Level gauges can be used to monitor the safety of water facilities such as reservoirs and dikes. Abnormal changes in water level may indicate safety hazards, such as water level exceedance in the reservoir spillway may lead to spillway damage, and abnormal increase in water level around the levee may indicate seepage or dam stability problems. Real-time monitoring of water level changes in water bodies is essential for flood forecasting and reservoir operation and management. Continuous monitoring of water levels allows for timely understanding of rising or falling trends in water levels so that timely adjustments and countermeasures can be made.