A method for drawing P~P_a~R correlation diagram using the storage model

A method for drawing the P~Pa~R correlation diagram by using the storage model is proposed in this paper. Firstly, based on the historical data and the characteristics of the basin, the structure of Nature Storage model is selected, and the parameters of the model are optimized. Secondly, based on the average of cumulative process of rainfall and corresponding runoff events, the P~Pa~R correlation diagram can be drawn. This method has been applied to Heihe basin and the results are satisfisfactory. 