The following data are annual 15-min peak rainfall intensities I (in./hr) for 9 years of record. Compute and plot the log,,-normal frequency curve and the data. Use the Weibull plotting position formula. Using both the curve and the mathematical equation estimate (a) the 25-yr, 15-min peak rainfall intensity; (b) the return period for an intensity of 7 in./hr; (c) the probability that the annual maximum 15-min rainfall intensity will be between 4 and 6 in./hr.

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The following data are annual 15-min peak rainfall intensities I (in./hr) for 9 years of record. Compute and plot the log,,-normal frequency curve and the data. Use the Weibull plotting position formula. Using both the curve and the mathematical equation estimate (a) the 25-yr, 15-min peak rainfall intensity; (b) the return period for an intensity of 7 in./hr; (c) the probability that the annual maximum 15-min rainfall intensity will be between 4 and 6 in./hr.

 

Year
Year
1972
3.16
1977
2.24
1973
2.29
1978
4.37
1974
4.07
1979
6.03
1975
4.57
1980
2.75
1976
2.82
Transcribed Image Text:Year Year 1972 3.16 1977 2.24 1973 2.29 1978 4.37 1974 4.07 1979 6.03 1975 4.57 1980 2.75 1976 2.82
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