This paper has a seepage measuring device installed on the water retaining wall at the bottom of the dam, but it has no seepage count and periodically uses underground water handling method to measure the level of seepage. Accordingly, observation of seepage quantities generated by the dam body is used as an important data to assess the safety of the dam body, so it is considered to improve the seepage quantity measuring device.

In this study, in order to measure the seepage through dam body and foundation, we conduct geophysical survey such as electromagnetic survey in A dam that has not been measured quantitative seepage. Therefore we will analyze the reasons and establish the improvement.