Faunt, Claudia C. 2006 map Digital geospatial data sets for the hydrogeologic framework and transient ground-water flow model, Death Valley regional ground-water flow system, Nevada and California subreg_sir045205 Reston, Virginia U.S. Geological Survey http://water.usgs.gov/lookup/getspatial?sir045205_subreg Belcher, W.R. and Sweetkind, D.S. (editors) 2010 U.S. Geological Survey Professional Paper 1711 Reston, Virginia U.S. Geological Survey 6 chapters, 2 appendices, 2 plates, 403 p. http://pubs.er.usgs.gov/publication/pp1711 Belcher, W.R. (editor) 2004 U.S. Geological Survey Scientific Investigations Report 2004-5205 Reston, Virginia U.S. Geological Survey 6 chapters, 2 appendices, 2 plates, 408 p. http://pubs.usgs.gov/sir/2004/5205/ This digital data set defines the subregions of the transient ground-water flow model of the Death Valley regional ground-water flow system (DVRFS). Subregions are used to more readily describe and evaluate the source, occurrence, and movement of ground water within and between the smaller areas of the DVRFS, which is an approximately 45,000 square-kilometer region of southern Nevada and California. The subregions, first described by D'Agnese and others (1997), consist of a northern, central, and southern subregion. The subregions are defined by grouping ground-water sections into ground-water basins and ultimately grouping ground-water basins into ground-water subregions. Where applicable, ground-water flow paths were used to modify the section boundaries so that the basin and subregion boundaries do not always coincide with the section boundaries. The subregions, basins, and sections are used for descriptive purposes only and do not define independent flow systems. The subregions, basins, and sections are delineated primarily on (1) location of recharge areas; (2) regional hydraulic gradients; (3) distribution of aquifers, structures, and confining units that affect flow; (4) location of major discharge areas; and (5) hydrochemical composition of the ground water. The subregions of the DVRFS were developed to evaluate and describe the DVRFS at a sub-regional scale. Specifically, the DVRFS subregions are used for analyzing ground-water flow by subregions, basins, and sections; and for describing specific areas within the DVRFS. The subregions of the DVRFS data set are one of many layers in a geospatial database supporting the USGS DVRFS project. During that 5-year (1998-2004) project the USGS, in cooperation with DOE and other Federal, State, and local agencies, developed this geospatial database for a regional-scale, 3D hydrogeologic framework model (HFM) and a ground-water flow model. The models are intended to address water-resource issues and the potential movement of radioactive material from the Nevada Test Site and the proposed high-level nuclear waste repository at Yucca Mountain, Nevada. Data from two previous ground-water flow models of the greater Death Valley region (see "Larger Work Citation", Chapter A, p. 7) were the foundation of the DVRFS geospatial database. Those and other data were reexamined through a series of regional-scale hydrologic investigations to provide updated and spatially consistent interpretations for the DVRFS study. In some cases, new data were collected to augment the existing information. Data compiled from the studies include natural ground-water discharge occurring through evapotranspiration and spring flow; ground-water pumping for the period 1913-98; ground-water recharge simulated as net infiltration; ground-water inflow and outflow at lateral model boundaries; hydraulic conductivity and its relation to depth and other rock properties; and the estimation of water levels representative of prepumped and pumped conditions in the region. Digital elevation models, geologic maps, borehole information, cross sections, and other 3D models were used to develop the HFM and represent the geometry of 27 hydrogeologic units and structural features. The resulting geospatial database supports characterization and conceptualization of the DVRFS, construction of 3D hydrogeologic framework and ground-water flow models, and visualization of analysis and model results. 2006 publication date Complete None planned -117.711710 -114.976345 38.123091 35.482023 USGS Water Basics Glossary. Accessed May 3, 2005 at http://capp.water.usgs.gov/GIP/h2o_gloss/; American Geological Institute Glossary of Geology Death Valley regional ground-water flow system evapotranspiration flow model ground water ground-water discharge ground-water pumping ground-water recharge hydraulic conductivity hydraulic head hydraulic-head observation hydrogeologic framework model hydrogeology hydrology lateral ground-water flow lateral ground-water model boundary net infiltration spring flow steady state ground-water model transient ground-water model water level water well U.S. Board of Geographic Names (BGN) and Geographic Names Information System (GNIS) Amargosa Desert Ash Meadows California Valley Chicago Valley China Ranch Clark County Clayton Valley Coal Valley Death Valley eastern California Esmeralda County Eureka Valley Franklin Lake Garden Valley Inyo County Kern County Las Vegas Valley Lincoln County Mesquite Valley Mineral County Mono County Nevada Nevada Test Site Nye County Oasis Valley Owlshead Mountains Pahranagat Range Pahrump Valley Panamint Range Penoyer Valley Railroad Valley Resting Spring Saline Valley San Bernardino County Sarcobatus Flat Sheep Range Shoshone Silurian Valley southern Nevada Spring Mountains Stewart Valley Stone Cabin Valley Tecopa Yucca Mountain California Franklin Well None Data have been checked to ensure the accuracy of the data. If any errors are detected, please notify the originating office. The U.S. Geological Survey strongly recommends that careful attention be paid to the metadata file associated with these data. The U.S. Geological Survey shall not be held liable for improper or incorrect use of the data described and (or) contained herein. Acknowledgement of the U.S. Geological Survey would be appreciated in products derived from these data. 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 Federal Geographic Data Committee-compliant metadata file is intended to document the data set in nonproprietary form, as well as in ArcGIS format, this metadata file may include some ArcGIS-specific terminology. U.S. Geological Survey Claudia Faunt mailing and physical address

California Water Science Center

San Diego Projects Office

4165 Spruance Road, Suite 200

San Diego California 92101 USA (619) 225-6142 (619) 225-6101 ccfaunt@usgs.gov http://water.usgs.gov/GIS/browse/sir045205_subreg.jpg Illlustration of data set jpg Spatial data sets supporting the Death Valley regional ground-water flow system (DVRFS) project were developed in cooperation with the U.S. Department of Energy (DOE) National Nuclear Security Administration/Nevada Site Office (NNSA/NSO) Underground Test Area (UGTA) project of the Office of Environmental Management, the NNSA/NSO Hydrologic Resource Management Program (HRMP), the Office of Civilian Radioactive Waste Management (OCRWM) Yucca Mountain Project (YMP), the NNSA/NSO Maintenance of Test Capability (MTC) program, and the National Park Service (NPS). Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 2; ESRI ArcCatalog 9.1.0.722 Attributes added by the GIS and the data set author were checked by inspection using a GIS. In addition, attributes were checked and evaluated as part of the review process associated with the publication of the source report. Lines forming the polygons join at endpoints to completely enclose areas. Lines do not intersect, and no duplicate line features exist. All endpoints are represented by a single coordinate pair which indicates the beginning or end of a line. The polygon features in this data set were originally digitized from hard copy in Cardinalli and others (1968) and Harrill and Prudic (1998). The resulting digital data set was later modified by D'Agnese and others (2002) and Belcher (2004). The data set is complete and is not anticipated to change. The accuracy of the compiled digital line features in the data set is based upon the accuracy of source maps and digital data sets which are compiled to meet National Map Accuracy Standards. Horizontal positional accuracy was tested by visually comparing these line features to source maps using a GIS and hardcopy plots. Cardinalli, J.L. Roach, L.M. Rush, F.E. Vasey, B.J. 1968 map Rush, F.E. 1968 document Information Series Report 6 Carson City, Nevada Nevada Department of Conservation and Water Resources 500,000 paper 1968 publication date Cardinalli and others (1968) Base map used to compile hydrographic areas (sections). Harrill, J.R. Prudic, D.E. 1998 map Professional Paper 1409-A Reston, Virginia U.S. Geological Survey 66 p. paper 1998 publication date Harrill and Prudic (1998) Figure 2 and Table 1 define the Death Valley flow system subregion. D'Agnese, F.A. Faunt, C.C. Turner, A.K. Hill, M.C. 1997 map U.S. Geological Survey Water-Resources Investigations Report 96-4300 Reston, Virginia U.S. Geological Survey 124 p. http://pubs.er.usgs.gov/pubs/wri/wri964300 250,000 online 1997 publication date D'Agnese and othres (1997) Source data used to develop subregion map. D'Agnese, F.A. O'Brien, G.M. Faunt, C.C. Belcher, W.R. San Juan, C.A. 2002 map U.S. Geological Survey Water-Resources Investigations Report 02-4102 Reston, Virginia U.S. Geological Survey http://pubs.water.usgs.gov/wri024102/ 250,000 online 2002 publication date D'Agnese and others (2002) Digital data used to develop output data set. Faunt, C.C. D'Agnese, F.A. O'Brien, G.M. 2004 map Chapter D, p. 145-156 Belcher, W.R. (ed.) 2004 U.S. Geological Survey Scientific Investigations Report 2004-5205 Reston, Virginia U.S. Geological Survey http://pubs.usgs.gov/sir/2004/5205/ 250,000 online 2004 publication date Faunt and others (2004) Output data set. Polygon features defining subregions within the DVRFS were developed by attributing hydrographic sections. Polygons representing hydrographic sections, were modified from Cardinalli and others (1968) and Harrill and Prudic (1998). Polygon features were extracted or generalized from acquired hard copy and digital maps using a GIS. Extracted line features were obtained using queries, while generalized line features were constructed by digitizing select lines from source maps. D'Agnese and others (1997) defined the hydrologic sections to form the ground-water basins and subregions based on distinct flow paths. The definitions of hydrologic sections, ground-water basins and subregions were used for descriptive purposes, and did not define discrete independent flow systems. D'Agnese and others (2002) expanded the areal extent of the 1997 version of the DVRFS subregion map to include the area of the DVRFS steady-state model domain. The DVRFS subregion map was subsequently modified by Faunt and others (2004) for use with the DVRFS transient ground-water flow model. Cardinalli and others (1968) Harrill and Prudic (1998) D'Agnese and others (1997) D'Agnese and others (2002) Faunt and others (2004) 1997-2004 Vector G-polygon 21 Universal Transverse Mercator 11 0.999600 -117.000000 0.000000 500000.000000 0.000000 coordinate pair 0.000512 0.000512 meters North American Datum of 1927 Clarke 1866 6378206.400000 294.978698 Subregion of a ground-water flow system A portion of a regional flow system characterized by distinct flow paths. D'Agnese and others (1997) FID Internal feature number. Environmental Systems Research Institute, Inc. (ESRI) Sequential unique whole numbers that are automatically generated. Shape Feature geometry. ESRI Coordinates defining the features. Section Name identifying hydrographic areas. D'Agnese and others (1997) Hydrographic areas modified from Cardinalli and others (1968) and Harrill and Prudic (1998). GW_Basin Major subregional flow system based on flow paths and named according to the part of Death Valley where discharge occurs. D'Agnese and others (1997) Names identifying major subregional flow system areas that are based on flow paths and named according to the part of Death Valley where discharge occurs. Subregion Major subregional flow system based on flow paths and named according to the part of Death Valley where discharge occurs. D'Agnese and others (1997) Northern That portion of the subregional flow system discharging into the northern part of Death Valley. D'Agnese and others (1997) Central That portion of the subregional flow system discharging into the central part of Death Valley. D'Agnese and others (1997) Southern That portion of the subregional flow system discharging into the southern part of Death Valley. D'Agnese and others (1997) Each polygon feature has 5 attributes. Two attributes are automatically generated by the GIS (FID, Shape) for internal software purposes. The remaining attributes were assigned by the author (Point of Contact) for analysis and[or] descriptive purposes. - U.S. Geological Survey Ask USGS - Water Webserver Team mailing and physical address

445 National Center

Reston VA 20192 USA 1-888-275-8747 http://water.usgs.gov/user_feedback_form.html Contact via email or phone. Digital geospatial data sets for the transient ground-water flow model and hydrogeologic framework model, Death Valley regional ground-water flow system, Nevada and California 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 accuracy or utility of the data on any other system or for general or scientific purposes, nor shall the act of distribution constitute any such warranty. This disclaimer applies both to individual use of the data and aggregate use with other data. These data should be directly acquired from a U.S. Geological Survey server, and not indirectly through other sources that may have altered the data in some way. Shapefile 1.0 Unzip 76 Kilobytes http://water.usgs.gov/GIS/dsdl/subreg_sir045205.zip None 20070816 U.S. Geological Survey mailing address

445 National Center

Reston Virginia 20192 USA 1-888-275-8747 (1-888-ASK-USGS) http://answers.usgs.gov/cgi-bin/gsanswers?pemail=h2oteam&subject=GIS+Dataset+sir045205_subreg FGDC Content Standards for Digital Geospatial Metadata FGDC-STD-001-1998