Faunt, Claudia C. 2012 vector digital data Reston, Virginia U.S. Geological Survey https://water.usgs.gov/lookup/getspatial?pp1766_virtual_well_perforations Faunt, Claudia C. (editor) 2009 Professional Paper 1766 Reston, Virginia U.S. Geological Survey 3 chapters, 1 appendix https://pubs.usgs.gov/pp/1766/PP_1766.pdf Abstract: This digital dataset contains the virtual wells used for pumpage for the Central Valley Hydrologic Model (CVHM). 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 U.S. Geological Survey (USGS) numerical modeling code MODFLOW-FMP (Schmid and others, 2006). This simulation is referred to here as the 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 model 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). Groundwater pumpage is a major part of the groundwater budget of the Central Valley, and is grouped into two categories for this study: agricultural and urban (which includes municipal and industrial sources). Discharge from agricultural wells rarely is metered in the Central Valley (Diamond and Williamson, 1983), and therefore must be estimated by indirect means. If consumptive use can be quantified, groundwater pumpage may be estimated by taking into account surface-water supply, irrigation efficiency, and effective precipitation. Irrigation efficiency, as used in this report, is the percentage of water delivered to the Water Balance Subregion (WBS) that is available for consumptive use. The newly developed MODFLOW-FMP uses this method (Schmid and others, 2006). Wells were simulated as a combination of farm wells (Schmid and others, 2006) and multi-node wells (Halford and Hanson, 2002) (Faunt, 2009; fig. C3). Farm wells are simulated in a manner similar to the WEL package (Harbaugh and others, 2000) and the pumpage is distributed among each of the farm wells (Schmid and others, 2006). Agricultural pumpage is estimated through the FMP. A single well that represents the composite of all wells within a model cell is referred to here as a virtual well. For the FMP, in each WBS, a virtual well was placed in each model cell where an irrigated crop was the predominant land use for a given time frame. Because the extent of irrigated agriculture changes through time, wells were added and deleted accordingly in the model during the simulation period. In general, wells were added through time because the extent of irrigated agriculture generally increases through time. In some areas, however, agricultural wells were replaced by urban wells in the model as the land use changed from agricultural to urban. The CVHM is the most recent regional-scale model of the Central Valley developed by the USGS.The CVHM was developed as part of the USGS Groundwater Resources Program (see "Foreword", Chapter A, page iii, for details). The virtual-well dataset was used as input to MODFLOW-FMP, the USGS 3-dimensional finite-difference code used to simulate flow in the CVHM. This is a supporting dataset that provides the CVHM with the location and perforated-intervals of the virtual wells. 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 virtual-well dataset 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. 2009 publication date Complete None planned -123.817869 -117.929761 40.738796 34.530078 ISO 19115 Topic Category hydrogeology geostatistics unconsolidated sediments inlandWaters USGS Thesaurus Central Valley Aquifer Groundwater Availability of the Central Valley Aquifer CV-RASA Central Valley Hydrologic Model Texture Model Flow Model CVHM virtual well inlandWaters American Geological Institute Glossary of Geology (http://glossary.agiweb.org/dbtw-wpd/glossary/search.aspx) hydrology hydrogeology model groundwater USGS Metadata Identifier USGS:17574433-a888-4be6-a78a-eca59c9a3ccb 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

4165 Spruance Road, Suite 200

San Diego CA 92101 USA (619) 225-6142 (619) 225-6101 ccfaunt@usgs.gov https://water.usgs.gov/GIS/browse/pp1766_virtual_well_perforations.png Illlustration of data set 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 Reclammation 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 https://pubs.usgs.gov/tm/2006/tm6A17/ K. J. Halford and R. T. Hanson 2002 model Open-File Report 02-293 Reston, VA U.S. Geological Survey https://pubs.usgs.gov/of/2002/ofr02293/text.html Diamond, Jonathan; Williamson, A. K. 1983 document Water-Resources Investigations Report 83-4037 Reston, VA U.S. Geological Survey https://pubs.usgs.gov/wri/1983/4037/report.pdf Harbaugh, Arlen W. Banta, Edward R. Hill, Mary C. McDonald, Michael G 2000 model Open-File Report 2000-92 Reston, VA U.S. Geological Survey http://water.usgs.gov/nrp/gwsoftware/modflow2000/ofr00-92.pdf There are no overlapping or duplicate grid cells. The features in this dataset virtual wells used for pumpage for the Central Valley Hydrologic Model (CVHM). The dataset is complete and is not anticipated to change. The model-grid centroid data were generated using a GIS. The upper and lower well-perforation depths were interpolated onto each model cell using a GIS. The aggregated perforation intervals and corresponding layers were assigned to the centroids. http://ca.water.usgs.gov/projects/cvhm/datasets/virtual_well_perforations.zip 04012005 Claudia C. Faunt U.S. Geological Survey Hydrologist mailing and physical address

4165 Spruance Road, Suite 200

San Diego CA 92101 USA 6192256142 ccfaunt@usgs.gov Vector Entity point 43218 Albers Conical Equal Area 29.500000 45.500000 -120.000000 23.000000 0.000000 0.000000 coordinate pair 100 100 meters North American Datum of 1983 Geodetic Reference System 80 6378137.000000 298.257222 Virtual Well Pumpage Virtual-well location and pumpage data dataset originator FID Internal feature number. ESRI Sequential unique whole numbers that are automatically generated. Shape Feature geometry. ESRI Coordinates defining the features. CELLNUM CVHM model-grid-cell number, beginning in northwest (upper left) and wrapping west to east (left to right) and south (down). dataset originator 1 43218 Integer ROW Hydrologic model grid row number, starting in the north and increasing to the south dataset originator 1 441 rows COLUMN_ Hydrologic model grid column number, starting on westside and increasing to the east. dataset originator 1 98 columns ptop_alt_f Perforations, Top Layer, Altitude in Feet dataset originator -1611.9301 3194.6101 feet .0001 pbot_alt_f Perforations, Bottom Layer, Altitude in Feet dataset originator -3412.4399 2427.3601 feet .0001 ptop_lay CVHM model layer in which the top of the virtual-well perforation is completed dataset originator 0 10 CVHM model layers 1 pbot_lay CVHM model layer in which the bottom of the virtual-well perforation is completed dataset originator 0 10 CVHM model layers 1 U.S. Geological Survey Michael Ierardi IT Specialist mailing and physical

445 National Center

Reston Virginia 20192 USA 1-888-275-8747 (1-888-ASK-USGS) mierardi@usgs.gov 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 upzip 5.605 https://water.usgs.gov/GIS/dsdl/pp1766_virtual_well_perforations.zip None. This dataset is provided by the USGS as a public service. 2011 20201117 U.S. Geological Survey Michael Ierardi IT Specialist mailing and physical address

445 National Center

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