The annual maxima were fit to a GEV distribution. This distribution was used to generate predictions for return periods (and corresponding exceedence probabilities) of 500 years, 200 years, 100 years, 50 years, 25 years, 10 years, 5 years, 3 years, and 2 years. Standard methodology for rainfall is to apply Weiss factors based on the data being collected as hourly data. The GEV with and without Weiss factors was reported.
Station_GEV_Reprocessed_8_2012_all.xlsx
GEV Without Weiss Factor - Booksville Combined | |
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Probability | RP | Hr1 | Hr2 | Hr6 | Hr12 | Hr24 | Hr48 | Hr72 | Hr96 | Hr120 |
0.998 | 500 | 3.802 | 4.658 | 7.51 | 13.348 | 16.829 | 23.384 | 27.468 | 28.38 | 27.354 |
0.995 | 200 | 3.576 | 4.433 | 6.871 | 11.239 | 13.919 | 18.462 | 21.041 | 21.874 | 21.578 |
0.99 | 100 | 3.389 | 4.24 | 6.375 | 9.808 | 11.997 | 15.405 | 17.207 | 17.977 | 18.022 |
0.98 | 50 | 3.186 | 4.023 | 5.866 | 8.503 | 10.284 | 12.821 | 14.075 | 14.781 | 15.037 |
0.96 | 25 | 2.965 | 3.78 | 5.342 | 7.307 | 8.753 | 10.63 | 11.508 | 12.154 | 12.526 |
0.9 | 10 | 2.64 | 3.406 | 4.617 | 5.867 | 6.958 | 8.217 | 8.792 | 9.363 | 9.783 |
0.8 | 5 | 2.358 | 3.068 | 4.028 | 4.852 | 5.729 | 6.668 | 7.122 | 7.639 | 8.04 |
0.667 | 3 | 2.116 | 2.769 | 3.549 | 4.116 | 4.857 | 5.625 | 6.033 | 6.511 | 6.873 |
0.5 | 2 | 1.885 | 2.475 | 3.112 | 3.504 | 4.146 | 4.81 | 5.206 | 5.652 | 5.968 |
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GEV With Weiss Factor - Brooksville Combined | |
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Probability | RP | Hr1 | Hr2 | Hr6 | Hr12 | Hr24 | Hr48 | Hr72 | Hr96 | Hr120 |
0.998 | 500 | 4.344 | 4.968 | 7.669 | 13.488 | 16.917 | 23.449 | 27.515 | 28.417 | 27.381 |
0.995 | 200 | 4.086 | 4.728 | 7.017 | 11.357 | 13.991 | 18.514 | 21.077 | 21.902 | 21.600 |
0.99 | 100 | 3.872 | 4.522 | 6.510 | 9.911 | 12.059 | 15.448 | 17.236 | 18.000 | 18.040 |
0.98 | 50 | 3.640 | 4.291 | 5.990 | 8.592 | 10.337 | 12.857 | 14.099 | 14.800 | 15.052 |
0.96 | 25 | 3.388 | 4.031 | 5.455 | 7.384 | 8.799 | 10.660 | 11.528 | 12.170 | 12.539 |
0.9 | 10 | 3.016 | 3.632 | 4.715 | 5.929 | 6.994 | 8.240 | 8.807 | 9.375 | 9.793 |
0.8 | 5 | 2.694 | 3.272 | 4.113 | 4.903 | 5.759 | 6.687 | 7.134 | 7.649 | 8.048 |
0.667 | 3 | 2.418 | 2.953 | 3.624 | 4.159 | 4.882 | 5.641 | 6.043 | 6.519 | 6.880 |
0.5 | 2 | 2.154 | 2.640 | 3.178 | 3.541 | 4.168 | 4.823 | 5.215 | 5.659 | 5.974 |
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Weiss Factors | 1.1425 | 1.0665 | 1.0212 | 1.0105 | 1.0052 | 1.0026 | 1.0017 | 1.0013 | 1.0010 |