Digital data sets that describe aquifer characteristics of the alluvial and terrace deposits along the North Canadian River from Canton Lake to Lake Overholser in central Oklahoma

This data set consists of digital polygons of a constant recharge value for the alluvial and terrace deposits along the North Canadian River from Canton Lake to Lake Overholser in central Oklahoma. Ground water in approximately 400 square miles of Quaternary-age alluvial and terrace aquifer is an important source of water for irrigation, industrial, municipal, stock, and domestic supplies. The aquifer consists of clay, silt, sand, and gravel. Sand-sized sediments dominate the poorly sorted, fine to coarse, unconsolidated quartz grains in the aquifer. The hydraulically connected alluvial and terrace deposits unconformably overlie Permian-age formations. The aquifer is overlain by a layer of wind-blown sand in parts of the area. A uniform recharge rate of 1 inch per year was used as input to the ground-water flow model for the aquifer and is used in this data set. The features representing boundaries along geological contacts were extracted from published digital surficial geology data sets based on a scale of 1:250,000. The northwest and southeast geographic limits of the aquifer and were digitized from a folded paper map in a ground-water modeling report, at a scale of 1:250,000 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 recharge 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.本数据集包含俄克拉荷马州中部坎顿湖至奥弗霍尔泽湖段北加拿大河沿岸冲积与阶地沉积物的恒定补给值数字多边形。约400平方英里的第四纪冲积与阶地含水层（aquifer）中赋存的地下水，是灌溉、工业、市政、畜牧及生活供水的重要水源。该含水层由黏土、粉砂、砂及砾石组成，内部以分选较差、粒度跨度为细至粗的松散石英颗粒构成的砂级沉积物为主。水力连通的冲积与阶地沉积物不整合覆盖于二叠纪地层之上，该区域部分地段的含水层上方还覆盖有一层风成砂。 本数据集与该含水层地下水流动模型（ground-water flow model）均采用年补给速率1英寸作为输入参数。 代表地质接触边界的要素，从比例尺为1:250000的已公开数字地表地质数据集中提取得到。含水层的西北与东南地理边界，从比例尺为1:250000的地下水模拟报告中的折叠纸质地图数字化而来。 地下水流动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可能得到相似的模拟结果。因此，本模型中使用并收录于本数据集的补给值并非精确定值，但与独立采集的实测数据相比，处于合理区间内。