Susan G. Buto Donald S. Sweetkind 2011 vector digital data Reston, VA U.S. Geological Survey http://water.usgs.gov/lookup/getspatial?sir2010_5193_ha1000 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/ This dataset was created in support of a U.S. Geological Survey (USGS) study focusing on groundwater resources in the Great Basin carbonate and alluvial aquifer system (GBCAAS). The GBCAAS is a complex aquifer system comprised of both unconsolidated and bedrock formations covering an area of approximately 110,000 square miles. The aquifer system is situated in the eastern portion of the Great Basin Province of the western United States. The eastern Great Basin is experiencing rapid population growth and has some of the highest per capita water use in the Nation. These factors, combined with its arid setting, have levied intensive demand upon current groundwater resources and, thus, predictions of future shortages. Because of the large regional extent of the aquifer system, rapid growth in the region, and the reliance upon groundwater for urban populations, agriculture, and native habitats, the GBCAAS was selected by the USGS Water Resources program as part of the National Water Census Initiative to evaluate the nation's groundwater availability. This dataset contains hydrographic area (HA) boundaries and polygons for the GBCAAS study area. The study area consists of 165 HAs based on Great Basin HAs defined by the USGS in 1988 (Harrill and others, 1988; Buto, 2009). The study area is characterized by north-south trending alluvial basins separated by intervening mountain ranges. HA boundaries generally coincide with the topographic highs separating these basins but may also contain arbitrary divisions that have no topographic control. HAs generally consist of thick layers of unconsolidated geologic deposits in the basins and consolidated bedrock in the mountain ranges. The basins are underlain by bedrock at varying depths. Much of the bedrock in the study area consists of permeable carbonate and volcanic rock strata, both of which allow some degree of hydraulic connection between hydrographic areas. The hydrographic area boundaries in this dataset have been assigned a code identifying each boundary as a potential barrier, conduit, or neutral zone to groundwater flow between basins. References cited: Buto, S.G., 2009, Digital representation of 1:1,000,000-scale Hydrographic Areas of the Great Basin: U.S. Geological Survey Digital Data Report 457, 5 p., <http://pubs.usgs.gov/ds/457/> Harrill, J.R., Gates, J.S., and Thomas, J.M., 1988, Major ground-water flow systems in the Great Basin region of Nevada, Utah, and adjacent states: U.S. Geological Survey Hydrologic Investigations Atlas HA-694-C, 2 sheets, scale 1:1,000,000. <http://pubs.er.usgs.gov/usgspubs/ha/ha694C> This dataset was created to support hydrologic investigations in the Great Basin. The intended uses of this dataset include, but are not limited to, natural resource modeling, mapping, and visualization applications. This dataset was modified from digital data based on USGS Hydrologic Atlas HA694-C (Harrill and others, 1988; Buto, 2009). The source dataset consists of HAs and flow system boundaries for the Great Basin region in Nevada, Utah and parts of adjacent states. Hydrographic areas in Nevada were delineated by the USGS and Nevada Division of Water Resources in the late 1960s (Cardinalli and others, 1968; Rush, 1968) for scientific and administrative purposes. The official hydrographic area names, numbers, and geographic boundaries continue to be used in USGS scientific reports and Nevada Division of Water Resources administrative activities. The Nevada HAs differ slightly from the Great Basin HAs created for HA694-C. The Nevada HAs were published in digital format at 1:750,000-scale by the USGS in 2005 (HA750, Peltz and others, 2005). Attributes from HA750 have been added to this dataset to facilitate cross referencing the two systems. Notable differences between the data sets are as follows: GBCAAS HA 254 - Snake Valley is composed of three valleys in HA750: HA 196 - Hamlin Valley, HA 194 - Pleasant Valley, and HA 195 - Snake Valley. GBCAAS HA 243 - Death Valley is composed of two valleys in HA750: HA 231 - Grapevine Canyon and HA 232 - Oriental Wash. The remainder of GBCAAS HA 243 is outside the state boundary and therefore not present in HA750. GBCAAS HA 280 - Beryl-Enterprise Area is HA 197 - Escalante Desert in HA750 GBCAAS HA 48 - Tenmile Creek Area is named "Dixie Creek-Tenmile Creek area" in HA750. The hydrographic area number is the same. GBCAAS HA 252 - Pilot Valley does not exist in HA750. The area is part of HA 192 - Great Salt Lake Desert in HA750. GBCAAS HA 261A - Great Salt Lake Desert (West Part) is HA 192 - Great Salt Lake Desert in HA750. GBCAAS HA 251 - Grouse Creek Valley is HA 190 - Grouse Creek Valley in HA750. The Southwestern boundary of this area is significantly different in HA750. GBCAAS HA 253 - Deep Creek Valley is HA193 - Deep Creek Valley in HA750 References cited: Buto, S.G., 2009, Digital representation of 1:1,000,000-scale Hydrographic Areas of the Great Basin: U.S. Geological Survey Digital Data Report 457, 5 p., http://pubs.usgs.gov/ds/457/ Cardinalli, J.L., Roach, L.M., Rush, F.E., and Vasey, B.J., 1968, State of Nevada hydrographic areas, scale 1:500,000, in Rush, F.E., ed., Index of hydrographic areas: Nevada Division of Water Resources Information Report 6, 38 p. Harrill, J.R., Gates, J.S., and Thomas, J.M., 1988, Major ground-water flow systems in the Great Basin region of Nevada, Utah, and adjacent states: U.S. Geological Survey Hydrologic Investigations Atlas HA-694-C, 2 sheets, scale 1:1,000,000. http://pubs.er.usgs.gov/usgspubs/ha/ha694C Peltz, L.A., Medina, R.L., and Buto, S.G., 2005, 1:750,000-scale hydrographic areas and basin-wide pumpage, recharge and interbasin flow estimates of Nevada: U.S. Geological Survey vector digital data, http://water.usgs.gov/lookup/getspatial?nv_ha750nv Rush, F.E., 1968, Index of hydrographic areas in Nevada: Nevada Division of Water Resources Information Report 6, 38 p. 2011 publication date Complete None planned -120.329726 -110.845124 42.643413 35.116974 ISO 19115 topic category inlandWaters none Hydrographic Area Flow System none Great Basin Utah Nevada Idaho California None. This data set is provided by USGS as a public service. Although this Federal Geographic Data Committee (FGDC) compliant metadata file is intended to document the dataset 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 sbuto@usgs.gov http://water.usgs.gov/GIS/browse/sir2010_5193_ha1000.jpg Illlustration of data set jpg Acknowledgement of the U.S. Geological Survey would be appreciated in products derived from these data. Technical review of this database was done by Shana L. Mashburn, USGS Oklahoma Water Science Center and Toby L. Welborn, USGS Nevada Water Science Center. Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 3; ESRI ArcCatalog 9.2.4.1420 Brooks, L.E. Masbruch, M.M. Buto, S.G. 2011 vector digital data Reston, VA U.S. Geological Survey http://water.usgs.gov/lookup/getspatial?sir2010_5193_GWdisch1000 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/ Masbruch, M.M. Buto, S.G. 2011 vector digital data Reston, VA U.S. Geological Survey http://water.usgs.gov/lookup/getspatial?sir2010_5193_potentiometric1000 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/ Sweetkind, D.S. Cederberg, J.R. Buto, S.G. Masbruch, M.M. 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/ Alan L. Flint Lorraine E. Flint 2011 raster digital data Reston, VA U.S. Geological Survey http://water.usgs.gov/lookup/getspatial?sir2010_5193_BCM 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 All attempts were made to verify 100 percent of the digital attribute data with the source. 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. Corrections were made until two visual and manual comparisons, combined with on-screen review, determined 100 percent of the digital attribute data matched the source maps The logical consistency topologically is clean. Polygon and Chain-node topology is present. Using ArcGIS tools and routines, all polygons were checked for closure, sliver polygons, and duplicate features; all lines were checked for node errors, overshoots, undershoots, dangles, intersections, and duplicate features. Complete for the eastern Great Basin. 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 This dataset is derived from 1:1,000,000-scale digital data. 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 600 meters Errors resulting from source map quality, automation processes, and scale resolution can impact the accuracy of data. The accuracy of the source map is estimated at 580 meters. Errors resulting from the quality of the source map and automation processes are unknown. Taking all assumed and unknown sources of error into account, the error of the digital data is deductively estimated at 600 meters. Buto, S.G. 2009 vector digital data U.S. Geological Survey Data Series Report 457 Reston, VA U.S. Geological Survey http://pubs.usgs.gov/ds/457/ Harrill, J.R. Gates, J.S. Thomas, J.M. 1988 map U.S. Geological Survey Hydrologic Investigations Atlas HA694-C Reston, VA U.S. Geological Survey http://pubs.er.usgs.gov/usgspubs/ha/ha694C 1000000 vector digital data 1988 publication date GBHA spatial and attribute information Lorri A. Peltz Rose L. Medina Susan G. Buto 2005 vector digital data Reston, VA U.S. Geological Survey http://water.usgs.gov/lookup/getspatial?nv_ha750nv 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 750000 digital vector data 2005 publication date HA750 spatial data Hydrographic areas (HA) covering the GBCAAS study area were selected from the larger Great Basin HA dataset and exported to a new dataset. Attributes specific to the GBCAAS study were added to the line and polygon feature classes and populated. These attributes reflect modifications to the data within the GBCAAS study area including modifications to hydrographic area boundaries and flow system groupings. A system for cross referencing HA names and numbers from HA750 to the Great Basin HAs was added to the dataset. The system is intended to clarify differences between the Nevada and larger Great Basin HA naming and numbering systems. See the supplemental information of this document for a detailed listing of the differences between the datasets. GBHA HA750 2007-2008 sir20105193_ha1000_l sir20105193_ha1000_p Vector G-polygon 265 String 793 Albers Conical Equal Area 29.500000 45.500000 -114.000000 23.000000 0.000000 0.000000 coordinate pair 0.000167 0.000167 meters North American Datum of 1983 Geodetic Reference System 80 6378137.000000 298.257222 sir20105193_ha1000_p Polygon feature class ESRI OBJECTID Internal feature number. ESRI Sequential unique whole numbers that are automatically generated. SHAPE Feature geometry. ESRI Coordinates defining the features. GBCAAS_hyd_area Hydrographic area number used by GBCAAS study GBHA U.S. Geological Survey Hydrologic Investigations Atlas HA694-C U.S. Geological Survey GBCAAS_hyd_area_name Hydrographic area name used by GBCAAS study GBHA U.S. Geological Survey Hydrologic Investigations Atlas HA694-C U.S. Geological Survey GBCAAS_subarea_name Subarea name used by GBCAAS study GBHA U.S. Geological Survey Hydrologic Investigations Atlas HA694-C U.S. Geological Survey GBCAAS_flow_system Flow system number used by GBCAAS study Modified from GBHA U.S. Geological Survey Hydrologic Investigations Atlas HA694-C U.S. Geological Survey GBCAAS_flow_system_name Flow system name used by GBCAAS study GBHA U.S. Geological Survey Hydrologic Investigations Atlas HA694-C U.S. Geological Survey HA750_hyd_area Hydrographic area number from HA750 HA750 1:750,000-scale hydrographic areas and basin-wide pumpage, recharge, and interbasin flow estimates of Nevada U.S. Geological Survey HA750_hyd_area_name Hydrographic area name from HA750 HA750 1:750,000-scale hydrographic areas and basin-wide pumpage, recharge, and interbasin flow estimates of Nevada U.S. Geological Survey HA750_subarea_name Subarea name from HA750 HA750 1:750,000-scale hydrographic areas and basin-wide pumpage, recharge, and interbasin flow estimates of Nevada U.S. Geological Survey area_acres Calculated area in acres User defined 7817 2974546 Acres SHAPE_Length Length of feature in internal units. ESRI Positive real numbers that are automatically generated. SHAPE_Area Area of feature in internal units squared. ESRI Positive real numbers that are automatically generated. sir20105193_ha1000_l Polyline feature class ESRI OBJECTID Internal feature number. ESRI Sequential unique whole numbers that are automatically generated. SHAPE Feature geometry. ESRI Coordinates defining the features. GBCAAS_linetype GBCAAS boundary type GBCAAS study 1 GBCAAS study area boundary User defined 2 GBCAAS major flow system boundary User defined 3 GBCAAS hydrographic area boundary within major flow system User defined linesource Source for the line User defined GBHA Line was derived from the digital version of USGS Hydrologic Investigations Atlas 694-C User defined GBCAAS Line added to dataset for use by GBCAAS study User defined bdry_type Geologic boundary type User defined Barrier Interbasin flow not likely; not permitted by subsurface geology User defined Conduit Interbasin flow is likely; permitted by subsurface geology User defined Uncertain Interbasin flow is possible; boundary not well constrained User defined geo_code Code used to identify the geologic reason for boundary definition User defined 11 Noncarbonate confining unit (NCCU) near (within 100 m) or at land surface, based on 3D framework. Unit assumed to project to great depths below any outcrop exposure. Included NCCU exposures from geologic map in places where 3D framework did not exactly match geologic map. Ignored small (1 or 2 model cells) inliers of permeable units surrounded by NCCU. User defined, see larger work citation and cross references for details of hydrogeologic units and 3D framework model. Hydrogeologic units are defined in accompanying table. Geocodes are defined in accompanying table and related to sir20105193 via a relationship class. 12 Upper siliciclastic confining unit (USCU) near (within 75 m) or at land surface and unit greater than 250 m thick, based on 3D framework. Included selected USCU exposures from geologic map in places where unit thickness was less than 250 m where dip of the unit increases the cross-sectional area of the unit at the HA boundary so that it could still function as a geologic barrier. User defined, see larger work citation and cross references for details of hydrogeologic units and 3D framework model. Hydrogeologic units are defined in accompanying table. Geocodes are defined in accompanying table and related to sir20105193 via a relationship class. 13 HA boundaries that are parallel to thrust faults and thrusted NCCU (TNCCU) such that water in Paleozoic rocks would not be expected to cross the thrust fault. For the purposes of potentiometric surface interpretation, included thrust faults from the Central Nevada thrust belt and the Sevier thrust belt that were not explicitly included in the 3D framework. User defined, see larger work citation and cross references for details of hydrogeologic units and 3D framework model. Hydrogeologic units are defined in accompanying table. Geocodes are defined in accompanying table and related to sir20105193 via a relationship class. 14 Areas where local extreme extension thins or disrupts Paleozoic carbonate rocks such that a continuous carbonate aquifer is unlikely. Includes portions of the Grant Range, northern Snake Range, Egan Range, and Mormon Mountains. User defined, see larger work citation and cross references for details of hydrogeologic units and 3D framework model. Hydrogeologic units are defined in accompanying table. Geocodes are defined in accompanying table and related to sir20105193 via a relationship class. 15 Presence of "western facies" deepwater assemblages in the upper plate of the Roberts Mountain allocthon. Includes siliceous chert limestone assemblages of the Vinini and Valmy Formations in the vicinity of Elko and Battle Mountain, NV. These units are attributed as TNCCU in the 3D framework and are expected to be generally low-permeability rocks. User defined, see larger work citation and cross references for details of hydrogeologic units and 3D framework model. Hydrogeologic units are defined in accompanying table. Geocodes are defined in accompanying table and related to sir20105193 via a relationship class. 21 Upper carbonate aquifer unit (UCAU) or lower carbonate aquifer unit (LCAU) near (within 50 m) or at land surface and unit greater than 250 m thick, based on 3D framework. Included narrow alluvial-filled valleys that were flanked by carbonate-rock mountain ranges where carbonate bedrock could reasonably be inferred at depth beneath valley. User defined, see larger work citation and cross references for details of hydrogeologic units and 3D framework model. Hydrogeologic units are defined in accompanying table. Geocodes are defined in accompanying table and related to sir20105193 via a relationship class. 22 Thick (>75 m) ash-flow tuffs overlying permeable carbonate bedrock. Ash-flow tuffs expected to support well-developed fracture networks and be moderately permeable local to subregional aquifers. User defined, see larger work citation and cross references for details of hydrogeologic units and 3D framework model. Hydrogeologic units are defined in accompanying table. Geocodes are defined in accompanying table and related to sir20105193 via a relationship class. 23 Areas of Cenozoic basin fill where the lower basin fill (LBFAU) is interpreted to be either ash-flow tuff or prevolcanic sedimentary rock AND the upper basin fill (UBFAU) is interpreted to be either coarse-grained younger sediment or exposures of prevolcanic sedimentary rocks that exist in the shallow part of the basin. User defined, see larger work citation and cross references for details of hydrogeologic units and 3D framework model. Hydrogeologic units are defined in accompanying table. Geocodes are defined in accompanying table and related to sir20105193 via a relationship class. 31 Intracaldera volcanic rocks. Thick sequences of highly heterogeneous volcanic rocks (including welded and nonwelded tuff, lava flows, volcanic breccias, and nonvolcanic megabreccia deposits) that are bounded by the caldera structures. This unit overlies intrusive rocks of the NCCU inferred to be present at depth with calderas; unit has potential to be hydrothermally altered. User defined, see larger work citation and cross references for details of hydrogeologic units and 3D framework model. Hydrogeologic units are defined in accompanying table. Geocodes are defined in accompanying table and related to sir20105193 via a relationship class. 32 Volcanic rocks, mainly ash-flow tuffs, of variable thickness that overlie impermeable bedrock. Common in Esmeralda County, NV, near Lake Mead in the southern part of Clark County, NV, and in San Bernadino County, CA. User defined, see larger work citation and cross references for details of hydrogeologic units and 3D framework model. Hydrogeologic units are defined in accompanying table. Geocodes are defined in accompanying table and related to sir20105193 via a relationship class. 33 Highly variable volcanic rock overlying bedrock that has variable or uncertain permeability. Examples include local accumulations of rhyolite lava flow, such as at the southern end of Butte Valley, NV, or intervals of thin welded ash-flow tuff interbedded with nonwelded tuff. User defined, see larger work citation and cross references for details of hydrogeologic units and 3D framework model. Hydrogeologic units are defined in accompanying table. Geocodes are defined in accompanying table and related to sir20105193 via a relationship class. 34 Mineral deposits that are associated with hydrothermal alteration and mineralization at a scale large enough to potentially disrupt the regional aquifer systems. Mainly two deposit types: [1] copper porphyry systems and [2] epithermal and hot spring precious metal systems. Deemed important where mineralizing system intruded otherwise permeable carbonate rocks, such as at Bingham Canyon, UT or Battle Mountain, NV. Where the mineralizing system overprints lower permeability rocks, such as at Tintic, UT. HA boundaries were not modified from their original classification based on rock type. User defined, see larger work citation and cross references for details of hydrogeologic units and 3D framework model. Hydrogeologic units are defined in accompanying table. Geocodes are defined in accompanying table and related to sir20105193 via a relationship class. 35 Areas where either the lower basin fill (LBFAU), the upper basin fill (UBFAU) or both units were fine grained or had a large volcanic ash component. User defined, see larger work citation and cross references for details of hydrogeologic units and 3D framework model. Hydrogeologic units are defined in accompanying table. Geocodes are defined in accompanying table and related to sir20105193 via a relationship class. 36 Areas where zones of closely spaced normal faults may enhance permeability of otherwise low-permeability rocks. Examples include seismogenically active faults cutting granites of the Slate Range near Lida Valley and Clayton Valley, Esmeralda County, NV. User defined, see larger work citation and cross references for details of hydrogeologic units and 3D framework model. Hydrogeologic units are defined in accompanying table. Geocodes are defined in accompanying table and related to sir20105193 via a relationship class. SHAPE_Length Length of feature in internal units. ESRI Positive real numbers that are automatically generated. 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+SIR2010_5193_ha1000 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. 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 personal geodatabase 9.2 ESRI 9.2 personal geodatabase Spatial and attribute information http://water.usgs.gov/GIS/dsdl/SIR2010_5193_ha1000.pgdb.zip WinZipped shapefile 07252011 ESRI shapefile. Note some information such as field names and relationship classes may be altered or removed from the source data during conversion to ESRI shapefile format Spatial and attribute information http://water.usgs.gov/GIS/dsdl/SIR2010_5193_ha1000.shape.zip None. This data set is provided by USGS as a public service. 20081104 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 FGDC Content Standards for Digital Geospatial Metadata FGDC-STD-001-1998