Environmental Engineering Reference
In-Depth Information
Table 6.17 (continued)
Observed discharge X-value ranked
Calculated serial number
X-value
9 0 % confidence (lower)
90 % confidence (upper)
119.4
23
119.31
79.24
145.29
129.3
22
129.18
83.91
154.9
182.9
16
182.84
108.81
205.14
205
30
205.14
118.28
226.12
480
1
494.51
219.12
508.02
X-value ranked
Serial number
Return rank
Return period calculation
90 % confidence (lower)
90 % confidence (upper)
18.7
29
1.03
1.01
1.01
1.07
30.3
10
1.07
1.08
1.07
1.29
34.8
12
1.1
1.13
1.1
1.4
42.1
26
1.14
1.24
1.17
1.63
42.4
11
1.19
1.24
1.17
1.64
50.4
28
1.23
1.39
1.26
1.92
54.5
18
1.28
1.48
1.3
2.07
59.4
9
1.33
1.59
1.36
2.26
61.5
4
1.39
1.64
1.38
2.34
65.2
14
1.45
1.74
1.42
2.49
70.8
25
1.52
1.9
1.49
2.73
76.8
7
1.6
2.1
1.6
3
80
2
1.7
2.2
1.6
3.1
80.5
17
1.8
2.2
1.6
3.1
81.5
13
1.9
2.2
1.6
3.2
83.2
20
2
2.3
1.6
3.3
84.7
24
2.1
2.3
1.7
3.3
86.4
15
2.3
2.4
1.7
3.4
86.5
8
2.5
2.4
1.7
3.4
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