“…Figure 2 shows the variation of the monthly average of rainfall and water volume, two time series of the variables. Similar to the study by Avilés et al [15], to capture short, medium and large term droughts, time windows of 1, 3, 6, 9 and 12 months were selected for the generation of ten time series with varying time scales, respectively five time series of the total rainfall (PR1, PR3, PR6, PR9 and PR12) in mm, and five time series of the water volume entering the reservoir (VS1, VS3, VS6, VS9 and VS12) in hm 3 . The monthly seasonality is accounted by the division of the ten time series for each month.…”