Recorded annual maximum 24-hour rainfall magnitudes at station X are as under:
|
Year |
Rainfall (cm) |
|
1960 |
12.0 |
|
1961 |
6.0 |
|
1962 |
4.8 |
|
1963 |
7.9 |
|
1964 |
12.0 |
|
1965 |
14.2 |
|
1966 |
13.6 |
|
1967 |
6.0 |
|
1968 |
3.7 |
|
1969 |
2.9 |
What is the return period, in years, for a 6.0 cm annual rainfall according to Weibull formula?
1
10/7,
2
11/7
3
20/13
4
5/3