{"accessLevel": "public", "bureauCode": ["010:12"], "contactPoint": {"@type": "vcard:Contact", "fn": "Nebraska Water Science Center", "hasEmail": "mailto:dc_ne@usgs.gov"}, "description": "The U.S. Geological Survey (USGS), in cooperation with the Lewis and Clark Natural Resources District \n(NRD), Lower Elkhorn NRD, Lower Loup NRD, Lower Platte North NRD, Lower Niobrara NRD, Middle \nNiobrara NRD, Upper Elkhorn NRD, and Upper Loup NRD, have agreed to cooperatively study water \nresources from prior to the beginning of irrigation development to 2005 in the Elkhorn-Loup Model \n(ELM) area using a ground-water-flow model.  The ELM area covers approximately 30,800 square \nmiles, and extends from the Niobrara River in the north to the Platte River in the south.  The western \nboundary of the ELM area coincides with the western boundary of the Middle Niobrara, Twin Platte, \nand Upper Loup NRDs; the eastern boundary coincides with the approximate location of the \nwesternmost extent of glacial till in eastern Nebraska. The initial ground-water-flow model was \nconstructed with a single layer vertically to represent the aquifers of the Tertiary-age Ogallala \nGroup and Quaternary-age alluvial deposits, with a uniform node spacing of 2 miles. The model will \nbe calibrated to measured ground-water levels and estimated ground-water discharge to streams for \nthe pre-ground-water development period (approximately 1940) and the simulation of the 1940-2005 \nperiod will be calibrated to measure ground-water level changes. The study results will assist Nebraska \nDepartment of Natural Resources and the NRDs in the ELM area to develop long-term strategies for \nmanaging hydrologically connected waters.\n\t\t\t\nThis dataset is one of three geospatial datasets that together revise previously published maps of the \nconfiguration of the base of the principal aquifer and of the geologic units that form the base of the \nprincipal aquifer in the study area; the revisions to the base-of-aquifer altitude are based on currently \navailable or reinterpreted geologic logs of test holes and selected registered wells. The principal aquifer \nis the High Plains aquifer except in the northeast part of the model area, where the principal aquifer is \nan unnamed alluvial aquifer.\n\t\t\t \nThis dataset consists of contour lines of the base-of-aquifer altitude above the vertical datum (National \nGeodetic Vertical Datum of 1929). The purpose of this dataset is to serve as the lower aquifer boundary \nin the ground-water-flow model of the Elkhorn-Loup Model area, north-central Nebraska. This dataset is \nnot intended to be used at scales larger than 1:350,000.\n\t\t\t \nThe density of registered wells and test holes with data about the depth to the base of aquifer varies \ngreatly across the map area. The accuracy of the base-of-aquifer contours in a given area is related \ndirectly to the density distribution and availability of registered well and test-hole data with information \nabout the depth to the base of aquifer in that area.", "distribution": [{"@type": "dcat:Distribution", "accessURL": "https://doi.org/10.5066/P9BUER94", "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.6d4df13e-660f-4a54-bba6-19028ac9e3d7.xml", "format": "XML", "mediaType": "text/xml", "title": "Original Metadata"}], "identifier": "http://datainventory.doi.gov/id/dataset/USGS_6d4df13e-660f-4a54-bba6-19028ac9e3d7", "keyword": ["Aquifer characteristics", "Brule Formation", "Chadron Formation", "Elkhorn-Loup Model Area", "Geohydrologic units", "High Plains aquifer", "Lower Tertiary", "Niobrara Formation", "Ogallala aquifer", "Pierre Shale", "USGS:6d4df13e-660f-4a54-bba6-19028ac9e3d7", "Upper Cretaceous", "White River Group", "aquifer base", "geoscientificInformation", "inlandWaters"], "modified": "2020-11-17T00:00:00Z", "publisher": {"@type": "org:Organization", "name": "U.S. Geological Survey"}, "spatial": "-102.127551, 40.599343, -97.275007, 42.924407", "theme": ["geospatial"], "title": "Digital map of the configuration of the base of the principal aquifer in the Elkhorn-Loup Model area, north-central Nebraska"}