Faunt, Claudia C. 2006 Edition 2 which is an update from sir045205_hd1_t85_tr 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 hd1_t85_tr Reston, Virginia U.S. Geological Survey https://water.usgs.gov/lookup/getspatial?pp1711_hd1_t85_tr 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. https://pubs.usgs.gov/sir/2004/5205/ These contours represent the simulated potentiometric surface at the end of simulation (1998) in model layer 1 of the Death Valley regional ground-water flow system (DVRFS), an approximately 45,000 square-kilometer region of southern Nevada and California. The numerical ground-water flow model simulates prepumping conditions before 1913 and transient-flow conditions from 1913 to 1998 after pumping of ground water began. The DVRFS transient ground-water flow model is the most recent in a number of regional-scale models developed by the U.S. Geological Survey (USGS) for the U.S. Department of Energy (DOE) to support investigations at the Nevada Test Site (NTS) and at Yucca Mountain, Nevada (see "Larger Work Citation", Chapter A, page 8, for details). Contours in this data set were used to evaluate the spatial distribution of simulated hydraulic gradients and the potentiometric surface at the end of simulation (1998) in model layer 1 of the DVRFS numerical model. The simulated contours were also used to compare to alternate interpretations of the potentiometric surface altitudes, gradients, and/or observed data. Model output was produced using MODFLOW-2000, the USGS 3D finite-difference code used to simulate ground-water flow in the DVRFS. The potentiometric surface contours at the end of simulation (1998) model layer 1 is one of many data sets in a geospatial data base 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 data base 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", p. 7) were the foundation of the DVRFS geospatial database. These 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 data base supports characterization and conceptualization of the DVRFS, construction of 3D hydrogeologic framework and ground-water flow models, and visualization of analysis and model results. 2004 publication date Complete None planned -117.691126 -115.029481 37.918095 35.531306 USGS Thesaurus Death Valley regional ground-water flow system flow model ground water hydraulic head hydraulic-head observation hydrogeology hydrology MODFLOW-2000 steady-state ground-water model transient ground-water model inlandWaters ISO 19115 Topic Category geoscientificInformation inlandWaters environment USGS Metadata Identifier USGS:fdf62d06-e99f-4a84-9212-926a7cdbacc3 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

San Diego California 92101 USA (619) 225-6142 (619) 225-6101 ccfaunt@usgs.gov https://water.usgs.gov/GIS/browse/sir045205_hd1_t85_tr.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 The computer-generated attributes 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 in this data set do not intersect themselves or other lines, and no duplicate line features exist. All nodes are represented by a single coordinate pair which indicates the beginning or end of a line. All vertices that define the shape of the line are represented by a unique coordinate pair. The line features in this data set are computer-generated from hydraulic-head ASCII arrays simulated with MODFLOW-2000. Lines were generated at a 200-meter contour interval to form a representative potentiometric surface of the DVRFS ground-water flow system. The data set is complete and is not anticipated to change. Contours in this data set are computer-generated from raster hydraulic-head data output from the DVRFS model at a grid spacing of 1.5 kilometers. The "LATTICECONTOUR" command in ARC/INFO was used to generate the simulated potentiometric-surface contours. It is assumed that the error associated with the horizontal position of line features is one-half of a model cell, or 750 meters. Contours in this data set are computer-generated from raster hydraulic-head data output from the DVRFS model at a grid spacing of 1.5 kilometers. LATTICECONTOUR produces engineering-quality contours, representing an exact interpretation of the gridded simulated potentiometric surface. It is assumed that the error associated with the vertical position of line features is, at a maximum, the difference in altitude simulated for the potentiometric surface at two adjacent grid nodes. For this surface, the maximum difference is about 800 meters. Although beyond the scope of this data set, the actual vertical accuracy of the simulated contours is dependent on how well the simulated raster data represents the actual potentiometric surface of the DVRFS. Because the DVRFS grid spacing is 1.5 kilometers, there is one altitude value for each 2.25 square-kilometer cell within the model area. In general, the vertical accuracy of the simulated potentiometric head (contours) with respect to observed data is expected to decrease as the hydraulic gradient increases. Faunt and others (2004) present an assessment of the accuracy of simulated results in Chapter F of the Larger Work Citation. Faunt, C.C. Blainey, J.B. Hill, M.C. DAgnese, F.A. OBrien, G.M. 2004 map Chapter F Belcher, W.R., (ed.) 2004 document U.S. Geological Survey Scientific Investigations Report 2004-5205 Reston, Virginia U.S. Geological Survey http://water.usgs.gov/pubs/sir/2004/5205/ 250,000 online 2004 publication date Faunt and others (2004) Simulated hydraulic head data used to generate contours. Hill, M.C. Banta, E.R. Harbaugh, A.W. Anderman, E.R. 2000 document U.S. Geological Survey Open-File Report 00-184 Reston, Virginia U.S. Geological Survey http://water.usgs.gov/nrp/gwsoftware/modflow2000/ofr00-184.pdf online 2000 publication date MODFLOW-2000 3D finite-difference code used to simulate ground-water flow in the DVRFS Contours in this data set were computer-generated by Faunt and others (2004) using the "LATTICECONTOUR" linear-interpolation method available in ArcGIS, and a grid from the MODFLOW-2000 model representing the potentiometric surface at the end of simulation (1998) in model layer 1 of the DVRFS numerical model. LATTICECONTOUR produces contours representing an exact interpretation of the raster (lattice) surface model. When a contour falls exactly at the same elevation as a flat region, the contour is drawn on the sides with higher neighboring regions. Contours were generated using a 200-meter interval, and all are valid engineering-quality interpretations of the surface. Although computer-generated contours are often modified by hand for aesthetic purposes, these contours were not, since the surface was used for visualization and analysis purposes. Faunt and others (2004) MODFLOW-2000 2004 Vector String 57 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 Simulated potentiometric surface contour Line representing a constant value of hydraulic head simulated by a numerical ground-water flow model 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. CONTOUR Altitude of potentiometric surface (in meters referenced to North American Vertical Datum of 1988) Author (Metadata Contact Person) 0 2800 meter Each polygon feature has 3 attributes. Two attributes are automatically generated by the GIS (FID, Shape) for internal software purposes. The remaining attribute (Contour) was generated by a contouring algorithm (LATTICECONTOUR) used to develop the line features. - U.S. Geological Survey Michael Ierardi mailing and physical address

445 National Center

Reston VA 20192 USA 1-888-275-8747 mierardi@usgs.gov 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 50 https://water.usgs.gov/GIS/dsdl/hd1_t85_tr.zip None 20201117 U.S. Geological Survey mailing address

445 National Center

Reston Virginia 20192 USA 1-888-275-8747 (1-888-ASK-USGS) mierardi@usgs.gov FGDC Content Standards for Digital Geospatial Metadata FGDC-STD-001-1998