{"accessLevel": "public", "bureauCode": ["010:12"], "contactPoint": {"@type": "vcard:Contact", "fn": "Carol J. Becker", "hasEmail": "mailto:cjbecker@usgs.gov"}, "description": "This data set consists of digital polygons of constant recharge\nrates for the High Plains aquifer in Oklahoma. This area\nencompasses the panhandle counties of Cimarron, Texas, and\nBeaver, and the western counties of Harper, Ellis, Woodward,\nDewey, and Roger Mills. The High Plains aquifer underlies\napproximately 7,000 square miles of Oklahoma and is used\nextensively for irrigation. The High Plains aquifer is a\nwater-table aquifer and consists predominately of the\nTertiary-age Ogallala Formation and overlying Quaternary-age\nalluvial and terrace deposits. In some areas the aquifer is\nabsent and the underlying Triassic, Jurassic, or Cretaceous-age\nrocks are exposed at the surface. These rocks are hydraulically\nconnected with the aquifer in some areas.\nThe High Plains aquifer is composed of interbedded sand,\nsiltstone, clay, gravel, thin limestones, and caliche. The\nproportion of various lithological materials changes rapidly\nfrom place to place, but poorly sorted sand and gravel\npredominate. The rocks are poorly to moderately well cemented by\ncalcium carbonate.\nThe High Plains aquifer was divided into an east and west half\nwith each half having an assigned recharge that was used as\ninput to a ground-water flow model on the High Plains aquifer,\nduring the calibration of the steady-state model. The east half was\nassigned a constant recharge value of 0.45 inches per year and the\nwest half 0.225 inches per year.\nThe polygon boundaries and constant recharge rates were\nconstructed by extracting lines from digital surficial geology\ndata sets based on a scale of 1:125,000 for the panhandle\ncounties and 1:250,000 for the western counties. Some of the\nlines were digitized from maps in a published water-level\nelevation map for 1980.\nGround-water flow models are numerical representations that\nsimplify and aggregate natural systems. Models are not unique;\ndifferent combinations of aquifer characteristics may produce\nsimilar results. Therefore, values of recharge used in the\nmodel and presented in this data set are not precise, but are\nwithin a reasonable range when compared to independently\ncollected data.", "distribution": [{"@type": "dcat:Distribution", "accessURL": "https://doi.org/10.5066/P9UJZY1B", "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.ae78c471-8f07-4b29-a170-633a5e02011e.xml", "format": "XML", "mediaType": "text/xml", "title": "Original Metadata"}], "identifier": "http://datainventory.doi.gov/id/dataset/USGS_ae78c471-8f07-4b29-a170-633a5e02011e", "keyword": ["High Plains aquifer", "Ogallala Formation", "Ogallala aquifer", "USGS:ae78c471-8f07-4b29-a170-633a5e02011e", "aquifers", "environment", "geoscientificInformation", "ground water", "ground-water recharge", "ground-water vulnerability", "groundwater", "groundwater vulnerability", "inlandWaters", "northwestern Oklahoma", "panhandle of Oklahoma", "recharge", "recharge rate", "western Oklahoma", "western counties in Oklahoma"], "modified": "2020-11-17T00:00:00Z", "publisher": {"@type": "org:Organization", "name": "U.S. Geological Survey"}, "spatial": "-102.8856, 35.2500, -99.2367, 37.1297", "theme": ["geospatial"], "title": "Digital data sets that describe aquifer characteristics of the High Plains aquifer in western Oklahoma"}