The use of video borescope for inspection of piezometers in landfills

Abstract

Piezometers are devices that measure the distribution of piezometric heads in the waste mass of landfills. These instruments present a critical role in determining the safety of landfill engineering works. However, piezometers require regular inspections, and advancements in technology have enabled the performance of more accurate monitoring within these devices. A depth sensor is used for this monitoring, but there are several challenges when taking measurements. This study aims to evaluate the conditions inside piezometers using a full-scale video borescope technique. The integrity of piezometers was assessed based on real-time images, which allowed the diagnosis of each pipe. This method can detect the presence of gases, obstructions, and damage caused to the piezometers, which may be associated with the evolution of the landfilling operation. The damage may be caused by the enlargement of the cells with the disposal of more waste and covering layers. The study concludes that using a videoscope to inspect piezometers is a low-cost technique that assists in the diagnosis of these instrument conditions.