Return period (year)

10

20

50

100

500

Return level (s)

11.48

11.43

11.38

11.35

11.31

Standard errors

0.0375

0.0398

0.0503

0.0603

0.0814

95% CI

[11.41, 11.55]

[11.35, 11.50]

[11.28, 11.47]

[11.23, 11.47]

[11.23, 11.47]