Groundwater levels in Dead Run watershed, Maryland, USA

This resource contains groundwater level data from 39 wells in Dead Run watershed near Woodlawn, MD, USA. Boreholes (51-mm diameter) were drilled using a Shaw backpack portable drill, with 25.4-mm ID PVC pipes inserted to serve as wells, each screened 0.3048 m at its lower end. Wells are installed in pairs with bottom elevations differing by about 1 to 3 m. Well pairs are installed either in the riparian zone or at the hilltop, relative to the Dead Run channel. Between 4 and 8 wells comprise a transact perpendicular to the stream. Wells are outfitted with vanEssen Micro-Diver pressure transducers. Barometric pressure is measured at one location using a vanEssen Baro-Diver. Groundwater level below land surface is calculated from site-specific information on location of the pressure transducer sensor point below land surface. Pressure transducer data are recorded at 5-minute intervals. Instruments were deployed in 2015 and maintained until failure or end of a project. Manual downloads of water pressure data are done every 5 months; downloads of barometric pressure data are done every 2.5 months. The wells are located in the Piedmont physiographic province, in suburban Baltimore, Maryland, USA in either saprolite or highly weathered fractured bedrock.

本资源收录了位于美国马里兰州伍德劳恩附近Dead Run流域内39个井点的地下水水位数据。采用Shaw背包式便携钻机钻孔（孔径51毫米），并插入直径25.4毫米的PVC管道作为井管，井管底部设有0.3048米的筛网。井管以成对形式安装，底部高程相差约1至3米。井对位于河岸带或山顶，与Dead Run河渠相对。4至8个井点组成一个垂直于河流的横断面。井点配备vanEssen Micro-Diver压力传感器。使用vanEssen Baro-Diver在一点测量气压。基于地下压力传感器点在地面以下的具体位置信息，计算地面以下的水位。压力传感器数据以5分钟为间隔进行记录。仪器于2015年部署，并一直维护至损坏或项目结束。每5个月手动下载一次水压数据；每2.5个月下载一次气压数据。井点位于美国马里兰州巴尔的摩郊区的Piedmont地貌区，位于风化壳或高度风化的裂隙基岩中。