Groundwater - hourly groundwater levels from 9 locations at Cabauw

Groundwater levels at Cabauw have been measured since August 2003 in two fields south of the tower. Nine piezometers were placed in a row. Initially, 6 of those piezometers contained pressure transducers (of the brand Keller) to measure levels automatically every 4 hours. On 9 July 2010, the temporal resolution was increased to hourly. Several sensors have stopped working since 2003. Piezometers that were not measured automatically were measured during each filed visit, which was initially every 2 weeks, but has become longer towards the end of the measurement period.卡堡（Cabauw）区域铁塔南侧的两块农田自2003年8月起启动地下水位监测工作。本次监测共布设9根渗压计（piezometer）呈一字排列。初期，其中6根渗压计安装了凯勒（Keller）品牌的压力传感器（pressure transducer），可每4小时自动采集地下水位数据。2010年7月9日，监测时间分辨率提升至每小时1次。自2003年起，已有多台传感器停止工作。未实现自动监测的渗压计，需在每次野外巡查中开展人工监测：初期巡查频率为每2周1次，监测周期后期该间隔逐步延长。