Even in a given basin, different values of parameters were derived whenever analyzing a different rainfall event. In general, their representative values are determined as their means. In particular, when sufficient rainfall events are available, the mean value could be acceptable. However, when only a few events are available, the mean values can be somewhat biased (Yoo et al. 2007a). Based on Yoo et al. (2007b), at least 20 different rainfall events are required to estimate the acceptable mean values. In the case that the number of rainfall events is far smaller than 20, they proposed to use the mode, rather than the mean value. This study also considered this direction to determine the representative values of concentration time and storage coefficient for each basin. Table 5 summarizes the representative parameters determined for each basin and also provides their ratio () for reference:

Table 5

Representative UH parameters estimated by analyzing the observed data for each basin

Basin # (h) (h) (h/h)
3.0 3.3 1.1
4.1 4.4 1.1
6.2 6.8 1.1
3.9 3.7 1.0
2.5 2.1 0.8
3.5 4.0 1.1
10.5 15.5 1.5
7.3 7.1 1.0
6.8 7.8 1.1
10 10.3 9.9 1.0
11 6.0 6.3 1.1
12 8.8 11.8 1.3
13 11.1 15.2 1.4
14 7.4 9.3 1.3
15 14.9 21.0 1.4
16 19.8 28.0 1.4
17 11.0 11.9 1.1
18 27.5 36.9 1.3
19 20.2 28.0 1.4
20 19.1 30.1 1.6
21 22.0 28.1 1.3
Basin # (h) (h) (h/h)
3.0 3.3 1.1
4.1 4.4 1.1
6.2 6.8 1.1
3.9 3.7 1.0
2.5 2.1 0.8
3.5 4.0 1.1
10.5 15.5 1.5
7.3 7.1 1.0
6.8 7.8 1.1
10 10.3 9.9 1.0
11 6.0 6.3 1.1
12 8.8 11.8 1.3
13 11.1 15.2 1.4
14 7.4 9.3 1.3
15 14.9 21.0 1.4
16 19.8 28.0 1.4
17 11.0 11.9 1.1
18 27.5 36.9 1.3
19 20.2 28.0 1.4
20 19.1 30.1 1.6
21 22.0 28.1 1.3

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