Results may vary. Typically, using additional calibration and validation events will improve performance. However, the number of calibration and validation events used within an actual study will depend upon the available time and budget. Also, data considerations (e.g., where, when, and how many accurate observations are available for use?) will dictate how many events can be used for model calibration and validation. In this example, three events were used for model calibration and one event was used for model validation.
The results that were obtained are acceptable. However, the predictive power of the model could be improved by using additional calibration and validation events. In the actual study, the 1986, 1995, 1997, and 2006 events were used for model calibration. The January 1997 calibration event was not used to form the validation parameter set because precipitation data was found to be inadequate.
