3. RESULTS
3.1 Runoff and Sediment Yield
To investigate the temporal relationship between runoff and SY, this study used observational data of the Water Resources Agency, Ministry of Economic Affairs during 1999–2009 to plot the temporal distribution of runoff and SY (Figure 7) and display the daily runoff and SY values. Figure 7 shows that the peaks of runoff and SY occurred mostly during July–October, and mainly in the typhoon season in Taiwan. The maximum daily runoff and maximum daily SY occurred during Typhoon Morakot (August 8, 2009), and the values were 228.55 and 10.35 mm, respectively.