Thirteen flash flood events with total runoff volume more than the threshold 100 m3 have been successfully recorded during the five rainy seasons, though the observation system failed to record the other two significant events on April 12, 2015, and on February 22, 2016, due to technical problems. Therefore, the average occurrence of flash flood events is estimated at 3.0 times in a rainy season. The largest event occurred on April 13, 2016, as shown in Figure 3. Table 2 summarizes the date of occurrence, the starting time, the ending time, , , , , , and for each flash flood event.
Figure 3. Photos shot during the flash flood event on April 13, 2016, with an interval of 1 hour
Table 2. Observed rainfall-runoff events with total runoff volume more than 100 m3