{"accessLevel": "public", "bureauCode": ["010:12"], "contactPoint": {"@type": "vcard:Contact", "fn": "Claudia C. Faunt", "hasEmail": "mailto:ccfaunt@usgs.gov"}, "description": "This digital dataset contains the compaction data for 24 extensometers used for observations \nin the Central Valley Hydrologic Model (CVHM).  The Central Valley encompasses an approximate \n50,000 square-kilometer region of California. The complex hydrologic system of the Central Valley \nis simulated using the USGS numerical modeling code MODFLOW-FMP (Schmid and others, 2006).  \nThis simulation is referred to here as the CVHM (Faunt, 2009). Utilizing MODFLOW-FMP, the CVHM \nsimulates groundwater and surface-water flow, irrigated agriculture, land subsidence, and other key \nprocesses in the Central Valley on a monthly basis from 1961-2003.  The total active modeled area \nis 20,334 square-miles.   Water levels, water-level altitude changes, and water-level and potentiometric-\nsurface altitude maps; streamflows; boundary flows; subsidence; groundwater pumpage; water use; \nand water-delivery observations were used to constrain parameter estimates throughout the calibration \nof the CVHM.  Measured compaction from extensometers placed in the valley was used as a subsidence \ncalibration target. The extensometer locations were obtained from USGS files and GPS locations. \nSubsidence monitoring observations can provide valuable information about hydrologic parameters \nsuch as elastic and inelastic skeletal specific storage. The CVHM was adjusted to fit the range of \nmeasured compaction at the extensometer sites utilizing UCODE-2005 (Poeter and others, 2006) \nand manual calibration. The calibration target was the measured compaction from several extensometers \nin the region. Compaction though delayed drainage and re-pressurizing of aquitards was not simulated. \nThe CVHM is the most recent regional-scale model of the Central Valley developed by the U.S. \nGeological Survey (USGS).  The CVHM was developed as part of the USGS Groundwater Resources \nProgram (see \"Foreword\", Chapter A, page iii, for details).", "distribution": [{"@type": "dcat:Distribution", "accessURL": "https://doi.org/10.5066/P9GZ7YNV", "description": "Landing page for access to the data", "format": "XML", "mediaType": "application/http", "title": "Digital Data"}, {"@type": "dcat:Distribution", "description": "The metadata original format", "downloadURL": "https://data.usgs.gov/datacatalog/metadata/USGS.8ad9e431-730e-4355-a230-dd8f83a97e94.xml", "format": "XML", "mediaType": "text/xml", "title": "Original Metadata"}], "identifier": "http://datainventory.doi.gov/id/dataset/USGS_8ad9e431-730e-4355-a230-dd8f83a97e94", "keyword": ["Alameda County", "Amador County", "Butte County", "CV-RASA", "Calaveras County", "California", "Central Valley", "Central Valley Aquifer", "Central Valley Hydrologic Model", "Central Valley, California", "Colusa County", "Contra Costa County", "El Dorado County", "Flow Model CVHM", "Fresno County", "Glenn County", "Groundwater Availability of the Central Valley Aquifer", "Humboldt County", "Kern County", "Kings County", "Lake County", "Madera County", "Mariposa County", "Mendocino County", "Merced County", "Monterey County", "Napa County", "Nevada County", "Placer County", "Sacramento County", "Sacramento Valley", "San Benito County", "San Joaquin County", "San Joaquin Valley", "San Luis Obispo County", "Santa Barbara County", "Santa Clara County", "Shasta County", "Solano County", "Sonoma County", "Stanislaus County", "Sutter County", "Tehama County", "Texture Model", "Trinity County", "Tulare County", "Tuolumne County", "USGS:8ad9e431-730e-4355-a230-dd8f83a97e94", "Ventura County", "Yolo County", "Yuba County", "extensometer", "geoscientificinformation", "groundwater", "hydrogeology", "hydrology", "inlandWaters", "model", "subsidence"], "modified": "2020-11-17T00:00:00Z", "publisher": {"@type": "org:Organization", "name": "U.S. Geological Survey"}, "spatial": "-123.831528, 34.519871, -117.916328, 40.748631", "theme": ["geospatial"], "title": "Measured compaction for 24 extensometers in the Central Valley"}