{"accessLevel": "public", "bureauCode": ["010:12"], "contactPoint": {"@type": "vcard:Contact", "fn": "Jennifer S. Stanton", "hasEmail": "mailto:jstanton@usgs.gov"}, "description": "In 2006, a cooperative study was established to compile reliable data describing groundwater \nand surface-water interactions in the Elkhorn and Loup River Basins. The purpose of the study \nwas to address state legislation that requires a sustainable balance between long term water \nsupplies and uses of surface water and groundwater. A groundwater-flow model [hereinafter \nreferred to as the Elkhorn-Loup Model (ELM)] was constructed as part of the first two phases \nof that study as a tool for understanding the effect of groundwater pumpage on stream base \nflow and the effects of management strategies on hydrologically connected groundwater and \nsurface-water supplies. The third phase of the study was implemented to gain additional geologic \nknowledge and update the ELM with enhanced water-budget information and refined discretization \nof the model grid and stress periods. As part of that effort, the ELM is being reconstructed to \ninclude two vertical model layers, whereas phase-one and phase-two simulations (Peterson and \nothers, 2008; Stanton and others, 2010) represented the aquifer system using one vertical model \nlayer. The goal for defining the base of the upper model layer was to divide the model vertically \nso that the upper layer could have different water transmitting and storage characteristics than \nthe lower layer. Texture descriptions were used in most cases to identify the depth in a test-hole, \nwater-well, or surface-geophysical log at which dividing the aquifer produced contrasting texture \ncharacteristics for the upper and lower model layers. The study area covers approximately 30,000 \nsquare miles, and extends from the Niobrara River in the north to the Platte River in the south. \nThe western boundary roughly coincides with the western boundary of the Upper Loup NRD, and \nthe eastern boundary roughly coincides with the approximate location of the westernmost extent \nof glacial till in eastern Nebraska (University of Nebraska, 2005). This data release consists of a \npoint shapefile attributed with values representing the elevation of the base of the upper layer of \nthe two-layer phase-three Elkhorn-Loup Model (ELM) above the vertical datum (National Geodetic \nVertical Datum of 1929).", "distribution": [{"@type": "dcat:Distribution", "accessURL": "https://doi.org/10.5066/P901XBWQ", "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.f4935b5f-d254-42c4-a895-4a5e38421670.xml", "format": "XML", "mediaType": "text/xml", "title": "Original Metadata"}], "identifier": "http://datainventory.doi.gov/id/dataset/USGS_f4935b5f-d254-42c4-a895-4a5e38421670", "keyword": ["Aquifer characteristics", "Elkhorn-Loup model", "Geohydrologic units", "High Plains aquifer", "Ogalalla aquifer", "USGS", "USGS:f4935b5f-d254-42c4-a895-4a5e38421670", "aquifer base", "geoscientificInformation", "inlandWaters"], "modified": "2020-11-17T00:00:00Z", "publisher": {"@type": "org:Organization", "name": "U.S. Geological Survey"}, "spatial": "-102.109207, 40.601696, -97.291242, 42.904199", "theme": ["geospatial"], "title": "Digital map of test-hole, registered-water well, and surface-geophysical log sites used to estimate elevation of base of the upper layer of the phase-three Elkhorn-Loup Model, north-central Nebraska"}