Flood Risk and Vulnerability Analysis Project - Atlantic Climate ...

Storm Duration
Storm Duration
Storm Duration
Development of Projected Intensity-Duration-Frequency Curves
for Corner Brook and Goulds/Petty Harbour, Newfoundland May 16, 2012
Table 5-9 - St. John's A Projected IDF Tables, 2020 Time Period, Precipitation intensities over the
specified duration, mm/hr
Maximum, 2020 timeframe
Return period (years)
2 5 10 20 25 50 100
5 min 59.1 79.7 93.3 106.4 110.5 123.2 135.9
10 min 45.5 59.3 68.4 77.2 79.9 88.6 97.0
15 min 38.3 50.1 57.9 65.5 67.9 75.2 82.5
30 min 28.2 36.0 41.0 45.9 47.5 52.2 57.0
1 hr 20.2 25.0 28.1 31.1 32.0 35.0 37.9
2 hr 13.8 17.7 20.3 22.8 23.6 26.0 28.4
6 hr 7.6 9.3 10.4 11.4 11.7 12.7 13.8
12 hr 5.0 5.8 6.4 7.1 7.2 7.8 8.4
24 hr 3.0 3.5 3.9 4.2 4.2 4.6 4.9
90th Percentile, 2020 Time Period
Return period (years)
2 5 10 20 25 50 100
5 min 58.3 79.0 92.6 105.7 109.9 122.6 135.3
10 min 44.6 58.5 67.7 76.5 79.3 87.9 96.4
15 min 37.6 49.5 57.3 64.8 67.3 74.6 81.9
30 min 27.5 35.3 40.4 45.3 46.9 51.7 56.5
1 hr 19.6 24.4 27.6 30.6 31.5 34.4 37.4
2 hr 13.4 17.3 19.9 22.4 23.2 25.6 28.0
6 hr 7.4 9.0 10.1 11.2 11.5 12.5 13.6
12 hr 4.8 5.7 6.3 6.9 7.1 7.7 8.3
24 hr 2.9 3.3 3.7 4.1 4.1 4.5 4.8
Mean, 2020 Time Period
Return period (years)
2 5 10 20 25 50 100
5 min 57.5 78.2 91.9 105.1 109.2 122.0 134.7
10 min 42.6 56.6 65.9 74.8 77.6 86.4 94.9
15 min 35.8 47.8 55.6 63.2 65.7 73.1 80.4
30 min 25.8 33.6 38.8 43.8 45.4 50.2 55.1
1 hr 18.1 23.0 26.2 29.2 30.2 33.2 36.1
2 hr 12.4 16.3 18.9 21.4 22.2 24.6 27.0
6 hr 6.9 8.6 9.7 10.7 11.1 12.1 13.2
12 hr 4.4 5.3 5.9 6.6 6.7 7.3 7.9
24 hr 2.6 3.1 3.5 3.9 3.9 4.3 4.6
AMEC Environment & Infrastructure 36