Gardner, P.M. Masbruch, M.D. Plume, R.W. Buto, S.G. 2011 vector digital data Reston, VA U.S. Geological Survey http://water.usgs.gov/lookup/getspatial?sim2011_3193_potentiometric Gardner, P.M. Masbruch, M.D. Plume, R.W. Buto, S.G. 2011 document United States Geological Survey Scientific Investigations Map SIM 2011-3193 Reston, VA U.S. Geological Survey http://pubs.usgs.gov/sim/3193/ Water-level measurements from 190 wells were used to develop a potentiometric-surface map of the east-central portion of the regional Great Basin carbonate and alluvial aquifer system in and around Snake Valley, eastern Nevada and western Utah. The map area covers approximately 9,000 square miles in Juab, Millard, and Beaver Counties, Utah, and White Pine and Lincoln Counties, Nevada. Recent (2007-2010) drilling by the Utah Geological Survey and U.S. Geological Survey has provided new data for areas where water-level measurements were previously unavailable. New water-level data were used to refine mapping of the pathways of intrabasin and interbasin groundwater flow. At 20 of these locations, nested observation wells provide vertical hydraulic gradient data and information related to the degree of connection between basin-fill aquifers and consolidated-rock aquifers. Multiple-year water-level hydrographs are also presented for 32 wells to illustrate the aquifer system’s response to interannual climate variations and well withdrawals. This data set was created as part of a U.S. Geological Survey study. The intended uses of this data set include, but are not limited to, natural resource modeling, mapping, and visualization applications. 20100107 20101118 ground condition Complete None planned -114.575367 -112.853972 39.908673 38.345712 ISO 19115 Topic Category geoscientificInformation elevation inlandWaters None Groundwater Potentiometric surface Water-level altitude None Juab County Millard County Beaver County White Pine County Lincoln County Utah Nevada Great Basin None Acknowledgment of the U.S. Geological Survey would be appreciated in products derived from these data. Although this Federal Geographic Data Committee (FGDC) compliant metadata file is intended to document the data set in nonproprietary form, 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 only. U.S. Geological Survey Utah Water Science Center Center Director mailing and physical address

2329 Orton Circle

Salt Lake City UT 84119 USA (801) 908-5000 (801) 908-5001 http://water.usgs.gov/GIS/browse/sim2011_3193_potentiometric_browse.png Illlustration of data set png Technical review of this database was done by David Smith of the U.S. Geological Survey and Richard Emmerson of the Utah Geological Survey Microsoft Windows Vista Version 6.1 (Build 7600) ; ESRI ArcCatalog 9.3.1.4000 All attempts were made to verify 100 percent of the digital attribute data is complete and consistent. Verification was done by interactive on-screen review. Frequency tests were performed on all feature class attributes to check that no features were unlabeled, misspelled, or inconsistent. The logical consistency topologically is clean. Chain-node topology is present. Using ArcGIS tools and routines all lines were checked for node errors, overshoots, undershoots, dangles, intersections, and duplicate features. Complete for portions of the Great Basin carbonate and alluvial aquifer system in Juab, Millard, and Beaver Counties, Utah and White Pine and Lincoln Counties, Nevada National map accuracy standards (NMAS) established for the United States in 1947 (U.S. Geological Survey, 1988) state that no more than 10 percent of features shall be more than 1/50th of an inch from their intended location on maps of scale smaller than 1:20,000. National standards for spatial data accuracy (NSSDA) published by the Federal Geographic Data Committee (FGDC) in 1998 relate the NMAS to the digital geospatial data standard by multiplying the NMAS accuracy by a factor of 1.1406 (Federal Geographic Data Committee, 1998) resulting in expected error in the geospatial data at standard mapping scales as follows: 1: 24,000-scale map - 14 meters 1: 62,500-scale map - 36 meters 1: 100,000-scale map - 58 meters 1: 250,000-scale map - 145 meters 1: 500,000-scale map - 290 meters 1:1,000,000-scale map - 579 meters All attempts were made to verify 100 percent of the digital spatial data with supporting source datasets. Two visual checks were done to verify that the digital data was a fair representation of hydrologic conditions in the study area. References Cited: U.S. Geological Survey, 1988, National mapping program technical instructions --- Part 2: Specifications, Standards for Digital Line Graphs: U.S. Geological Survey, 56 p. Federal Geographic Data Committee, Subcommittee for Base Cartographic data, 1998, Geospatial Positioning Accuracy Standards, Part 3: National Standard for Spatial Data Accuracy, FGDC-STD-007.3-1998, last accessed 03/29/2007 at URL http://www.fgdc.gov/standards/projects/FGDC-standards-projects/accuracy/part3/chapter3 145 meters Errors resulting from source map quality, automation processes, and scale resolution can impact the accuracy of data. Errors resulting from the quality of the source map and automation processes are unknown. Taking all known and unknown sources of error into account the horizontal positional accuracy is deductively estimated at 145 meters. Water level altitude values used to control the creation of the potentiometric contours are from sources of widely varying vertical accuracy. 50 feet Errors resulting from source map quality, automation processes, and scale resolution can impact the accuracy of data. Taking all known and unknown sources of error into account the vertical accuracy is deductively estimated at 50 feet. U.S. Geological Survey Unknown database http://waterdata.usgs.gov/nwis online 20100107 20101118 ground condition NWIS Spatial and attribute information Brooks, L.E. Masbruch, M.D. Buto, S.G. 2011 vector digital data Reston, VA U.S. Geological Survey http://water.usgs.gov/GIS/metadata/usgswrd/XML/sir2010_5193_GWdisch1000.xml Heilweil, V.M., editor Brooks, L.E., editor 2011 document U.S. Geological Survey Scientific Investigations Report SIR2010-5193 Reston, VA U.S. Geological Survey http://pubs.usgs.gov/sir/2010/5193 1000000 vector digital data 1964 2006 ground condition GW Discharge Spatial information Sweetkind, D.S. Cederberg, J.R. Buto, S. G. Masbruch, M.D. 2011 raster digital data Reston, VA U.S. Geological Survey http://water.usgs.gov/lookup/getspatial?sir2010_5193_3D_HGF Heilweil, V.M., editor Brooks, L.E., editor 2011 document U.S. Geological Survey Scientific Investigations Report SIR2010-5193 Reston, VA U.S. Geological Survey http://pubs.usgs.gov/sir/2010/5193 500000 raster digital data 2011 publication date HGU Spatial information Well locations and water-level altitude measurements were extracted from the USGS NWIS database. Where necessary, land-surface and water-level altitudes were converted from National Geodetic Vertical Datum of 1929 (NGVD 29) to North American Vertical Datum of 1988 (NAVD 88) using the National Geodetic Survey (NGS) Vertcon tool (http://www.ngs.noaa.gov/TOOLS/program_descriptions.html#VERTCON). The data were converted from tabular format to a point feature class using ArcGIS tools. NWIS 2010 sim2011_3193_wells_x Well locations, water-level altitudes, areas of groundwater discharge, and hydrogeologic unit information were used as a guide to manually digitize potentiometric contours. sim2011_3193_wells_x HGU GW Discharge 2010 sim2011_3193_potentiometric_l Metadata structured and validated using the U.S. Geological Survey Geospatial Metadata Validation Service, accessed November 29, 2011 at URL http://geo-nsdi.er.usgs.gov/validation/. 20111102 Vector String 113 Entity point 190 Albers Conical Equal Area 29.500000 45.500000 -114.000000 23.000000 0.000000 0.000000 coordinate pair 0.000100 0.000100 meters North American Datum of 1983 Geodetic Reference System 80 6378137.000000 298.257222 North American Vertical Datum of 1988 0.000100 feet Explicit elevation coordinate included with horizontal coordinates sim2011_3193_potentiometric_l Line feature class ESRI OBJECTID Internal feature number. ESRI Sequential unique whole numbers that are automatically generated. SHAPE Feature geometry. ESRI Coordinates defining the features. altitude_ft Altitude of the water level (potentiometric contour) in feet above NAVD 1988 user defined 4350 5900 feet contour_interval_ft Contour interval user defined 10 50 feet line_type Line type user defined solid Solid/heavy line used for 50-foot contour intervals user defined thin Thin line used for 10-foot contour intervals user defined dashed Dashed lines used to show water-level (potentiometric) contours where less certain user defined SHAPE_Length Length of feature in internal units. ESRI Positive real numbers that are automatically generated. sim2011_3193_wells_x point feature class ESRI OBJECTID Internal feature number. ESRI Sequential unique whole numbers that are automatically generated. SHAPE Feature geometry. ESRI Coordinates defining the features. USGS_Site_ID Unique site identifier U.S. Geological Survey National Water Information System Site identifier from U.S. Geological Survey National Water Information System USGS_Station_Name Site name U.S. Geological Survey National Water Information System Site name from U.S. Geological Survey National Water Information System Latitude_NAD83 Latitude of the well, North American Datum of 1983 U.S. Geological Survey National Water Information System 38.353571 39.895218 Decimal degrees, North American Datum of 1983 Longitude_NAD83 Longitude of the well, North American Datum of 1983 U.S. Geological Survey National Water Information System -114.568889 -112.849681 Decimal degrees, North American Datum of 1983 Alt_lsd_OriginalDatum Altitude of the land surface at the well or spring site as stored in source database U.S. Geological Survey National Water Information System 4310 6396 feet above or below the specified datum Alt_lsd_NAVD88 Altitude of the land surface at the well or spring site converted to NAVD 88 National Geodetic Survey VERTCON 4310 6400 feet above or below the specified datum WL_Date Date the water level was measured U.S. Geological Survey National Water Information System 20100107 20101118 Date in yyyymmdd (-9999 = no data) WL_Time The time the water level was measured U.S. Geological Survey National Water Information System Time (-9999 = no data) WL_BLSD Water level below land surface U.S. Geological Survey National Water Information System -3.1 1426.59 feet (-9999 = no data) WL_alt_OriginalDatum Water level altitude at the well or spring site as stored in source database U.S. Geological Survey National Water Information System 4304 5901 feet (-9999 = no data) WL_alt_NAVD88 Water-level altitude referenced to North American Vertical Datum of 1988 user defined 4304 5905 feet (-9999 = no data) Hole_depth Depth of hole U.S. Geological Survey National Water Information System 12 2006 feet (-9999 = no data) Well_depth Depth of well U.S. Geological Survey National Water Information System 12 2006 feet (-9999 = no data) TopOpen_First Top of shallowest open interval U.S. Geological Survey National Water Information System 0 1597 feet (-9999 = no data) BottomOpen_Last Bottom of deepest open interval U.S. Geological Survey National Water Information System 12 2006 feet (-9999 = no data) HGU Indicates the hydrogeologic unit the well is completed in user defined BF Basin-fill aquifer unit user defined, see larger work citation for details BF-U Basin-fill aquifer unit, uncertain user defined, see larger work citation for details LCAU Lower carbonate aquifer unit user defined, see larger work citation for details LCAU-U Lower carbonate aquifer unit, uncertain user defined, see larger work citation for details NCCU Non-carbonate confining unit user defined, see larger work citation for details UCAU Upper carbonate aquifer unit user defined, see larger work citation for details UCAU-U Upper carbonate aquifer unit, uncertain user defined, see larger work citation for details VU Volcanic unit user defined, see larger work citation for details Hydrograph Hydrograph for this well is shown on figure 2 of the larger work citation user defined No Hydrograph is not displayed on figure 2 of the larger work citation user defined Yes Hydrograph is displayed on figure 2 of the larger work citation user defined Map_ID Map identifier used to cross reference water level locations shown on the larger work citation with site information in this dataset user defined 1 190 none 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://water.usgs.gov/user_feedback_form.html Downloadable Data Although these data have 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. File Geodatabase 9.3 Spatial and attribute information WinZip 1.66 MB http://water.usgs.gov/GIS/dsdl/sim2011_3193_potentiometric.gdb.zip Shapefile NA Spatial and attribute information WinZip 1.66 MB http://water.usgs.gov/GIS/dsdl/sim2011_3193_potentiometric.shape.zip None. This dataset is provided by USGS as a public service. 20110307 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+sim2011_3193_potentiometric FGDC Content Standards for Digital Geospatial Metadata FGDC-STD-001-1998