Return period (years)

10

20

50

100

500

Return level (s)

38.45

37.75

37.28

37.08

36.85

Standard error

0.296

0.2379

0.174

0.148

0.155

95% CI

(37.86, 39.03)

(37.28, 38.21)

(36.93, 37.62)

(36.78, 37.36)

(36.54, 37.14)