Faunt, Claudia C. 2012 tabular digital data Reston, Virginia U.S. Geological Survey http://water.usgs.gov/lookup/getspatial?subsidence_measured_data Faunt, Claudia C. (editor) 2009 Professional Paper 1766 Reston, Virginia U.S. Geological Survey 3 chapters, 1 appendix http://pubs.usgs.gov/pp/1766/PP_1766.pdf This digital dataset contains the compaction data for 24 extensometers used for observations in 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 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. Water levels, water-level altitude changes, and water-level and potentiometric-surface altitude maps; streamflows; boundary flows; subsidence; groundwater pumpage; water use; and water-delivery observations were used to constrain parameter estimates throughout the calibration of the CVHM. Measured compaction from extensometers placed in the valley was used as a subsidence calibration target. The extensometer locations were obtained from USGS files and GPS locations. Subsidence monitoring observations can provide valuable information about hydrologic parameters such as elastic and inelastic skeletal specific storage. The CVHM was adjusted to fit the range of measured compaction at the extensometer sites utilizing UCODE-2005 (Poeter and others, 2006) and manual calibration. The calibration target was the measured compaction from several extensometers in the region. Compaction though delayed drainage and re-pressurizing of aquitards was not simulated. 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 (see "Foreword", Chapter A, page iii, for details). The compaction observations dataset was used to calibrate MODFLOW-FMP, the USGS 3-dimensional finite-difference code used to simulate flow in the CVHM. The column heading can be related to a shape file of the locations of the extensometers. 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 compaction observations 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. 2008 2009 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 extensometer subsidence none Groundwater Availability of the Central Valley Aquifer Central Valley Aquifer Central Valley Hydrologic Model Texture Model Flow Model CVHM CV-RASA 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

4165 Spruance Road, Suite 200

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/pp1766_subsidence.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 Cente http://pubs.usgs.gov/tm/2006/tm6A17/ Poeter, Eileen E. Hill, Mary C. Banta, Edward R. Mehl, Steffen Christensen, Steen 2006 Techniques and Methods 6-A11 Reston, VA U.S. Geological Survey http://pubs.usgs.gov/tm/2006/tm6a11/ Extensometer records were transcribed into a digital format. Logical consistency checks were conducted during preparation of the dataset by visual examination of the data values and graphed to look for spurious values. The features in this dataset represents land subsidence measurements over a 25-year period in the Central Valley, used in the formation of the Central Valley Hydrologic Model. The dataset is complete and is not anticipated to change. Written extensometer records were transcribed and tabulated into a digital format. Attributes were added to allow a relation to be established with a point-location dataset. 2005 compaction data amount of compaction for the given time period metadata author DATE-TIME Calendar month, day, and year represented in date format (MM/DD/YYYY) dataset originator 2/26/1958 1/3/1983 Calendar Day, Month, and Year (MM/DD/YYYY) 196104 (April, 1961) 200309 (September, 2003) 012S012E16H002M Subsidence values at well 012S012E16H002M dataset originator 0 1.035 meters .000001 012S012E16H003M Subsidence values at well 012S012E16H003M dataset originator 0 0.108 meters .000001 013S015E35D005M Subsidence values at well 013S015E35D005M dataset originator -0.039 0.141 meters .000001 014S012E12H001M Subsidence values at well 014S012E12H001M dataset originator 0 0.724 meters .000001 014S013E11D006M Subsidence values at well 014S013E11D006M dataset originator 0 1.437 meters .000001 015S013E11D002M Subsidence values at well 015S013E11D002M dataset originator 0 0.286 meters .000001 015S016E31N003M Subsidence values at well 015S016E31N003M dataset originator 0 0.194 meters .000001 022S027E30D002M Subsidence values at well 022S027E30D002M dataset originator -0.012 0.408 meters .000001 023S025E16N003M Subsidence values at well 023S025E16N003M dataset originator 0 0.324 meters .000001 023S025E16N004M Subsidence values at well 023S025E16N004M dataset originator 0 0.037 meters .000001 023S027E16N001M Subsidence values at well 023S027E16N001M dataset originator 0 1.450 meters .000001 024S026E34F001M Subsidence values at well 024S026E34F001M dataset originator -0.024 0.254 meters .000001 024S026E36A002M Subsidence values at well 024S026E36A002M dataset originator 0 0.674 meters .000001 026S023E16H002M Subsidence values at well 026S023E16H002M dataset originator -0.033 0.041 meters .000001 026S023E16H003M Subsidence values at well 026S023E16H003M dataset originator -0.011 0.005 meters .000001 011N001E24Q008M Subsidence values at well 011N001E24Q008M dataset originator -0.234 0.027 meters .000001 013S015E31J003M4 Subsidence values at well 013S015E31J003M4 dataset originator -0.005 0.009 meters .000001 016S015E34N001M2 Subsidence values at well 016S015E34N001M2 dataset originator -0.216 0.040 meters .000001 017S015E14Q001M2 Subsidence values at well 017S015E14Q001M2 dataset originator -0.262 0.037 meters .000001 018S016E33A001M2 Subsidence values at well 018S016E33A001M2 dataset originator -0.433 0.037 meters .000001 020S018E06D001M2 Subsidence values at well 020S018E06D001M2 dataset originator -0.098 0.009 meters .000001 018S019E20P002S3 Subsidence values at well 018S019E20P002S3 dataset originator -0.013 0.173 meters .000001 025S026E01A002S3 Subsidence values at well 025S026E01A002S3 dataset originator -0.003 0.664 meters .000001 032S028E20Q001M3 Subsidence values at well 032S028E20Q001M3 dataset originator -0.005 0.657 meters .000001 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 tabular dataset for the measured compaction for 24 extensometers as part of the Central Valley Hydrologic Model. 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 0.033 http://water.usgs.gov/GIS/dsdl/pp1766_subsidence.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_subsidence_meausred_data FGDC Content Standards for Digital Geospatial Metadata FGDC-STD-001-1998