{"accessLevel": "public", "bureauCode": ["010:12"], "contactPoint": {"@type": "vcard:Contact", "fn": "Claudia C. Faunt", "hasEmail": "mailto:ccfaunt@usgs.gov"}, "description": "This digital dataset defines the thickness of the Corcoran Clay Member of the Tulare Formation. The complex \nhydrologic system of the Central Valley is simulated using the USGS numerical modeling code MODFLOW-FMP \n(Schmid and others, 2006b).  This simulation is referred to here as the Central Valley Hydrologic Model (CVHM) \n(Faunt, 2009). Utilizing MODFLOW-FMP, the CVHM simulates groundwater and surface-water flow, irrigated \nagriculture, land subsidence, and other key processes in the Central Valley on a monthly basis from 1961-2003.  \nNumerous lenses of fine-grained sediments are distributed throughout the southern Central Valley (San Joaquin \nValley) and generally constitute more than 50 percent of the total thickness of the valley fill. Generally, these \nlenses are discontinuous and not vertically extensive or laterally continuous. However, the Corcoran Clay is a \nlow-permeability, areally extensive, lacustrine deposit (Johnson and others, 1968) as much as 200 feet thick \n(Davis and others, 1959; Page, 1986). This continuous clay divides the groundwater-flow system of the western \nSan Joaquin Valley into an upper semi-confined zone and a lower confined zone (Williamson and others, 1989; \nBelitz and Heimes, 1990; Burow and others, 2004).  The extent and distribution of the Corcoran Clay was defined \nfor use in the CVHM because the unit is one of the few deposits in the Valley that can be regionally mapped. \nThe CVHM is the most recent regional-scale model of the Central Valley developed by the U.S. Geological \nSurvey (USGS).  The CVHM was developed as part of the USGS Groundwater Resources Program (see \n\"Foreword\", Chapter A, page iii, for details).", "distribution": [{"@type": "dcat:Distribution", "accessURL": "https://doi.org/10.5066/P9O6FJ24", "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.2f8bbf23-c3d4-486d-a11e-a4725d80334a.xml", "format": "XML", "mediaType": "text/xml", "title": "Original Metadata"}], "identifier": "http://datainventory.doi.gov/id/dataset/USGS_2f8bbf23-c3d4-486d-a11e-a4725d80334a", "keyword": ["CV-RASA", "California", "Central Valley", "Central Valley Aquifer", "Central Valley Hydrologic Model", "Corcoran Clay", "Flow Model CVHM", "Fresno County", "Groundwater Availability of the Central Valley Aquifer", "Kern County", "Kings County", "Madera County", "Merced County", "San Joaquin County", "Stanislaus County", "Texture Model", "Tulare County", "USGS:2f8bbf23-c3d4-486d-a11e-a4725d80334a", "geoscientificinformation", "groundwater", "hydrogeology", "hydrology", "inlandWaters", "model"], "modified": "2020-11-17T00:00:00Z", "publisher": {"@type": "org:Organization", "name": "U.S. Geological Survey"}, "spatial": "-121.520515, 35.009307, -118.787359, 37.814874", "theme": ["geospatial"], "title": "Contours of Corcoran Clay Thickness in feet by Page (1986) for the Central Valley Hydrologic Model (CVHM)"}