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  <dcat:Dataset rdf:about="http://catalog.data.gov/dataset/digital-data-sets-that-describe-aquifer-characteristics-of-the-elk-city-aquifer-in-western-okla13043">
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    <dct:description>This data set consists of digitized polygons of constant hydraulic conductivity values for the Elk City aquifer in western Oklahoma. The aquifer covers an area of approximately 193,000 acres and supplies ground water for irrigation, domestic, and industrial purposes in Beckham, Custer, Roger Mills, and Washita Counties along the divide between the Washita and Red River basins. The Elk City aquifer consists of the Elk City Sandstone and overlying terrace deposits, made up of clay, silt, sand and gravel, and dune sands in the eastern part and sand and gravel of the Ogallala Formation (or High Plains aquifer) in the western part of the aquifer. The Elk City aquifer is unconfined and composed of very friable sandstone, lightly cemented with clay, calcite, gypsum, or iron oxide. Most of the grains are fine-sized quartz but the grain size ranges from clay to cobble in the aquifer. The Doxey Shale underlies the Elk City aquifer and acts as a confining unit, restricting the downward movement of ground water. Values of hydraulic conductivity used as input to the ground-water flow model and in this data set are: 50 gallons per day per foot squared or 6.7 feet per day for the Elk City Sandstone; 500 gallons per day per foot squared or 66.8 feet per day for the Quaternary terrace deposits and dune sand; and 750 gallons per day per foot squared or 100.3 feet day for the Ogallala Formation. The hydraulic conductivity polygons from a ground-water modeling thesis were transferred to a photocopy of a paper map and digitized. The source map was published at a scale of 1:63,360. Ground-water flow models are numerical representations that simplify and aggregate natural systems. Models are not unique; different combinations of aquifer characteristics may produce similar results. Therefore, values of hydraulic conductivity used in the model and presented in this data set are not precise, but are within a reasonable range when compared to independently collected data.</dct:description>
        <dcat:keyword>permeability coefficent</dcat:keyword>
        <dcat:keyword>inlandwaters</dcat:keyword>
        <dcat:keyword>ground water</dcat:keyword>
        <dcat:keyword>western oklahoma</dcat:keyword>
        <dcat:keyword>elk city sandstone</dcat:keyword>
        <dcat:keyword>groundwater vulnerability</dcat:keyword>
        <dcat:keyword>elk city sandstone aquifer</dcat:keyword>
        <dcat:keyword>groundwater</dcat:keyword>
        <dcat:keyword>ground-water vulnerability</dcat:keyword>
        <dcat:keyword>elk city aquifer</dcat:keyword>
        <dcat:keyword>coefficent of permeability</dcat:keyword>
        <dcat:keyword>permeability</dcat:keyword>
        <dcat:keyword>hydraulic conductivity</dcat:keyword>
        <dcat:keyword>aquifers</dcat:keyword>
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    <dct:identifier>digital-data-sets-that-describe-aquifer-characteristics-of-the-elk-city-aquifer-in-western-okla13043</dct:identifier>
    <dct:title>Digital data sets that describe aquifer characteristics of the Elk City aquifer in western Oklahoma</dct:title>
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               <dct:title>Other</dct:title>
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               <dct:title>Web Page</dct:title>
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            <rdfs:label>bbox-east-long</rdfs:label>
            <rdf:value>-99.0740</rdf:value>
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            <rdf:value>http://water.usgs.gov/lookup/get?OFR96-449/browse.gif</rdf:value>
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        <dct:relation>
          <rdf:Description>
            <rdfs:label>bbox-south-lat</rdfs:label>
            <rdf:value>35.2192</rdf:value>
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        <dct:relation>
          <rdf:Description>
            <rdfs:label>spatial-reference-system</rdfs:label>
            <rdf:value></rdf:value>
          </rdf:Description>
        </dct:relation>
        <dct:relation>
          <rdf:Description>
            <rdfs:label>spatial_harvester</rdfs:label>
            <rdf:value>True</rdf:value>
          </rdf:Description>
        </dct:relation>
        <dct:relation>
          <rdf:Description>
            <rdfs:label>spatial</rdfs:label>
            <rdf:value>{"type": "Polygon", "coordinates": [[[-99.6799, 35.2192], [-99.074, 35.2192], [-99.074, 35.5458], [-99.6799, 35.5458], [-99.6799, 35.2192]]]}</rdf:value>
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            <rdfs:label>progress</rdfs:label>
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        <dct:relation>
          <rdf:Description>
            <rdfs:label>access_constraints</rdfs:label>
            <rdf:value>["Use Constraints: This data set was digitized from a photocopy of a map published at a scale of 1:63,360, and represents the hydraulic conductivity polygons as reported by Lyons (1981). Hydraulic conductivity polygons represented at this scale are indicative of broad, regional trends and should not be interpreted as site-specific. The hydraulic conductivity polygons were drawn onto and digitized from a plate size, 29 inches by 39 inches, paper material, with a maximum registration root-mean-squared error (RMSE) of 0.016 map inches (0.041 map centimeters) and 82 feet (25 meters) ground distance. Ground-water flow models are numerical representations that simplify and aggregate natural systems. Models are not unique; different combinations of aquifer characteristics may produce similar results. The hydraulic conductivity and recharge are closely interrelated. As long as these two model inputs are in balance the model has a small mean residual; it represents the natural system numerically. If the hydraulic conductivity is accurately known, the model can be used to accurately determine recharge. Likewise, if the hydraulic conductivity is poorly known, then the recharge will be poorly determined. Therefore, values of hydraulic conductivity used in the model and presented in this data set are not precise, but are within a reasonable range when compared to independently collected data. In most aquifers, hydraulic conductivity measurements made in wells or in cores will range over several orders of magnitude, even over short horizontal and vertical distances. Hydraulic conductivity values derived from ground-water flow models represent areal generalizations and do not reflect the large local variance in well or core measurements.", "Access Constraints: None."]</rdf:value>
          </rdf:Description>
        </dct:relation>
        <dct:relation>
          <rdf:Description>
            <rdfs:label>contact-email</rdfs:label>
            <rdf:value>cjbecker@usgs.gov</rdf:value>
          </rdf:Description>
        </dct:relation>
        <dct:relation>
          <rdf:Description>
            <rdfs:label>bbox-west-long</rdfs:label>
            <rdf:value>-99.6799</rdf:value>
          </rdf:Description>
        </dct:relation>
        <dct:relation>
          <rdf:Description>
            <rdfs:label>metadata-date</rdfs:label>
            <rdf:value>2004-11-08</rdf:value>
          </rdf:Description>
        </dct:relation>
        <dct:relation>
          <rdf:Description>
            <rdfs:label>dataset-reference-date</rdfs:label>
            <rdf:value>[{"type": "publication", "value": "1997-01-01"}]</rdf:value>
          </rdf:Description>
        </dct:relation>
        <dct:relation>
          <rdf:Description>
            <rdfs:label>graphic-preview-description</rdfs:label>
            <rdf:value>A browse image of the four aquifer data sets.</rdf:value>
          </rdf:Description>
        </dct:relation>
        <dct:relation>
          <rdf:Description>
            <rdfs:label>frequency-of-update</rdfs:label>
            <rdf:value>notPlanned</rdf:value>
          </rdf:Description>
        </dct:relation>
        <dct:relation>
          <rdf:Description>
            <rdfs:label>licence</rdfs:label>
            <rdf:value>["Although this data set has been used by the U.S. Geological\nSurvey, U.S. Department of the Interior, no warranty expressed or\nimplied is made by the U.S. Geological Survey as to the accuracy\nof the data and related materials. The act of distribution shall not \nconstitute any such warranty, and no responsibility is assumed by \nthe U.S. Geological Survey in the use of this data, software, or \nrelated materials.\n\nAny use of trade, product, or firm names is for descriptive\npurposes only and does not imply endorsement by the U.S.\nGovernment."]</rdf:value>
          </rdf:Description>
        </dct:relation>
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          <rdf:Description>
            <rdfs:label>metadata_type</rdfs:label>
            <rdf:value>geospatial</rdf:value>
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          <rdf:Description>
            <rdfs:label>responsible-party</rdfs:label>
            <rdf:value>[{"name": "U.S. Geological Survey", "roles": ["pointOfContact"]}]</rdf:value>
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            <rdfs:label>harvest_source_title</rdfs:label>
            <rdf:value>Water NSDI Node Spatial Datasets</rdf:value>
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