Return period (year)

10

20

50

100

350

Return level (s)

9.74

9.69

9.65

9.62

9.58

Standard errors

0.0255

0.0286

0.00342

0.0393

0.0496

95% CI

[9.69, 9.79]

[9.64, 9.75]

[9.58, 9.71]

[9.54, 9.69]

[9.48, 9.67]