Douglas K. Maurer Susan G. Buto 2006 vector digital data http://water.usgs.gov/lookup/getspatial?sir2006-5100_dtwha153_l Thomas J. Lopes Susan G. Buto J. LaRue Smith Toby L. Welborn 2006 U.S. Geological Survey Scientific Investigations Report 2006-5100 http://pubs.water.usgs.gov/sir2006-5100 This data set consists of depth to ground water contours for hydrographic-area (HA) 153, Diamond Valley, Nevada. These data represent static ground-water levels measured in the HA during March and April of 2001. These data were created as part of an effort to provide statewide information on water table and depth to ground water for Nevada. Digital water-table contours from 38 published reports representing data from 1947 to 2004 were combined to create a single statewide data set. Water-table contours for Diamond Valley were published in 1968 (Harrill, 1968), the depth to water has increased by tens of feet in this basin, however, so more recent data were needed to estimate current contours. This data set and the associated water-table data were used to develop raster based models of water table and depth to ground water. Reference Cited Harrill, J.R., 1968, Hydrologic response to irrigation pumping in Diamond Valley, Eureka and Elko Counties, Nevada, 1950-65, with a section on surface water by R.D. Lamke: Nevada Department of Conservation and Natural Resources, Water Resources Bulletin 35, 85 p. 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. 200103 200104 ground condition Complete None planned -116.072490 -115.872667 39.934257 39.545797 none depth to water contour ground water inlandWaters none Nevada Great Basin Diamond Valley HA 153 Eureka County Elko County 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 Natalie Houston and Douglas O. Shipley of the U.S. Geological Survey. Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 1; ESRI ArcCatalog 9.0.0.580 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 Susan G. Buto Sienna Smith-Sager 2006 vector digital data http://water.usgs.gov/lookup/getspatial?nv_dtw750nv_l All attempts were made to compare 100 percent of the digital attribute 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. Frequency tests were run on the arc attributes to check for unlabeled, misspelled, or inconsistent feature labels. Corrections were made until two visual and manual comparisons, combined with on-screen review, determined 100 percent of the digital attribute 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 1:100,000-scale for Diamond Valley, Nevada Verification plots were generated at 1:100,000-scale and overlain on the original map. Corrections were made until no light was visible between the original line and the digitized line. Two visual and manual checks were done to verify that the digital data were a fair representation of the original source map. 55 meters Errors resulting from the quality of the source map, the automation process, and the scale resolution can impact the accuracy of the data. The depth-to-water contours were created from 1:100,000-scale maps. The inherent horizontal error of a 1:100,000-scale map is approximately 50 meters according to the National Map Accuracy Standards of 1947. The automation process resulted in an root mean square (RMS) error less than 0.001. Subsequent edits were done under an RMS error of 0.003. The errors resulting from the quality of the source map are unknown. The horizontal positional accuracy was verified by visual and manual comparison as described in the Accuracy Report and the Process Steps and matches the positional accuracy of the original source map. The horizontal positional error is deductively estimated at approximately 55 meters. Douglas K. Maurer Unpublished Material map 100,000 mylar separate 2001 ground condition for March and April 2001 contour map The depth to water contours were digitized from this mylar base map. Static well measurements from March and April of 2001 were used to hand draw contours on a mylar base map using 1:100,000-scale U.S. Geological Survey Digital Raster Graphics (DRGs) for reference. contour map 2002 1. The depth to ground-water contours were digitized directly into UTM Zone 11, North American Datum of 1927 (NAD 1927) from the mylar base map with an RMS error < 0.001. 2. Items were added to the arc attribute table using the ArcGIS Workstation ADDITEM command. The attribute values were populated during digitizing. 3. Line topology was built using the BUILD command. 4. Positional and attribute accuracy was verified and corrections were made until two visual and manual comparisons verified that the digital data were a fair representation of the original source map as described in the horizontal accuracy report. 5. Line topology was rebuilt using the CLEAN command with the fuzzy tolerance = 0.001 meters and dangle length = 0.01 meters. contour map 200302 The data set was reviewed by the U.S. Geological Survey Ground-water Specialist in the Carson City Water Science Center. After review, arcs were altered where the specialist indicated. The mylar map of the hand-drawn contours was marked where the arcs were to be altered. The plot was placed on the digitizing table and registered with an RMS error = 0.003. Alterations were made until two visual and on-screen comparisons verified that the digital data were a fair representation of the altered source. contour map 200311 1. Using various ArcGIS Workstation commands and the ArcEdit module, arcs were checked for node errors and attribute accuracy. 2. The attribute dtwha153_l-ID was calculated to be a unique sequential integer based on dtwha153_l#. 200402 Metadata were structured and validated using metadata tools, MP and CNS, developed by Peter Schweitzer, U.S. Geological Survey. 200407 Vector Complete chain 76 Point 9 Universal Transverse Mercator 11 0.999600 -117.000000 0.000000 500000.000000 0.000000 coordinate pair 0.000312 0.000312 meters North American Datum of 1927 Clarke 1866 6378206.400000 294.978698 dtwha153_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 (meters). ESRI Positive real numbers that are automatically generated. DTWHA153_L# Internal feature number. ESRI Sequential unique whole numbers that are automatically generated. DTWHA153_L-ID Whole numbers that are automatically generated. ESRI User defined whole number RMS-I The root mean square (RMS) error computed during registration of the map to the digitizer, in digitizer units (inches) ESRI Decimal number computed during the automation process RMS-O The root mean square (RMS) error calculated during registration of the map to the digitizer, in map units (meters) ESRI Decimal number computed during the automation process DATE-DIG The calendar date the contours were digitized user-defined Calendar date in the form yyyymm REPORT Code representing the report number where the contours were originally published user-defined sir20065100 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. user-defined REPORT-YR The year the report was published user-defined Calendar date in the form yyyy COMMENTS Used to document comments about the digital data or the original report user-defined Text DEPTH-FT Depth-to-ground-water, in feet user-defined 10 220 feet DEPTH-M Depth-to-ground-water, in meters computed from depth-ft (depth-ft * 0.3048) 3.048 67.056 meters CONFIDENCE The confidence level associated with the contour user-defined approximate contour location is approximate user-defined > ha153dtwnv_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 DTWHA153_L# 4 5 B - - > 29 DTWHA153_L-ID 4 5 B - - > 33 RMS-I 4 8 F 3 - > 37 RMS-O 4 8 F 3 - > 41 DATE-DIG 8 8 I - - > 49 REPORT 20 20 C - - > 69 REPORT-YR 5 5 I - - > 74 COMMENTS 60 60 C - - > 134 DEPTH-FT 5 5 I - - > 139 DEPTH-M 4 8 F 3 - > 143 CONFIDENCE 30 30 C - - RMS-I is the root mean square error of registration to the digitizer in input units (inches) RMS-O is the root mean square error of registration to the digitizer in output units (meters) DATE-DIG is the calendar date the contours were digitized REPORT is a code representing the report where the contours are published REPORT-YR is the year the report was published COMMENTS documents comments about the digital data or original report DEPTH-FT is the depth to ground water, in feet DEPTH-M is the depth to ground water, in meters, calculated by multiplying the field DEPTH-FT by the value 0.3048 CONFIDENCE is the confidence level associated with the contour provided above U.S. Geological Survey Ask USGS - Water Webserver Team mailing address

445 National Center

Reston VA 20192 http://answers.usgs.gov/cgi-bin/gsanswers?pemail=h2oteam&subject=GIS+Dataset+sir2006-5100_dtwha153_l 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 0.035 http://water.usgs.gov/GIS/dsdl/sir2006-5100_dtwha153_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+sir2006-5100_dtwha153_l FGDC Content Standards for Digital Geospatial Metadata FGDC-STD-001-1998