GroMoPo Metadata for Madison Group, Powder River Basin USGS model

A digital simulation model was used to analyze regional ground-water flow in the Madison Group aquifer in the Powder River Basin in Montana and Wyoming and adjacent areas. Most recharge to the aquifer originates in or near the outcrop areas of the Madison in the Bighorn Mountains and Black Hills, and most discharge occurs through springs and wells. Flow through the aquifer in the modeled areas was approximately 200 cubic feet per second. The aquifer can probably sustain increased ground-water withdrawals of up to several tens of cubic feet per second, but these withdrawals probably would significantly lower the potentiometric surface in the Madison aquifer in a large part of the basin. (Woodard-USGS)本研究借助数值模拟模型，对蒙大拿州与怀俄明州粉河盆地及毗邻区域内的麦迪逊群含水层（Madison Group aquifer）的区域地下水流场进行了分析。该含水层的主要补给来源为比格霍恩山脉与布莱克希尔斯区域内麦迪逊群的露头区及其邻近地带，而主要排泄则通过泉眼与水井实现。模拟区域内含水层的地下径流总量约为200立方英尺每秒。该含水层或可承受最高达数十立方英尺每秒的新增地下水开采量，但此类开采行为或会显著降低流域大部分区域内麦迪逊群含水层的测压水位面（potentiometric surface）。（伍德沃德-美国地质调查局（USGS））