Faunt, Claudia C. 2006 vector digital data Digital geospatial data sets for the hydrogeologic framework and transient ground-water flow model, Death Valley regional ground-water flow system, Nevada and California pot_wri974052 Reston, Virginia U.S. Geological Survey http://water.usgs.gov/lookup/getspatial?sir045205_pot_wri974052 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/ D'Agnese and others (1998) developed a potentiometric surface to conceptualize the regional ground-water flow system and to construct numerical flow models of the Death Valley region, Nevada and California. The estimated potentiometric surface was derived using a gridding algorithm and interactive editing to produce contours representative of the natural water-table conditions. Input data included the altitudes of lakes, springs, and wetlands; water-level data from wells; and hydrogeologic information pertaining to areas of recharge, discharge, and low- permeability rocks The regional potentiometric-surface contour map by D'Agnese and others (1998) was used to make initial estimates of regional hydraulic head for the Death Valley regional ground-water flow system (DVRFS) numerical model. The surface was also used during model calibration to compare hydraulic heads and gradients spatially within the DVRFS, Nevada and California. The estimated potentiometric surface by D'Agnese and others (1998) is one of many layers in a geospatial database supporting the USGS DVRFS project. During this 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 which represents 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. 1998 publication date Complete None planned -117.707352 -115.077818 37.951214 35.258248 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 flow model ground water ground-water discharge ground-water recharge hydraulic conductivity hydraulic head hydrogeology hydrology water level water well U.S. Board of Geographic Names (BGN) and Geographic Names Information System (GNIS) Amargosa Desert Ash Meadows California California Valley Chicago Valley China Ranch Clark County Clayton Valley Coal Valley Death Valley Esmeralda County Eureka Valley Franklin Lake Franklin Well 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 Bernadino County Sarcobatus Flat Sheep Range Shoshone Silurian Valley southern Nevada Spring Mountains Stewart Valley Stone Cabin Valley Tecopa Yucca Mountain 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 ccfaunt@usgs.gov http://water.usgs.gov/GIS/browse/sir045205_pot_wri974052.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 generated by the GIS and added by D'Agnese and others (1998) 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 (D'Agnese and others, 1998) . Lines forming polygons join at endpoints to completely enclose defined areas. Lines not enclosing areas do not intersect. No duplicate line features exist and all nodes are represented by a single coordinate pair which indicates the beginning or end of a line. The polygon and line features in this data set were based on water-level data compiled in 1990. The data were considered sufficiently representative of regional ground-water conditions in the Death Valley area to generate the resulting contours. The data set is complete and is not anticipated to change. Horizontal positional accuracy of line features in the data set was tested by visually comparing to digital source maps using a GIS system. The vertical accuracy of the potentiometric contours can be estimated at control points such as water wells, springs and lakes. The altitude of springs and lakes was estimated from Digital Elevation Model (DEM) data that has an expected absolute vertical error of 30 meters. The accuracy of land-surface altitude at a well location is indicated by the altitude accuracy code reported in Ground Water Site Inventory (GWSI). Altitude accuracy codes are expressed as a plus/minus (±) range related directly to the method by which the altitude was determined. Ranges vary from about ±0.03 m for high-precision methods, such as spirit level and GPS surveying, to about ±25 m for estimates determined from topographic maps having large (50 m) contour intervals. D’Agnese, F.A. Faunt, C.C. Turner, A.K. 1998 map Water-Resources Investigations Report 97-4052 Reston, Virginia U.S. Geological Survey Plate 1 http://pubs.er.usgs.gov/usgspubs/wri/wri974052 500,000 online 1998 publication date D'Agnese and others (1998) Digital data acquired for DVRFS project. D'Agnese and others (1998) compiled regional water-level data obtained from the USGS National Water Inventory System (NWIS) database. Data were interpolated using the Schlumberger-GeoQuest CPS-3 convergent gridding algorithm at a grid-cell spacing of 558 m by 558m. The preliminary contours were manually edited to produce the final potentiometric-surface contours reflecting regional topographic, geologic, and hydrologic system conditions. 1990 Vector String 207 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 Regional ground-water potential contour Line representing a constant value of total ground-water head. Author (Metadata Contact Person) 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. ELEV Altitude of potentiometric surface in meters above sea level; contour interval 100 meters. D'Agnese and others (1998) 0.0 2300.0 meters Each line feature has 3 attributes. Two attributes are automatically generated by the GIS (FID, Shape) for internal software purposes. The remaining attribute was assigned by the D'Agnese and others (1998) 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 627 Kilobytes http://water.usgs.gov/GIS/dsdl/pot_wri974052.zip None 20061117 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_pot_wri974052 FGDC Content Standards for Digital Geospatial Metadata FGDC-STD-001-1998