Faunt, Claudia C. 2012 tabular digital data Reston, Virginia U.S. Geological Survey http://water.usgs.gov/lookup/getspatial?pp1766_texture_class_coarse_fine Faunt, Claudia C. (editor) 2009 Professional Paper 1766 Reston, VA U.S. Geological Survey http://pubs.usgs.gov/pp/1766/PP_1766.pdf This digital dataset contains the categories used to classify the basin-fill deposits in the Central Valley as either coarse-grained or fine-grained deposits. This classification was used to develop the texture model which was used as input data for the hydraulic properties portion of 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). In order to better characterize the aquifer-system deposits, lithologic data from approximately 8,500 well-driller logs of boreholes ranging in depth from 12 to 3,000 feet below land surface were compiled and analyzed. The percentage of coarse-grained sediment, or texture, then was computed from this classification for each 50-foot depth interval of the logs. A 3D texture model was developed by interpolating the percentage of coarse-grained deposits onto a 1-mile spatial grid at 50-foot depth intervals from land surface to 2,800 feet below land surface. 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 categories used to classify the basin-fill deposits in the Central Valley as either coarse-grained or fine-grained deposits were used to build the texture model which was used as input to MODFLOW-FMP, the USGS 3D finite-difference code used to simulate flow in 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 categories used to classify the basin-fill deposits in the Central Valley as either coarse-grained or fine-grained deposits 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. 2099 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 model groundwater deposit none Groundwater Availability of the Central Valley Aquifer Central Valley Aquifer Central Valley Hydrologic Model Flow Model CVHM Texture Model CV-RASA coarse-grained fine-grained 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 US Geological Survey Hydrologist mailing and physical address

4165 Spruance Road, Suite 200

San Diego CA 92101 USA 619.225.6142 ccfaunt@usgs.gov http://water.usgs.gov/GIS/browse/pp1766_texture_class_coarse_fine_data.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 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 were checked and evaluated as part of the review process associated with the publication of the source report. Tabular, non-spatial dataset. Categories were determined by the dataset originator, who transcribed them into this table. The dataset is complete and is not anticipated to change. 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) basin-fill deposit categories and definitions In order to better characterize the aquifer-system deposits, lithologic data from approximately 8,500 well-driller logs of boreholes ranging in depth from 12 to 3,000 feet below land surface were compiled and analyzed. The percentage of coarse-grained sediment, or texture, then was computed from this classification for each 50-foot depth interval of the logs. A 3D texture model was developed by interpolating the percentage of coarse-grained deposits onto a 1-mile spatial grid at 50-foot depth intervals from land surface to 2,800 feet below land surface. Faunt(2009) 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 Texture Classification categories used to classify the basin-fill deposits Claudia C. Faunt Texture Type of basin-fill deposit texture (ash, boulders, clay, cobbles, conglomerate, gravel, hard pan, laminated, lava, lime, loam, mud, peat, pebbles, rock, sand, sandstone, shale, silt, siltstone, top soil, wood) dataset originator Ash Not applicable dataset originator Boulders coarse-grained deposits dataset originator Clay fine-grained deposits dataset originator Cobbles coarse-grained deposits dataset originator Conglomerate coarse-grained deposits dataset originator Gravel coarse-grained deposits dataset originator Hard Pan fine-grained deposits dataset originator Laminated fine-grained deposits dataset originator Lava Not applicable dataset originator Lime fine-grained deposits dataset originator Loam fine-grained deposits dataset originator Mud fine-grained deposits dataset originator Peat fine-grained deposits dataset originator Pebbles coarse-grained deposits dataset originator Rock Not applicable dataset originator Sand coarse-grained deposits dataset originator Sandstone coarse-grained deposits dataset originator Shale fine-grained deposits dataset originator Silt fine-grained deposits dataset originator Siltstone fine-grained deposits dataset originator Top Soil Not applicable dataset originator Wood Not applicable dataset originator Classification Indicates if basin-fill deposit is classified as either fine-grained or coarse-grained dataset originator Coarse high resistivity sediment, consisting of sand, gravel, pebbles, boulders, cobbles, or conglomerate dataset originator Fine low resistivity sediment, consisting principally of clay, lime, loam, mud, or silt dataset originator Not Applicable This basin-fill deposit did not calculate into the model and/or was not present in the study area dataset originator This digital dataset contains the categories used to classify the basin-fill deposits in the Central Valley as either coarse-grained or fine-grained deposits. This classification was used to develop the texture model which was used as input data for the hydraulic properties portion of the Central Valley Hydrologic Model (CVHM). 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. XLS Microsoft Excel 2007 upzip 5.605 http://water.usgs.gov/GIS/dsdl/pp1766_texture_class_coarse_fine.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_texture_class_coarse_fine FGDC Content Standards for Digital Geospatial Metadata FGDC-STD-001-1998