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Stormwater Management Plan
Attached to the e-mail MCU16/0066 & OPW16/0133 - Engineering report & Stormwater Mgmt Plan (2 of 4).
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Log in to see the plans as drawnRational Method Data
Location: Cooroy
Australian Rainfall & Runoff IFD Coefficents
2I 2I 2I 50I 50I 50I F2 F50 G
1 12 72 1 12 72
50.33 10.62 3.48 91.03 24.96 8.8 4.39 17.57 0.13
Rainfall Intensity (mm/hr)
DURATION AVERAGE RECURRENCE INTERVAL (years)
hours minutes 1 2 5 10 20 50 100 200 500
0.08 5 124 158 195 217 247 286 317 347 389
0.10 6 116 148 184 204 232 269 298 327 366
0.17 10 96 122 151 168 191 222 246 270 303
0.25 15 80 102 127 141 161 187 207 228 255
0.33 20 70 89 111 124 141 164 182 200 224
0.42 25 63 80 100 111 127 147 163 180 202
0.5 30 57 73 91 101 116 135 149 164 184
0.75 45 45.9 59 73 82 94 109 121 133 150
1 60 39.1 50 63 70 80 93 103 114 128
1.5 90 30.3 39.0 49.7 56 65 76 85 94 106
2 120 25.2 32.6 42.0 47.7 55 66 74 82 93
3 180 19.4 25.2 33.1 38.0 44.4 53 60 67 77
4.5 270 14.9 19.5 26.1 30.2 35.6 43.0 48.8 55 63
6 360 12.3 16.3 22.0 25.7 30.4 37.0 42.2 47.6 55
9 540 9.50 12.6 17.4 20.4 24.4 29.9 34.4 39.0 45.6
12 720 7.89 10.5 14.7 17.4 20.9 25.8 29.7 33.9 39.8
18 1080 6.20 8.29 11.6 13.9 16.7 20.7 23.9 27.3 32.1
24 1440 5.23 6.99 9.87 11.8 14.2 17.6 20.4 23.4 27.6
30 1800 4.56 6.11 8.66 10.3 12.5 15.6 18.0 20.7 24.4
36 2160 4.07 5.46 7.76 9.28 11.2 14.0 16.2 18.6 22.1
48 2880 3.38 4.54 6.49 7.79 9.46 11.8 13.7 15.8 18.7
72 4320 2.55 3.44 4.95 5.97 7.27 9.12 10.6 12.2 14.5
Catchment Data
Variable Value Unit
Area 0.9241 ha
C10 0.68 fraction
tc 5.9 minutes
Rational Results
AVERAGE RECURRENCE INTERVAL (years)
Variable 1 2 5 10 20 50 100
Freq Factor 0.544 0.578 0.646 0.68 0.714 0.782 0.816
Intensity (mm/hr) 117.1 149.1 184.6 205.2 233.6 270.9 299.5
Discharge (m3/s) 0.164 0.221 0.306 0.358 0.428 0.544 0.628
[OCR of page images]
Rational Method Data
Location: Cooroy
Australian Rainfall & Runoff IFD Coefficents
ah 2h 2l72 50], 5012 50172 F2 F50 G
50.33 10.62 3.48 | 91.03 | 24.96 8.8 4.39 17.57 0.13
Rainfall Intensity (mm/hr
DURATION AVERAGE RECURRENCE INTERVAL (years)
hours minutes 1 2 5 10 20 50 100 200 500
0.08 5 124 158 195 217 247 286 317 347 389
0.10 6 116 148 184 204 232 269 298 327 366
0.17 10 96 122 151 168 191 222 246 270 303
0.25 15 80 102 127 141 161 187 207 228 255
0.33 20 70 89 111 124 141 164 182 200 224
0.42 25 63 80 100 111 127 147 163 180 202
0.5 30 57 73 91 101 116 135 149 164 184
0.75 45 45.9 59 73 82 94 109 121 133 150
1 60 39.1 50 63 70 80 93 103 114 128
1.5 90 30.3 39.0 | 49.7 56 65 76 85 94 106
2 120 25.2 32.6 | 42.0 47.7 55 66 74 82 93
3 180 19.4 25.2 | 33.1 38.0 44.4 53 60 67 77
45 270 14.9 19.5 | 26.1 30.2 35.6 43.0 48.8 55 63
6 360 12.3 16.3 | 22.0 25.7 30.4 37.0 42.2 47.6 55
9 540 9.50 12.6 17.4 20.4 24.4 29.9 34.4 39.0 45.6
12 720 7.89 10.5 14.7 17.4 20.9 25.8 29.7 33.9 39.8
18 1080 6.20 8.29 11.6 13.9 16.7 20.7 23.9 27.3 32.1
24 1440 5.23 6.99 | 9.87 11.8 14.2 17.6 20.4 23.4 27.6
30 1800 4.56 6.11 8.66 10.3 12.5 15.6 18.0 20.7 24.4
36 2160 4.07 5.46 | 7.76 9.28 11.2 14.0 16.2 18.6 22.1
48 2880 3.38 4.54 | 6.49 7.79 9.46 11.8 13.7 15.8 18.7
72 4320 2.55 3.44 | 4.95 5.97 7.27 9.12 10.6 12.2 14.5
Catchment Data
Variable | Value Unit
Area 0.9241 ha
Cio 0.68 fraction
te 5.9 minutes
Rational Results
AVERAGE RECURRENCE INTERVAL (years
Variable 1 2 5 10 20 50 100
Freq Factor 0.544 | 0.578 | 0.646 | 0.68 0.714 | 0.782 | 0.816
Intensity (mm/hr) 117.1 | 149.1 | 184.6 | 205.2 | 233.6 | 270.9 | 299.5
Discharge (m°/s) 0.164 | 0.221 | 0.306 | 0.358 | 0.428 | 0.544 | 0.628
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