Based on the observation data of seepage quantity obtained from the dam of a annual storage reservoir and that of a pumped storage power station,the regularities and characteristic values are analyzed,the statistical model and regression model are established,and the affecting components are calculated by quantitative analysis.

According to the characteristics of multiannual storage plant, this paper advances the method of changing water volumes s.

However,when the SDP is applied to the optimal operation of multi-reservoirs system with multi-annual regulating reservoirs,the problems of "curse of dimensionality" will be aroused and the characteristic of uncertain regulated cycles can t be showed.

Stochastic Dynamic Programming (SDP) is a basic method to achieve optimal operation of reservoir, while which is applied to multi-reservoir containing multi-annual regulating reservoir with characteristic of unregulated cycle, the problem of the "curse of dimensionality" will be aroused and the characteristic of multi-annual regulating reservoir can t be showed.

Study on the water level at the end of year for carryover storage reservoir;