{"accessLevel": "public", "bureauCode": ["010:12"], "contactPoint": {"@type": "vcard:Contact", "fn": "Claudia C. Faunt", "hasEmail": "mailto:ccfaunt@usgs.gov"}, "description": "This digital dataset defines the well locations for hydraulic-head observations used in the calibration of the transient \nhydrologic model of the Central Valley flow system. The Central Valley encompasses an approximate 50,000 \nsquare-kilometer region of California. The complex hydrologic system of the Central Valley is simulated using \nthe USGSs numerical modeling code MODFLOW-FMP (Schmid and others, 2006).  This application is referred \nto here as the Central Valley Hydrologic Model (CVHM) (Faunt, 2009). Utilizing MODFLOW-FMP, the CVHM \nsimulates groundwater and surface-water flow, irrigated agriculture, land subsidence, and other key processes \nin the Central Valley on a monthly basis from 1961-2003.  The USGS and DWR maintain databases of key wells \nin the Central Valley that are web-accessible (http://waterdata.usgs.gov and http://www.water.ca.gov/waterdatalibrary/, \nrespectively). These data were combined to form a database of available water levels throughout the Central Valley \nfrom 1961 to 2003. More than 850,000 water-level altitude measurements from more than 21,400 wells have been \ncompiled by the USGS or DWR and have been entered into their respective databases. However, only a small \nproportion of these wells have both sufficient construction information to determine the well-perforation interval and \nwater-level measurements for the simulation period. For model calibration, water-level altitude data were needed \nthat were (1) distributed spatially (both geographically and vertically) throughout the Central Valley, from the \nvalley trough to the foothills; (2) distributed temporally throughout the simulation period (1961-2003); and (3) \navailable during both wet and dry climatic regimes. From the available wells records, a subset of comparison \nwells was selected on the basis of perforation depths, completeness of record, climatic intervals, and locations \nthroughout the Central Valley. Water-level altitude observations (19,725) for 206 comparison wells were used as \ncalibration targets during parameter estimation.  The CVHM is the most recent regional-scale model of the Central \nValley developed by the U.S. Geological Survey (USGS).The CVHM was developed as part of the USGS Groundwater \nResources Program (see \"Foreword\", Chapter A, page iii, for details).", "distribution": [{"@type": "dcat:Distribution", "accessURL": "https://doi.org/10.5066/P94SMIL7", "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.8ea73d62-5202-4445-93c7-8c1464b9f472.xml", "format": "XML", "mediaType": "text/xml", "title": "Original Metadata"}], "identifier": "http://datainventory.doi.gov/id/dataset/USGS_8ea73d62-5202-4445-93c7-8c1464b9f472", "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:8ea73d62-5202-4445-93c7-8c1464b9f472", "Ventura County", "Yolo County", "Yuba County", "geoscientificinformation", "groundwater", "hydraulic head", "hydrogeology", "hydrology", "inlandWaters", "model", "water level"], "modified": "2020-11-17T00:00:00Z", "publisher": {"@type": "org:Organization", "name": "U.S. Geological Survey"}, "spatial": "-122.429470, 35.021853, -118.778823, 40.390176", "theme": ["geospatial"], "title": "Locations of hydraulic-head observations (HOBS) for the Central Valley Hydrologic Model (CVHM)"}