Fuctuations of effective annual precipitation

A mathematical study is presented involving the fluctuation in effective precipitation and resulting effects on streamflow for the water year. Effective precipitation is defined as the total precipitation minus evapotranspiration for the water year. This investigation is made by random time series as a yardstick to the effective precipitation and streamflow. The statistical technique is exclusively the series correlation process, through the analysis of range and runs. The results of the study indicate a possibility of predicting future long-range water yields from the time series computations.