REPS - Technical Memorandum

9 hour 10.5 12.2 17.8 21.8 25.9 31.5 35.9
12 hour 8.78 10.3 15.1 18.6 22.1 26.9 30.7
18 hour 6.85 8.02 11.9 14.7 17.5 21.4 24.6
24 hour 5.71 6.70 9.96 12.3 14.8 18.2 20.9
30 hour 4.95 5.80 8.65 10.7 12.9 15.9 18.3
36 hour 4.38 5.14 7.68 9.54 11.5 14.2 16.4
48 hour 3.60 4.22 6.31 7.87 9.50 11.8 13.7
72 hour 2.68 3.14 471 5.89 7.14 8.98 10.5
96 hour 2.16 2.52 3.78 4.73 5.76 7.26 8.52
120 hour 1.81 2.12 3.17 3.97 4.83 6.10 7.16
144 hour 1.57 1.83 ae) 3.42 4.16 5.24 6.15
168 hour 1.39 1.62 2.41 3.01 3.65 4.59 5.37

Table 2: IFD Table - Rainfall intensities with 20% increase

Annual Exceedance Probability (AEP)

Duration 63.2% 50%# 20%* 10% 5% 2% 1%
1min 207.6 234 315.6 369.6 421.2 486 535.2
2 min 176.4 200.4 276 327.6 379.2 450 504
3 min 165.6 188.4 258 304.8 351.6 415.2 463.2
4min aia 178.8 243.6 286.8 330 385.2 428.4
Smin 150 170.4 231.6 272.4 310.8 361.2 399.6
10 min 123.6 139.2 186 217.2 246 283.2 310.8
15 min 104.4 117.72 158.4 183.6 208.8 238.8 261.6
20 min 91.2 102.84 138 160.8 182.4 210 230.4
25 min 81.36 91.8 123.6 144 164.4 189.6 207.6
30 min 73.68 83.16 112.2 130.8 150 172.8 190.8
45 min 58.32 66 89.88 105.84 121.2 141.6 157.2
1 hour 48.96 55.56 76.2 90.24 103.8 122.4 135.6
1.5 hour 38.04 43.32 60.24 71.76 83.28 98.64 110.64
2 hour 31.8 36.36 50.88 60.96 71.04 84.72 95.4
3 hour 24.6 28.32 40.2 48.48 56.88 68.28 77.28
4.5 hour 19.2 22.08 31.8 38.64 45.48 54.96 62.4
6 hour 16.08 18.6 27 32.88 38.88 47.04 53.52