts Sienna Smith-Sager 2006 vector digital data http://water.usgs.gov/lookup/getspatial?sir2006-5100_wanv_l J. LaRue Smith Toby L. Welborn 2006 raster digital data http://water.usgs.gov/lookup/getspatial?sir2006-5100_wanv_g J. LaRue Smith Toby L. Welborn 2006 raster digital data http://water.usgs.gov/lookup/getspatial?sir2006-5100_dtwnv_g All attempts were made to compare 100 percent of the digital spatial data to the original source map. Verification was done by visual and manual comparison, combined with on-screen review, of the source with hard copy plots. Corrections were made until two comparisons determined 100 percent of the digital spatial data matched the original source map. The logical consistency topologically is clean. Chain-node topology is present. Using ArcGIS Workstation commands and routines all arcs were checked for node errors, overshoots, undershoots, dangles, intersections, and duplicate features. Complete at 1:750,000-scale for Nevada. Errors resulting from the quality of the source map, the automation process, and the scale resolution can impact the accuracy of the data. The errors resulting from the quality of the source map and the automation process are unknown. The inherent error of a 1:750,000-scale map is approximately 320 meters according to the National Map Accuracy Standards of 1947. 350 meters The horizontal positional accuracy was verified by visual and manual comparison as described in the Horizontal_Positional_Accuracy_Report and the Process_Steps and matches the positional accuracy of the original source map. The horizontal positional error is deductively estimated at 350 meters. F.E. Rush 1974 map Nevada Department of Conservation and Natural Resources, Division of Water Resources map Not applicable Carson City, NV Nevada Department of Conservation and Natural Resources, Division of Water Resources 750,000 paper 1974 publication date water-level map spatial and attribute information The water-level map was securely taped to a digitizing table and registered to the Lambert conformal conic projection with the parameters set for the Nevada State base map (central meridian = -117°, first standard parallel = 33°00'00", second standard parallel = 45°00'00") , North American Datum 1927 (NAD 27). The contours were digitized directly into the coordinate system using the ArcGIS ArcEdit module and commands. The maximum root mean square error during digitizing was 0.002. water-level map 200304 - 200306 1. 1:750,000-scale hard copy plots of the digitized water-level map were generated. Using a light table, these plots were visually and manually compared with the water-level map. 2. Corrections were made to the spatial data until two visual and manual comparisons, combined with on-screen review, determined there was no light between the original and digital lines and the attribute data matched the source map. 3. Polygon and line topology were built using the ArcGIS Workstation command CLEAN with the fuzzy tolerance = 0.001 and dangle length = 0.01. 4. The data set was projected from Lambert, NAD 27 to UTM, Zone 11, NAD 27 using the ArcGIS Workstation command PROJECT. water-level map 200308 1. The attribute DTW750NV_L-ID was calculated to be a unique sequential integer equal to DTW750NV_L#. 2. Line topology was built using the ArcGIS Workstation command Build. 3. Metadata were structured and validated using metadata tools, MP and CNS, developed by Peter Schweitzer, U.S. Geological Survey. 200411 Vector Complete chain 566 Point 134 Point 134 Universal Transverse Mercator 11 0.999600 -117.000000 0.000000 500000.000000 0.000000 coordinate pair 0.005612 0.005612 meters North American Datum of 1927 Clarke 1866 6378206.400000 294.978698 dtw750nv_l.aat arc attribute table ESRI FID Internal feature number. ESRI Sequential unique whole numbers that are automatically generated. Shape Feature geometry. ESRI Coordinates defining the features. FNODE# Internal node number for the beginning of an arc (from-node). ESRI Whole numbers that are automatically generated. TNODE# Internal node number for the end of an arc (to-node). ESRI Whole numbers that are automatically generated. LPOLY# Internal node number for the left polygon. ESRI Whole numbers that are automatically generated. RPOLY# Internal node number for the right polygon. ESRI Whole numbers that are automatically generated. LENGTH Length of feature in internal units. ESRI Positive real numbers that are automatically generated. DTW750NV_L# Internal feature number. ESRI Sequential unique whole numbers that are automatically generated. DTW750NV_L-ID User-defined feature number. ESRI Sequential unique whole numbers equal to the value of DTW750NV_L#. DEPTH-FT The depth to ground water, in feet. water-level map 10 700 Feet DEPTH-M The depth to ground water in meters. Calculated by multiplying DEPTH-FT by 0.3048. user-defined 3.048 213.36 Meters CONFIDENCE The confidence level associated with the contour. water-level map little supporting data The contour location was estimated based on a small amount of data. water-level map inferred, very little data The contour location is inferred and based on very little supporting data. water-level map >dtw750nv_l.aat > >COLUMN ITEM NAME WIDTH OUTPUT TYPE N.DEC ALTERNATE NAME INDEXED? > 1 FNODE# 4 5 B - - > 5 TNODE# 4 5 B - - > 9 LPOLY# 4 5 B - - > 13 RPOLY# 4 5 B - - > 17 LENGTH 8 18 F 5 - > 25 DTW750NV_L# 4 5 B - - > 29 DTW750NV_L-ID 4 5 B - - > 33 DEPTH-FT 5 5 I - - > 38 DEPTH-M 4 8 F 3 - > 42 CONFIDENCE 30 30 C - - DEPTH-FT is the depth to ground water, in feet, as reported by Rush, 1974. DEPTH-M is the depth to ground water, in meters, calculated by multiplying DEPTH-FT by 0.3048. CONFIDENCE is the confidence level on the contour as reported by Rush, 1974. provided above U.S. Geological Survey Ask USGS -- Water Webserver Team mailing address

445 National Center

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 these data, software, or related materials. The use of firm, trade, or brand names in this report is for identification purposes only and does not constitute endorsement by the U.S. Geological Survey. The names mentioned in this document may be trademarks or registered trademarks of their respective trademark owners. WinZipped ARCE spatial and attribute information WinZip 0.320 http://water.usgs.gov/GIS/dsdl/nv_dtw750nv_l.e00.zip None. This data set is provided by USGS as a public service. 20060508 U.S. Geological Survey Ask USGS -- Water Webserver Team mailing address

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+nv_dtw750nv_l FGDC Content Standards for Digital Geospatial Metadata FGDC-STD-001-1998