The observation of longitudinal horizontal displacement of an earth dam is to observe the relative strain of the length between two displacement points.

The exit dam has a significant effect on MRT, while the influence of internal structure consisting of various longitudinal ribs and circular ribs is mainly dependent on the height of circular ribs.

Steep and antithetic platy structure of rock mass and geomorphology of the longitudinal valley in the dam site area cause wide-range toppling deformation on the cross-strait slope.