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 model_cells Reston, Virginia U.S. Geological Survey http://water.usgs.gov/lookup/getspatial?sir045205_model_cells 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 model grid and infiltration values simulated in the transient ground-water flow model of the Death Valley regional ground-water flow system (DVRFS), an approximately 45,000 square-kilometer region of southern Nevada and California. The DVRFS model grid is north-south-oriented, consists of 194 rows and 160 columns, and has a constant grid-cell spacing of 1,500 meters. Model cells are attributed with infiltration rates that are used as a component of recharge in the flow model. The DVRFS transient ground-water flow model is one of 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). The model grid and infiltration values were used to develop input to MODFLOW-2000, the USGS 3D finite-difference code used to simulate ground-water flow in the DVRFS. The infiltration rates represent one component of recharge simulated in the DVRFS transient ground-water flow model. The model grid and infiltration data set forms one of many layers 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", 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 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 -117.718697 -114.981308 38.120690 35.481569 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 recharge hydraulic conductivity hydrogeology hydrology infiltration model grid MODFLOW-2000 net infiltration transient ground-water model 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 (619) 225-6101 ccfaunt@usgs.gov http://water.usgs.gov/GIS/browse/sir045205_model_cells.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 polygons join at endpoints to completely enclose defined areas. No duplicate polygon features or pseudo nodes exist. Nodes are represented by a single coordinate pair that indicates the starting/ending point of the line forming the polygon. All vertices that define the shapes of the polygons are represented by unique coordinate pairs. The polygon features in this data set are computer-generated by the author (Point of Contact) to represent the model grid of the DVRFS numerical flow model. The DVRFS model grid contains 160 columns and 194 rows. The data set is complete and is not anticipated to change. Horizontal positional accuracy of line features in the data set was confirmed by visually comparing hard copy plots to the original source maps. San Juan, C.A. Belcher, W.R. Laczniak, R.J. Putnam, H.M. 2004 Chapter C 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 San Juan and others (2004) Source for model infiltration rates Faunt, C.C. Blainey, J.B. Hill, M.C. D'Agnese, F.A. O'Brien, G.M. 2004 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) Source of model grid data Harbaugh, J.W. Banta, E.R. Hill, M.C. McDonald, M.G. 2000 document U.S. Geological Survey Open-File Report 00-92 Reston, Virginia U.S. Geological Survey 121 p. http://pubs.er.usgs.gov/usgspubs/ofr/ofr0092 online 2000 publication date Harbaugh and others (2000) MODFLOW-2000 user guide A GIS was used to develop a polygon layer representing the flow model grid that was 160 columns by 194 rows. Model cells (polygons) were attributed with row, column, boundary type (IBOUND), and infiltration (recharge) values. IBOUND is the boundary variable that designates which model cells are active, inactive or are constant-head values (Harbaugh and others, 2000, pp. 50-51). Compiled infiltration rates (San Juan and others, 2004) were resampled to the 1500-meter cell resolution and converted to model units of meters per day. In the DVRFS model, MODFLOW-2000 is used to convert the infiltration rates to simulated recharge values by multiplying by a uniform rate for various recharge zones. These recharge zones are based on relative values of hydraulic conductivity and magnitude of infiltration rate (see Faunt and others (2004) for more details). San Juan and others (2004) Faunt and others (2004) Harbaugh and others (2000) 2004 Vector G-polygon 31040 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 Model grid cell A discrete area in a horizontally-rectangular finite-difference model grid Author (Point of Contact) 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. IBOUND MODFLOW-2000 IBOUND array value MODFLOW-2000 0 Inactive model cell Metadata author 1 Active model cell; numerical model area (cell) where calculations are made Metadata author COLUMN Model grid column number Metadata Author 1 160 Integer ROW Model grid row number Metadata Author 1 194 Integer RECHARGE Infiltration rate applied to model cell Metadata Author 0.0 0.001073 meters per day Polygon features in this data set have 6 attributes. Attributes automatically generated by the GIS (FID, Shape) are for internal software purposes. The remaining attributes were assigned by the author (Point of Contact) for analytical purposes and or developing model input files. - 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 927 Kilobytes http://water.usgs.gov/GIS/dsdl/model_cells.zip None 20070814 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_model_cells FGDC Content Standards for Digital Geospatial Metadata FGDC-STD-001-1998