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STATION 86071 MELBOURNE REGIONAL OFFICE
PERIOD FROM 1980 T0 1989
UNITS MILLIMETRES BY TEN
LIST OF PRIMARY FALLS -- CHRONOLOGICAL ORDER
4 DAYS 5 DAYS 6 DAYS 7 DAYS 8 DAYS 10 DAYS 15 DAYS 20 DAYS 25 DAYS 30 DAYS MISSED AVERAGED
YEAR
1980 546 564 582 582 618 648 744 866 948 1218 0 0
1981 656 660 684 684 728 792 840 946 1102 1172 0 0
1982 450 450 450 450 450 454 454 520 618 626 0 0
1983 966 1012 1022 1028 1058 1108 1108 1138 1164 1282 0 0
1984 748 798 870 906 914 922 1002 1238 1280 1310 0 0
1985 718 752 776 778 780 878 1040 1204 1290 1368 0 0
1986 310 386 430 454 454 666 700 702 750 914 0 0
1987 624 632 634 638 658 764 862 866 1414 1424 0 0
1988 1024 1052 1096 1108 1108 1312 1404 1522 1614 1732 0 0
1989 746 746 746 764 764 764 904 1114 1268 1452 0 0
STATION 86071 MELBOURNE REGIONAL OFFICE
PERIOD FROM 1980 T0 1989
UNITS MILLIMETRES BY TEN
LIST OF PRIMARY FALLS -- NUMERICAL ORDER
4 DAYS 5 DAYS 6 DAYS 7 DAYS 8 DAYS 10 DAYS 15 DAYS 20 DAYS 25 DAYS 30 DAYS
RANK
1 1024 1052 1096 1108 1108 1312 1404 1522 1614 1732
2 966 1012 1022 1028 1058 1108 1108 1238 1414 1452
3 748 798 870 906 914 922 1040 1204 1290 1424
4 746 752 776 778 780 878 1002 1138 1280 1368
5 718 746 746 764 764 792 904 1114 1268 1310
6 656 660 684 684 728 764 862 946 1164 1282
7 624 632 634 638 658 764 840 866 1102 1218
8 546 564 582 582 618 666 744 866 948 1172
9 450 450 450 454 454 648 700 702 750 914
10 310 386 430 450 450 454 454 520 618 626
STATION 86071 MELBOURNE REGIONAL OFFICE
PERIOD FROM 1980 T0 1989
UNITS MILLIMETRES
NUMBER OF COMPLETE YEARS 10
STATISTICAL DATA DERIVED FROM LOGS OF PRIMARY SERIES
NUMBER OF DAYS MEAN STD DEV SKEW STD DEV KURT STD DEV
SKEW (1) (2) KURT (3)
4 1.8092 .1537 -.6083 .7746 -.5883 1.5492
5 1.8290 .1392 -.2561 .7746 -1.1797 1.5492
6 1.8440 .1360 -.1518 .7746 -1.3538 1.5492
7 1.8503 .1349 -.1102 .7746 -1.4295 1.5492
8 1.8587 .1347 -.2105 .7746 -1.3239 1.5492
10 1.9028 .1281 -.1424 .7746 -.6526 1.5492
15 1.9400 .1324 -.5623 .7746 -.2277 1.5492
20 1.9872 .1353 -.5258 .7746 -.7606 1.5492
25 2.0430 .1281 -.6907 .7746 -.8553 1.5492
30 2.0827 .1234 -1.0843 .7746 .2680 1.5492
NOTES -
1. IF THE LOGS OF THE FALLS COME FROM A NORMAL SERIES
THEIR SKEW IS APPROXIMATELY NORMALLY DISTRIBUTED WITH
MEAN ZERO AND STD. DEV. (6 / NO. OF YEARS)**0.5
2. (FOURTH MOMENT ABOUT MEAN)
KURTOSIS = ------------------------------- - 3
((SECOND MOMENT ABOUT MEAN)**2)
3. IF THE LOGS OF THE FALLS COME FROM A NORMAL SERIES
THE KURTOS IS APPROXIMATELY NORMALLY DISTRIBUTED WITH
MEAN ZERO AND STD. DEV. (24 / NO. OF YEARS)**0.5
FURTHER EXPLANATION OF NOTES 1 TO 3 AND SIGNIFICANCE
TABLES MAY BE FOUND IN THE TEXT:
SNEDECOR AND COCHRAN - STATISTICAL METHODS
PAGES 86,87 AND TABLE A-6
4. THE METHOD OF MOMENTS IS USED TO FIT THE DISTRIBUTION
STATION 86071 MELBOURNE REGIONAL OFFICE
PERIOD FROM 1980 T0 1989
UNITS MILLIMETRES
NUMBER OF COMPLETE YEARS 10
*** Derived from Primary Series -- Log Normality assumed ***
DURATION 4 DAYS 5 DAYS 6 DAYS 7 DAYS 8 DAYS 10 DAYS 15 DAYS 20 DAYS 25 DAYS 30 DAYS
ONCE IN 1 YEARS RAINFALL 54.6 55.0 58.2 58.2 61.8 69.4 82.6 86.6 101.4 120.0
ONCE IN 2 YEARS RAINFALL 71.8 74.6 74.6 76.4 76.4 79.2 90.4 111.4 126.8 131.0
ONCE IN 5 YEARS RAINFALL 96.6 101.2 102.2 102.8 105.8 110.8 110.8 123.8 141.4 145.2
ONCE IN 10 YEARS RAINFALL 101.4 101.7 104.3 105.5 107.5 116.7 128.7 144.7 161.1 174.2
ONCE IN 20 YEARS RAINFALL 116.2 115.0 117.6 118.8 121.0 130.6 144.7 163.1 180.4 194.2
ONCE IN 50 YEARS RAINFALL 133.3 130.3 132.9 134.1 136.6 146.5 162.9 184.1 202.3 216.9
ONCE IN 100 YEARS RAINFALL 146.8 142.1 144.7 145.9 148.6 158.8 177.0 200.4 219.3 234.4
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