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Q-2, r. 9.01 - Design code of a storm water management system eligible for a declaration of compliance
Section 76
Disposition versions
76. To minimize accelerated erosion of receiving lakes and watercourses, the average flow coming out of the territory drained by a storm water management system at the end of the work during the passage of erosion control rain, erosion, must not exceed the value established using equation 3-19; if the value obtained according to the equation is less than 5 L/s, the value of 5 L/s must be used.
Erosion control rain is rainfall having a total rainfall level corresponding to 75% of the rainfall level associated with a period of 24 hours and having a 2-year return period based on the rainfall intensity-duration-frequency values.
Equation 3-19: Q̅erosion = Verosion/86,400
where:
| Q̅erosion | = | Average flow leaving during the passage or the erosion control rain (m3/s); | |
| Verosion | = | Runoff volume to be controlled for erosion; | |
| 86,400 | = | Number of seconds in 24 hours. |
In force: 2020-12-31
76. To minimize accelerated erosion of receiving lakes and watercourses, the average flow coming out of the territory drained by a storm water management system at the end of the work during the passage of erosion control rain, erosion, must not exceed the value established using equation 3-19; if the value obtained according to the equation is less than 5 L/s, the value of 5 L/s must be used.
Erosion control rain is rainfall having a total rainfall level corresponding to 75% of the rainfall level associated with a period of 24 hours and having a 2-year return period based on the rainfall intensity-duration-frequency values.
Equation 3-19: Q̅erosion = Verosion/86,400
where:
| Q̅erosion | = | Average flow leaving during the passage or the erosion control rain (m3/s); | |
| Verosion | = | Runoff volume to be controlled for erosion; | |
| 86,400 | = | Number of seconds in 24 hours. |
