{"accessLevel": "public", "bureauCode": ["010:12"], "contactPoint": {"@type": "vcard:Contact", "fn": "Claudia C. Faunt", "hasEmail": "mailto:ccfaunt@usgs.gov"}, "description": "This digital dataset defines the depth of the Corcoran Clay Member of the Tulare Formation. \nThe complex hydrologic system of the Central Valley is simulated using the USGS numerical modeling code \nMODFLOW-FMP (Schmid and others, 2006b).  This simulation is referred to here as the Central Valley \nHydrologic Model (CVHM) (Faunt, 2009). Utilizing MODFLOW-FMP, the CVHM simulates groundwater and \nsurface-water flow, irrigated agriculture, land subsidence, and other key processes in the Central Valley on a \nmonthly basis from 1961-2003.  Numerous lenses of fine-grained sediments are distributed throughout the \nsouthern Central Valley (San Joaquin Valley) and generally constitute more than 50 percent of the total \nthickness of the valley fill. Generally, these lenses are discontinuous and not vertically extensive or laterally \ncontinuous. However, the Corcoran Clay is a low-permeability, areally extensive, lacustrine deposit (Johnson and \nothers, 1968) as much as 200-ft thick (Davis and others, 1959; Page, 1986). This continuous clay divides the \ngroundwater-flow system of the western San Joaquin Valley into an upper semi-confined zone and a lower \nconfined zone (Williamson and others, 1989; Belitz and Heimes, 1990; Burow and others, 2004).  The extent and \ndistribution of the Corcoran Clay was defined for use in the CVHM because the unit is one of the few deposits in \nthe Valley that can be regionally mapped. 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 \nGroundwater Resources Program (see \"Foreword\", Chapter A, page iii, for details).", "distribution": [{"@type": "dcat:Distribution", "accessURL": "https://doi.org/10.5066/P99CZ9W4", "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.2eedd7e1-0522-465f-9478-c47e5263a46e.xml", "format": "XML", "mediaType": "text/xml", "title": "Original Metadata"}], "identifier": "http://datainventory.doi.gov/id/dataset/USGS_2eedd7e1-0522-465f-9478-c47e5263a46e", "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:2eedd7e1-0522-465f-9478-c47e5263a46e", "discretization", "geoscientificinformation", "groundwater", "hydrogeology", "hydrology", "inlandWaters", "model"], "modified": "2020-11-17T00:00:00Z", "publisher": {"@type": "org:Organization", "name": "U.S. Geological Survey"}, "spatial": "-121.504203, 35.004248, -118.758069, 37.793811", "theme": ["geospatial"], "title": "Contours of Corcoran Clay Depth in feet from Page (1986) for the Central Valley Hydrologic Model (CVHM)"}