Ground Water Depth Readings at BCEF/LTER Floodplain Sites, 1991-Present: Hourly

Campbell CR7 dataloggers were used at FP1A, FP2A, and FP4A to measure ground water and river levels (river levels only at FP4A) during the summer growing season. Each site has four wells being monitored and any river levels are in addition to these wells. A Druk Inc. sensor (model PDRC 10/D) was placed at the bottom of the 3 meter by 15 cm PVC well tubes and calibrated to output depth from forest floor to groundwater. Sensors are scanned every 5 minutes and hourly averages are output to a storage module.Campbell CR7型数据记录仪（Campbell CR7 dataloggers）被应用于FP1A、FP2A与FP4A三个站点，用于在夏季生长季内监测地下水与河道水位（仅FP4A站点监测河道水位）。每个站点设有四口监测井，河道水位监测为上述井水监测之外的补充项目。将德鲁克公司（Druk Inc.）型号为PDRC 10/D的传感器安置于3米长、管径15厘米的PVC监测井管底部，经校准后可输出林地表层至地下水的深度数据。所有传感器每5分钟完成一次数据扫描，并将小时平均值输出至存储模块。