Return period (years)

10

20

50

100

500

Return level (years)

115.9

116.7

117.6

118.1

119.0

Standard error

0.5771

0.7162

1.030

1.307

1.949

95% CI

(114.7, 117.0)

(115.3, 118.1)

(115.6, 119.6)

(115.6, 120.7)

(115.2, 122.8)