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Q-2, r. 9.01 - Design code of a storm water management system eligible for a declaration of compliance
Section 38
Disposition versions
38. The storm pattern for sizing storm water management works for controlling erosion, erosion control rain, is the type II NRCS rain defined in Table 3.14 having a total rainfall level corresponding to 75% of the rainfall level associated with a duration of 24 hours and having a return period of 2 years based on the intensity-duration-frequency values of rainfalls.
The runoff volume to control erosion, Verosion, is the volume associated with the passage of the type II NRCS rain defined in the first paragraph.
Table 3.14 Erosion control rain
| Time | P/Ptotal(1) | Time | P/Ptotal(1) | |
| 00:00 | 0.000 | 11:00 | 0.235 | |
| 02:00 | 0.022 | 11:30 | 0.283 | |
| 04:00 | 0.048 | 11:45 | 0.357 | |
| 06:00 | 0.080 | 12:00 | 0.663 | |
| 07:00 | 0.098 | 12:30 | 0.735 | |
| 08:00 | 0.120 | 13:00 | 0.772 | |
| 08:30 | 0.133 | 13:30 | 0.799 | |
| 09:00 | 0.147 | 14:00 | 0.820 | |
| 09:30 | 0.163 | 16:00 | 0.880 | |
| 09:45 | 0.172 | 20:00 | 0.952 | |
| 10:00 | 0.181 | 24:00 | 1.000 | |
| 10:30 | 0.204 |
(1) Cumulated fraction of rainfall since the beginning of the rain in relation to the total level of the rain.
In force: 2020-12-31
38. The storm pattern for sizing storm water management works for controlling erosion, erosion control rain, is the type II NRCS rain defined in Table 3.14 having a total rainfall level corresponding to 75% of the rainfall level associated with a duration of 24 hours and having a return period of 2 years based on the intensity-duration-frequency values of rainfalls.
The runoff volume to control erosion, Verosion, is the volume associated with the passage of the type II NRCS rain defined in the first paragraph.
Table 3.14 Erosion control rain
| Time | P/Ptotal(1) | Time | P/Ptotal(1) | |
| 00:00 | 0.000 | 11:00 | 0.235 | |
| 02:00 | 0.022 | 11:30 | 0.283 | |
| 04:00 | 0.048 | 11:45 | 0.357 | |
| 06:00 | 0.080 | 12:00 | 0.663 | |
| 07:00 | 0.098 | 12:30 | 0.735 | |
| 08:00 | 0.120 | 13:00 | 0.772 | |
| 08:30 | 0.133 | 13:30 | 0.799 | |
| 09:00 | 0.147 | 14:00 | 0.820 | |
| 09:30 | 0.163 | 16:00 | 0.880 | |
| 09:45 | 0.172 | 20:00 | 0.952 | |
| 10:00 | 0.181 | 24:00 | 1.000 | |
| 10:30 | 0.204 |
(1) Cumulated fraction of rainfall since the beginning of the rain in relation to the total level of the rain.
