Environmental Engineering Reference
In-Depth Information
Table 6.17 Data preparation for the Gumbel method
Observed discharge X-value ranked
Calculated serial number
X-value
9
0 % confidence (lower)
90 % confidence (upper)
18.7
29
18.65
18.65
28.96
30.3
10
30.3
28.84
44.97
34.8
12
34.73
32.43
51.04
42.1
26
42.1
37.78
60.89
42.4
11
42.38
37.97
61.31
50.4
28
50.38
43.21
71.67
54.5
18
54.43
45.71
76.7
59.4
9
59.4
48.59
82.52
61.5
4
61.53
49.81
85.02
65.2
14
65.19
51.91
89.35
70.8
25
70.79
54.93
95.58
76.8
7
76.84
58.16
102.15
80
2
79.97
59.82
105.52
80.5
17
80.41
60.04
105.98
81.5
13
81.45
60.57
107.16
83.2
20
83.13
61.42
108.85
84.7
24
84.7
62.18
110.6
86.4
15
86.32
63.06
112.13
86.5
8
86.48
63.17
112.39
87.3
3
87.31
63.61
113.18
88
6
87.98
63.95
113.98
89.1
27
89.01
64.39
115.06
89.1
31
89.01
64.39
115.06
89.3
19
89.18
64.51
115.34
92.3
21
92.38
66.11
118.43
101.2
5
101.29
70.54
127.48
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