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 5-13 - St. John's Composite Record, Updated March 2012 Projected IDF Tables, 2050 Time
Period, Precipitation intensities over the specified duration, mm/hr
Maximum, 2050 timeframe
Return period (years)
2 5 10 20 50 100
5 min 59.6 77.8 89.8 101.4 116.5 127.7
10 min 47.2 59.7 67.8 75.9 86.3 93.9
15 min 40.8 51.5 58.5 65.1 74.1 80.7
30 min 31.2 39.2 44.4 49.6 56.0 61.0
1 hr 23.1 29.1 32.9 36.6 41.4 44.9
2 hr 15.8 20.5 23.6 26.5 30.2 33.0
6 hr 8.7 10.9 12.5 13.9 15.7 17.1
12 hr 5.7 7.1 8.1 9.0 10.2 11.1
24 hr 3.4 4.2 4.7 5.2 5.8 6.4
90th Percentile, 2050 Time Period
Return period (years)
2 5 10 20 50 100
5 min 58.9 77.2 89.2 100.9 116.0 127.3
10 min 45.0 57.7 65.9 74.1 84.7 92.4
15 min 38.8 49.7 56.7 63.4 72.5 79.2
30 min 29.3 37.3 42.6 47.9 54.3 59.4
1 hr 21.4 27.4 31.2 35.0 39.8 43.3
2 hr 14.7 19.4 22.4 25.3 29.0 31.8
6 hr 8.3 10.5 12.1 13.5 15.3 16.7
12 hr 5.4 6.8 7.8 8.7 9.9 10.8
24 hr 3.2 4.0 4.5 5.1 5.7 6.2
Mean, 2050 Time Period
Return period (years)
2 5 10 20 50 100
5 min 57.4 75.9 88.0 99.8 115.0 126.3
10 min 43.2 56.1 64.4 72.7 83.4 91.1
15 min 37.1 48.1 55.3 62.0 71.2 77.9
30 min 27.6 35.8 41.1 46.5 53.0 58.1
1 hr 19.9 25.9 29.8 33.6 38.5 42.0
2 hr 13.7 18.4 21.4 24.3 28.0 30.8
6 hr 7.6 9.8 11.3 12.7 14.5 15.9
12 hr 4.8 6.2 7.2 8.1 9.4 10.3
24 hr 2.9 3.7 4.2 4.7 5.3 5.8
AMEC Environment & Infrastructure 40