Discussion on fall of level at the down reach of dams;

All research results identify that the mode of the decrease of reservoir level is key mode to control stability of the landslide and must be control mode in harness of the landslide.

Stability of river bank subject to drawdown of water level;

The wide scope development of ground water has been started since the end of seventies in Harbin f which leads to a sharp decline of ground water table and a continuously expansivecone of depression.