Faunt, Claudia C. 2012 vector digital data Reston, Virginia U.S. Geological Survey http://water.usgs.gov/lookup/getspatial?pp1766_BAS6 Faunt, Claudia C. (editor) 2009 Reston, Virginia U.S. Geological Survey 3 chapters, 1 appendix This digital dataset defines the model grid, active model cells in the 10 model layers, and hydraulic-head values in the 10 model layers used to initiate the transient hydrologic model of the Central Valley flow system. The Central Valley encompasses an approximate 50,000 square-kilometer region of California. The complex hydrologic system of the Central Valley is simulated using the USGS numerical modeling code MODFLOW-FMP (Schmid and others, 2006). This simulation is referred to here as the Central Valley Hydrologic Model (CVHM) (Faunt, 2009). Utilizing MODFLOW-FMP, the CVHM simulates groundwater- and surface-water flow, irrigated agriculture, land subsidence, and other key processes in the Central Valley on a monthly basis from 1961-2003. The total active modeled area is 20,334 square-miles on a finite-difference grid comprising 441 rows and 98 columns. Slightly less than 50 percent of the cells are active. The CVHM grid has a uniform horizontal discretization of 1x1 square mile and is oriented parallel to the valley axis, 34 degrees west of north (Faunt, 2009). The starting heads are based on the water table and potentiometric surface developed by Williamson and others (1989). The CVHM is the most recent regional-scale model of the Central Valley developed by the U.S. Geological Survey (USGS). The CVHM was developed as part of the USGS Groundwater Resources Program (Faunt, 2009. See "Foreword", Chapter A, page iii, for details). The active cells and initial hydraulic-head values were used as input to MODFLOW-FMP, the USGS 3-dimensional finite-difference code used to simulate flow in the CVHM. The one-square-mile cells were used to define the resolution and extent of the CVHM. The CVHM is a tool that accounts for integrated, variable water-supply and -demand, and simulates surface-water and groundwater-flow across the entire Central Valley system. The CVHM dataset of active cells and initial hydraulic-head is one of many layers in a geospatial database supporting the USGS Central Valley Groundwater Availability Project. Regional groundwater availability studies quantify current groundwater resources, evaluate how those resources have changed through time, and provide tools that decision makers can use to predict system responses to future development and climate variability and change. To provide information to stakeholders addressing these issues, the USGS made a detailed assessment of groundwater availability of the Central Valley aquifer system, which includes: (1) the present status of groundwater resources; (2) characterization of how these resources have changed over time; and (3) tools to assess system responses to stresses from future human uses and climate variability and change. This effort builds on previous investigations, such as the USGS Central Valley Regional Aquifer System and Analysis (CV-RASA) project and several other groundwater studies in the Valley completed by Federal, State and local agencies at various scales. Data from these previous studies were the foundation of the Central Valley geospatial database. These and other data were re-examined through a series of regional-scale hydrologic investigations to provide updated and spatially consistent interpretations for the Central Valley Groundwater Availability study. In some cases, new data were collected to augment existing information. Data compiled from the studies include geology (in particular, borehole lithology and the extent and thickness of the Corcoran Clay Member of the Tulare Formation), topography, remote sensing, climate (precipitation and temperature), geophysics, vegetation and land use, vegetation properties, hydrology (stream network and flows), groundwater levels, subsidence, chemistry, and soils. Digital elevation models, geologic maps, borehole information, cross sections, and other 3-dimensional models were used to develop the texture model which represents the properties and geometry of the Central Valley alluvial deposits. The resulting geospatial database supports characterization and conceptualization of the Central Valley hydrologic system between 1961 and 2003, construction of 3-dimensional hydrogeologic framework and hydrologic flow models, and visualization of analysis and model results. 2012 publication date Complete None planned -123.831528 -117.916328 40.748631 34.519871 ISO 19115 Topic Category inlandWaters geoscientificinformation American Geological Institute Glossary of Geology (http://glossary.agiweb.org/dbtw-wpd/glossary/search.aspx) hydrology hydrogeology groundwater model hydraulic head none Central Valley Aquifer Central Valley Hydrologic Model Texture Model Flow Model CVHM CV-RASA Groundwater Availability of the Central Valley Aquifer discretization U.S. Board of Geographic Names (BGN) and Geographic Names Information System (GNIS) California Central Valley Trinity County Shasta County Tehama County Humboldt County Butte County Mendocino County Glenn County Yuba County Lake County Nevada County Colusa County Sutter County Placer County El Dorado County Yolo County Sonoma County Napa County Sacramento County Amador County Solano County Calaveras County Tuolumne County San Joaquin County Contra Costa County Stanislaus County Alameda County Mariposa County Madera County Merced County Fresno County Santa Clara County San Benito County Monterey County Tulare County Kings County Kern County San Luis Obispo County Santa Barbara County Ventura County Sacramento Valley San Joaquin Valley Central Valley, California 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 dataset in nonproprietary form, as well as in ArcGIS format, this metadata file may include some ArcGIS-specific terminology. Claudia C. Faunt U.S. Geological Survey Hydrologist mailing and physical address

California Water Science Center

San Diego California 92101 USA (619) 225-6142 (619) 225-6101 ccfaunt@usgs.gov http://water.usgs.gov/GIS/browse/pp1766_BAS6.png Illustration of the dataset. png Spatial datasets supporting the Central Valley Groundwater Availability project were developed primarily by the U.S. Geological Survey's (USGS) Groundwater Resources Program. This program is conducting large-scale multidisciplinary regional studies of groundwater availability. The U.S. Bureau of Reclamation is supporting the updating of the Central Valley datasets and their documentation and release. Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 3; ESRI ArcCatalog 9.3.1.3500 Schmid, Wolfgang Hanson, R. T. Maddock, Thomas, III Leake, S. A. 2006 Techniques and Methods 6-A17 Sacramento, CA USGS California Water Science Center http://pubs.usgs.gov/tm/2006/tm6A17/ 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. 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. All vertices that define the shape of the line are represented by a unique coordinate pair. The polygon features in this dataset are computer-generated and represent the model grid and model layers of the Central Valley Hydrologic Model. The dataset is complete and is not anticipated to change. Horizontal positional accuracy of line features in the dataset was tested by visually comparing to digital maps in the region by using a GIS system. Faunt, C. C. Hanson, R.T. Belitz, K. Schmid, W. Predmore, S.P. Rewis, D.L. McPherson, K. 2009 document U.S. Geological Survey Professional Paper 2009-1766 Reston, Virginia U.S. Geological Survey http://pubs.usgs.gov/pp/1766/PP_1766.pdf Faunt, C.C. 2009 U.S. Geological Survey Professional Paper 2009-1766 Reston, Virginia U.S. Geological Survey 500000 online 2009 publication date Faunt and others (2009) See Professional Paper 1766 - Groundwater Availability of the Central Valley Aquifer, California. Williamson, A. K. Prudic, D. E. Swain, L. A. 1989 Professional Paper 1401-D Reston, VA U.S. Geological Survey http://pubs.usgs.gov/pp/1401d/report.pdf online 2009 publication date Williamson and others (1989) attribute values Davis, G. H. Green, J. H. Olmsted F. H. Brown, D. W. 1959 Water Supply Paper 1469 Washington, D.C. U.S. Government Printing Office http://pubs.usgs.gov/wsp/1469/report.pdf online 2009 publication date Davis and others (1959) Central Valley major geomorphic provinces Olmsted, F. H. Davis, G. H. 1961 Water Supply Paper 1497 Washington, D.C. U.S. Government Printing Office http://pubs.usgs.gov/wsp/1497/report.pdf online 2009 publication date Olmstead and Davis (1961) Central Valley major geomorphic provinces Jennings, C.W. 1977 Sacramento, CA California Department of Conservation, Division of Mines and Geology http://archive.org/details/explanatorytextt00jennrich online 2009 publication date Jennings (1977) Central Valley major geomorphic provinces Page, R. W. 1986 Professional Paper 1401-C Reston, VA U.S. Geological Survey http://pubs.usgs.gov/pp/1401c/report.pdf online 2009 publication date Page (1986) Corcoran Clay Burow, Karen R. Shelton, Jennifer L. Hevesi, Joseph A. Weissmann, Gary S. 2004 vector digital data Scientific Investigations Report 2004-5232 Reston, VA U.S. Geological Survey http://pubs.usgs.gov/sir/2004/5232/sir_2004-5232.pdf online 2009 publication date Burow and others (2004) Corcoran Clay Weissmann, G.S. Bennett, G. Lansdale, A.L. 2005 vector digital data Special Publications 251 London, England, UK Geological Society of London http://epswww.unm.edu/facstaff/weissman/GSW_website/pubs/SP251-169-2006.pdf online 2009 publication date Weissmann alluvial fans of the San Joaquin Basin A GIS was used to develop a polygon file representing the flow-model grid layers. Faunt and others (2009) 20090420 10482600 Faunt and others (2009) Faunt, C.C. USGS Hydrologist mailing and physical address

4165 Spruance Road, Suite 200

San Diego CA 92101 USA (619) 225-6142 ccfaunt@usgs.gov Central Valley, comprised of the Sacramento Valley on the north and the San Joaquin Valley on the south, located in the state of California. Vector G-polygon 43218 Albers Conical Equal Area 29.500000 45.500000 -120.000000 23.000000 0.000000 0.000000 coordinate pair 1609.0 1609.0 meters North American Datum of 1983 Geodetic Reference System 80 6378137.000000 298.257222 North American Vertical Datum of 1988 0.000010 feet Explicit elevation coordinate included with horizontal coordinates BAS6 Basic Package - Defines the initial conditions and some of the boundary conditions of the model (Harbaugh and others, 2000) dataset originator FID Internal feature number. ESRI Sequential unique whole numbers that are automatically generated. OBJECTID Internal feature number. ESRI Sequential unique whole numbers that are automatically generated. Shape Feature geometry. ESRI Coordinates defining the features. CELLNUM Hydrologic model grid cell number dataset originator 1 43218 Integer ROW Hydrologic model grid row number dataset originator 1 441 Integer COLUMN_ Hydrologic model grid column number dataset originator 1 98 Integer 1 98 Integer lay1_act Cell Activity, model layer 1 dataset originator 1 Active, and Layer 1 is the uppermost active layer dataset originator 0 bedrock or inactive dataset originator lay2_act Cell Activity, model layer 2 dataset originator 0 bedrock or inactive dataset originator 1 Active, and Layer 1 is the uppermost active layer dataset originator 2 Active, and Layer 2 is the uppermost active layer dataset originator 98 layers 4 and 5 where the Corcoran Clay does not exist dataset originator lay3_act Cell Activity, model layer 3 dataset originator 0 bedrock or inactive dataset originator 1 Active, and Layer 1 is the uppermost active layer dataset originator 2 Active, and Layer 2 is the uppermost active layer dataset originator lay45_act Cell Activity, model layers 4 and 5 - Corcoran Clay dataset originator 0 bedrock or inactive dataset originator 51 Corcorcan exists and <10 ft thick (87 cells) dataset originator 52 Corcoran clay exists and between 10 and 20 ft thick (975 cells) dataset originator 53 Corcoran clay exists and > 20 ft thick and deeper than 30 ft from landsurface (5224 cells) dataset originator 98 layers 4 and 5 where the Corcoran Clay does not exist (11905 cells) dataset originator lay6_act Cell Activity, model layer 6 dataset originator 0 bedrock or inactive dataset originator 1 Active, and Layer 1 is the uppermost active layer dataset originator 2 Active, and Layer 2 is the uppermost active layer dataset originator lay7_act Cell Activity, model layer 7 dataset originator 0 bedrock or inactive dataset originator 10 area 10 - Redding dataset originator 11 area 11 - Western Sacramento dataset originator 12 area 12 - Eastern Sacramento dataset originator 20 area 20 - Northwest San Joaquin (Stockton) dataset originator 21 area 21 - Southwest San Joaquin (Westlands) dataset originator 22 area 22 - Northeast San Joaquin dataset originator 23 area 23 - East Central San Joaquin dataset originator 24 area 24 - Southeast San Joaquin dataset originator 30 area 30 - Tulare dataset originator 60 below corcoran dataset originator 81 San Joaquin dataset originator 99 upper layer of bedrock dataset originator lay8_act Cell Activity, model layer 8 dataset originator 0 bedrock or inactive dataset originator 10 area 10 - Redding dataset originator 11 area 11 - Western Sacramento dataset originator 12 area 12 - Eastern Sacramento dataset originator 20 area 20 - Northwest San Joaquin (Stockton) dataset originator 21 area 21 - Sourthwest San Joaquin (Westlands) dataset originator 22 area 22 - Northeast San Joaquin dataset originator 23 area 23 - East Central San Joaquin dataset originator 24 area 24 - Southeast San Joaquin dataset originator 30 area 30 - Tulare dataset originator 60 below corcorcan dataset originator 81 San Joaquin dataset originator 99 upper layer of bedrock dataset originator lay9_act Cell Activity, model layer 9 dataset originator 0 bedrock or inactive dataset originator 10 area 10 - Redding dataset originator 11 area 11 - Western Sacramento dataset originator 12 area 12 - Eastern Sacramento dataset originator 20 area 20 - Northwest San Joaquin (Stockton) dataset originator 21 area 21- Southwest San Joaquin dataset originator 22 area 22 - Northeast San Joaquin dataset originator 23 area 23 - East Central San Joaquin dataset originator 24 aera 24 - Southeast San Joaquin dataset originator 30 area 30 - Tulare dataset originator 60 below corcoran dataset originator 81 San Joaquin dataset originator 99 upper layer of bedrock dataset originator lay10_act Active Cells dataset originator 0 bedrock or inactive dataset originator 10 area 10 - Redding dataset originator 11 area 11 - Western Sacramento dataset originator 12 area 12 - Eastern Sacramento dataset originator 20 area 20 - Northwest San Joaquin (Stockton) dataset originator 21 area 21 - Southwest San Joaquin (Westlands) dataset originator 22 area 22 - Northeast San Joaquin dataset originator 23 area 23 - East Central San Joaquin dataset originator 24 area 24 - Southeast San Joaquin dataset originator 30 area 30 - Tulare dataset originator 60 below corcoran dataset originator 81 San Joaquin dataset originator 99 upper layer of bedrock dataset originator strt_hd_01 Starting heads based on Williamson and others (1989) dataset originator -5.5 191.5 feet -9999 no data Metadata author strt_hd_02 Starting heads based on Williamson and others (1989) dataset originator -5.6 191.2 feet -9999 no data dataset originator strt_hd_03 Starting heads based on Williamson and others (1989) dataset originator -5.6 265.7 feet -9999 no data dataset originator strt_hd_04 Starting heads based on Williamson and others (1989) dataset originator -9999 no data dataset originator -56.3 218.4 feet strt_hd_05 Starting heads based on Williamson and others (1989) dataset originator -80.6 218.4 feet -9999 no data dataset originator strt_hd_06 Starting heads based on Williamson and others (1989) dataset originator -116.5 206.8 feet -9999 no data dataset originator strt_hd_07 Starting heads based on Williamson and others (1989) dataset originator -115.1 198.7 feet -9999 no data dataset originator strt_hd_08 Starting heads based on Williamson and others (1989) dataset originator -118.4 175.8 feet -9999 no data dataset originator strt_hd_09 Starting heads based on Williamson and others (1989) dataset originator -138.6 160.7 feet -9999 no data dataset originator strt_hd_10 Starting heads based on Williamson and others (1989) dataset originator -120 178.9 feet -9999 no data dataset originator Each model grid polygon feature has 25 attributes. Three attributes are automatically generated by the GIS (FID, OBJECTID, Shape) for internal software purposes. The remaining attributes were assigned by the author (Citation Originator) to define active model cells and starting heads (based on Williamson and others (1989)). none. U.S. Geological Survey Ask USGS -- Water Webserver Team mailing address

445 National Center

Reston VA 20192 USA 1-888-275-8747 (1-888-ASK-USGS) http://water.usgs.gov/user_feedback_form.html Downloadable Data Digital geospatial datasets for the numerical model of the hydrogeologic landscape and groundwater flow in California's Central Valley. 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. SHP ESRI Shapefile unzip 5.605 http://water.usgs.gov/GIS/dsdl/pp1766_BAS6.zip None. This dataset is provided by the USGS as a public service. 2011 20120824 U.S. Geological Survey Ask USGS -- Water Webserver Team mailing address

445 National Center

Reston VA 20192 USA 1-888-275-8747 (1-888-ASK-USGS) http://answers.usgs.gov/cgi-bin/gsanswers?pemail=h2oteam&subject=GIS+Datase+pp1766_BASE FGDC Content Standards for Digital Geospatial Metadata FGDC-STD-001-1998