Digital data sets that describe aquifer characteristics of the Central Oklahoma aquifer in central Oklahoma

This data set consists of digitized polygons of a constant hydraulic conductivity value for the Central Oklahoma aquifer in central Oklahoma. This area encompasses all or part of Cleveland, Lincoln, Logan, Oklahoma, Payne, and Pottawatomie Counties. The Central Oklahoma aquifer includes the alluvial and terrace deposits along major streams, the Garber Sandstone and Wellington Formations, and the Chase, Council Grove, and Admire Groups. The Quaternary-age alluvial and terrace deposits consist of unconsolidated clay, silt, sand, and gravel. The hydraulic conductivity data set was created from digital data sets developed to produce a map for a previously published report. The hydraulic conductivity of the alluvial and terrace deposits are not included in this data set. This data set represents the hydraulic conductivities of only the sandstone units in the Garber Sandstone and Wellington Formations and the Chase, Council Grove, and Admire Groups. The median hydraulic conductivity of the sandstones in the Garber Sandstone and Wellington Formations and the Chase, Council Grove, and Admire Groups, calculated from specific capacity data, is 4.5 feet per day The contact between the Wellington Formation and the Chase, Council Grove, and Admire Groups was included in this data set because the median percentage of sandstone in the Chase, Council Grove, and Admire Groups is 43 percent of the median sandstone percentage of the Garber Sandstone and Wellington Formations. The hydraulic conductivity values for the other rock units, such as the siltstone, mudstone, shale, and limestone, in the Garber Sandstone and Wellington Formations and the Chase, Council Grove, and Admire Groups were not reported.本数据集包含俄克拉荷马州中部含水层（Central Oklahoma aquifer）的恒定导水率数字化多边形数据。该区域覆盖克利夫兰、林肯、洛根、俄克拉荷马、佩恩及波特瓦特米县的全部或部分辖区。俄克拉荷马州中部含水层涵盖主要河流沿岸的冲积与阶地沉积、加伯砂岩（Garber Sandstone）与惠灵顿组（Wellington Formation），以及蔡斯群（Chase Group）、考恩斯格罗夫群（Council Grove Group）与阿德米尔群（Admire Group）。第四纪冲积与阶地沉积由未固结的黏土、粉砂、砂及砾石组成。 本导水率数据集源自为编制已发表专题报告中的地图而开发的数字化数据集。本数据集未纳入冲积与阶地沉积的导水率数据，仅涵盖加伯砂岩、惠灵顿组以及蔡斯群、考恩斯格罗夫群与阿德米尔群中砂岩单元的导水率值。研究人员通过单位涌水量（specific capacity）数据计算得到上述砂岩的导水率中位数为4.5英尺/天。鉴于蔡斯群、考恩斯格罗夫群与阿德米尔群的砂岩占比中位数为加伯砂岩与惠灵顿组砂岩占比中位数的43%，本数据集纳入了惠灵顿组与上述三群之间的接触界面。本数据集未记录加伯砂岩、惠灵顿组以及蔡斯群、考恩斯格罗夫群与阿德米尔群中其他岩性单元（如粉砂岩、泥岩、页岩与石灰岩）的导水率值。