{"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 so \nthat the upper layer had different water transmitting and storage characteristics than the lower layer. \nTexture descriptions were used in most cases to identify the depth in a test-hole, water well, or \nsurface-geophysical log at which dividing the aquifer produced contrasting texture characteristics \nfor the upper and lower model layers. The study area covers approximately 30,000 square miles, \nand extends from the Niobrara River in the north to the Platte River in the south. The western \nboundary roughly coincides with the western boundary of the Upper Loup NRD, and the eastern \nboundary roughly coincides with the approximate location of the westernmost extent of glacial till \nin eastern Nebraska (University of Nebraska, 2005). This data release consists of a line shapefile \nof contours attributed with values representing the elevation of the base of the upper layer of the \ntwo-layer phase-three ELM above the vertical datum (National Geodetic Vertical Datum of 1929).", "distribution": [{"@type": "dcat:Distribution", "accessURL": "https://doi.org/10.5066/P9P0RJOB", "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.57b942b1-ea27-4e29-b2c3-027016a173ab.xml", "format": "XML", "mediaType": "text/xml", "title": "Original Metadata"}], "identifier": "http://datainventory.doi.gov/id/dataset/USGS_57b942b1-ea27-4e29-b2c3-027016a173ab", "keyword": ["Aquifer characteristics", "Elkhorn-Loup Model area", "Geohydrologic units", "High Plains aquifer", "Ogallala Aquifer", "USGS", "USGS:57b942b1-ea27-4e29-b2c3-027016a173ab", "aquifer base", "elevation", "geoscientificInformation", "inlandWaters"], "modified": "2020-11-17T00:00:00Z", "publisher": {"@type": "org:Organization", "name": "U.S. Geological Survey"}, "spatial": "-102.127979, 40.602907, -97.278278, 42.922146", "theme": ["geospatial"], "title": "Digital map of the elevation of base of the upper layer of the phase-three Elkhorn-Loup Model, north-central Nebraska"}