{"accessLevel": "public", "bureauCode": ["010:12"], "contactPoint": {"@type": "vcard:Contact", "fn": "Robert Swanson", "hasEmail": "mailto:rswanson@usgs.gov"}, "description": "The U.S. Geological Survey, in cooperation with The Central Nebraska Public Power and \nIrrigation District (CNPPD), conducted a study that used bathymetric and topographic \nsurveying in conjunction with Geographical Information Systems techniques to determine\nthe 2003 physical shape and storage capacity, as well as the change in storage capacity \nof Lake McConaughy that occurred over 62 years. By combining the bathymetric and \ntopographic survey data, the 2003 surface area of Lake McConaughy was determined to \nbe 30,413.0 acres, with a volume of 1,756,300 acre-feet at the lake conservation-pool \nelevation of 3,266.4 feet above North American Vertical Datum of 1988 (3,265.0 feet above \nCNPPD datum). To determine the changes in storage of Lake McConaughy, the 2003 \nsurvey Digital Elevation Model (DEM) was compared to a preconstruction DEM compiled \nfrom historical contour maps. This comparison showed an increase in elevation at the dam \nsite due to the installation of Kingsley Dam. Immediately to the west of the Kingsley Dam \nis an area of decline where a borrow pit for Kingsley Dam was excavated. The comparison \nof the preconstruction survey to the 2003 survey also was used to estimate the gross storage \ncapacity reduction that occurred between 1941 and 2002. The results of this comparison \nindicate a gross storage capacity reduction of approximately 42,372 acre-feet, at the lake \nconservation-pool elevation of 3,266.4 feet in NAVD 88 (3,265.0 feet in CNPPD datum). By \ncomparing preconstruction and 2003 survey data and subtracting the Kingsley Dam and \nborrow pit, the total estimated net volume of sediment deposited from 1941 to 2003 was \n53,347,124 cubic yards, at an annual average rate of 860,437 cubic yards per year. The \napproximate decrease in the net storage capacity from 1941 to 2003 was 33,066 acre-feet, \nat an annual average decrease of approximately 533 acre-feet per year, which resulted in \na 1.8 percent decrease in storage capacity of Lake McConaughy. The lake accumulated \nmost of the sediment in the original river channel and in the west end of the delta area \non the upstream end of the lake.", "distribution": [{"@type": "dcat:Distribution", "accessURL": "https://doi.org/10.5066/P9BK51VI", "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.5ac47c98-0c17-479d-9b9f-3239c80edde5.xml", "format": "XML", "mediaType": "text/xml", "title": "Original Metadata"}], "identifier": "http://datainventory.doi.gov/id/dataset/USGS_5ac47c98-0c17-479d-9b9f-3239c80edde5", "keyword": ["Keith County", "Lake McConaughy", "Nebraska", "USGS:5ac47c98-0c17-479d-9b9f-3239c80edde5", "geoscientificInformation", "hydrographic survey", "inlandWaters", "topography"], "modified": "2020-11-17T00:00:00Z", "publisher": {"@type": "org:Organization", "name": "U.S. Geological Survey"}, "spatial": "-102.023150, 41.191345, -101.665499, 41.311398", "theme": ["geospatial"], "title": "Elevation contour lines for Lake McConaughy, Nebraska"}