Return period (year)

10

20

50

100

500

Return level (s)

10.09

10.03

9.98

9.96

9.92

Standard errors

0.0361

0.0458

0.0698

0.0895

0.130

95% CI

[10.02, 10.16]

[9.94, 10.12]

[9.85, 10.12]

[9.78, 10.13]

[9.66, 10.17]