Digital data sets that describe aquifer characteristics of the Enid isolated terrace aquifer in northwestern Oklahoma

This data set consists of digitized polygons of constant
hydraulic conductivity values for the Enid isolated terrace
aquifer in northwestern Oklahoma. The Enid isolated terrace
aquifer covers approximately 82 square miles and supplies water
for irrigation, domestic, municipal, and industrial use for the
City of Enid and western Garfield County. The Quaternary-age
Enid isolated terrace aquifer is composed of terrace deposits
that consist of discontinuous layers of clay, sandy clay, sand,
and gravel. The aquifer is unconfined and is bounded by the
underlying Permian-age Hennessey Group on the east and the Cedar
Hills Sandstone Formation of the Permian-age El Reno Group on
the west. Cedar Hills Sandstone Formation fills a channel
beneath the thickest section of the Enid isolated terrace
aquifer in the midwestern part of the aquifer.
The hydraulic conductivity polygons from a ground-water modeling
thesis and report were transferred to a map and digitized. The
map digitized was published at a scale of 1:62,500. Hydraulic
conductivities reported in the ground-water modeling thesis and
report for the Enid isolated terrace aquifer are 93.6 feet per
day and 134 feet per day.
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.

本数据集包含美国俄克拉荷马州西北部恩迪德孤立阶地含水层的恒定导水率（hydraulic conductivity）值数字化多边形。
恩迪德孤立阶地含水层总面积约82平方英里，为恩迪德市及加菲尔德县西部地区提供灌溉、生活、市政及工业用水。该第四纪（Quaternary）恩迪德孤立阶地含水层由阶地沉积构成，其沉积物包含不连续的黏土、砂质黏土、砂及砾石层。该含水层为无压含水层，东部以伏于其下的二叠纪（Permian）亨内西组（Hennessey Group）为界，西部则以二叠纪埃尔里诺群（El Reno Group）中的锡达希尔砂岩组（Cedar Hills Sandstone Formation）为界。锡达希尔砂岩组充填了位于含水层中西部区域的恩迪德孤立阶地含水层最厚段下方的古河道。
本数据集所采用的导水率多边形源自某地下水模拟学位论文及报告，经矢量化处理后绘制于地图之上。该矢量化地图的出版比例尺为1:62500。该地下水模拟学位论文及报告中给出的恩迪德孤立阶地含水层导水率值分别为93.6英尺/天及134英尺/天。
地下水流模型是对自然系统进行简化与聚合的数值表征手段。模型并非唯一解：含水层特征的不同组合均可生成相似的模拟结果。因此，本数据集所采用并展示的导水率值并非精确值，但与独立采集的实测数据相比，其处于合理区间范围内。