An abnormal groundwater level in the slope was observed in 2016. This abnormal level was caused by the leakage and rupture of water pipelines connecting pressurized concrete towers. Electronic wells can be used for water level observation. In the present study, three locations were selected for the new installation of such wells. Big
data analysis revealed that the rate at which the groundwater level decreases has a stratified nature. Even if it is not possible to verify whether the saturation state. Generally, the relationship between rainfall and groundwater level can be used to select the linear segment of the groundwater level decline rate close to the saturation state, with a similar rate range observed across an entire given layer. Changes in the displacement of the WS-066 slope soil layer accumulate toward the surface with rate stratification, with additional slope stratification related to rock fall, rock quality designation,and suspected oblique slopes. In addition, rate stratification is related to the engineering factors of the location.
Key Words: Electronic water level observation well, Groundwater level decline rate, Saturation