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Q-2, r. 9.01 - Design code of a storm water management system eligible for a declaration of compliance
Section 97
Disposition versions
97. The sizing of the flow control device of the orifice or orifice plate type must be established using equation 4-1 if a maximum flow is used for design purposes or equation 4-2 if an average flow is used for design purposes.
Equation 4-1:
where:
| A | = | Flow section of the orifice (m2); | |
| Q | = | Flow leaving an orifice ensuring compliance with paragraph 1, 2 or 3 of section 94 (m3/s); | |
| C | = | Discharge coefficient of the orifice; minimum value 0.60; | |
| 9.81 | = | Gravitational acceleration (m/s2) | |
| H1 | = | Vertical distance between the centre of the orifice and the average water level reached upstream of the orifice; | |
| H2 | = | Vertical distance between the centre of the orifice and the water level downstream of the orifice (m); if the downstream side of the orifice is not submerged and is free-flowing, then H2=0. |
Equation 4-2:
where:
| A | = | Flow section of the orifice (m2); | |
| Q̅erosion | = | Average outlet flow during the passage of erosion control rain; | |
| C | = | Discharge coefficient of thew orifice; minimum value: 0.60; | |
| 9.81 | = | Gravitatinal acceleration (m/s2); | |
| H1 | = | Vertical distance between the centre of the orifice and the average water level reached upstream of the orifice; the average level corresponds to the average between the maximum level and the level of the centre of the orifice; | |
| H2 | = | Vertical distance between the centre of the orifice and the water level downstream of the orifice (m); if the downstream side of the orifice is not submerged and is free-flowing, then H2=0. |
In force: 2020-12-31
97. The sizing of the flow control device of the orifice or orifice plate type must be established using equation 4-1 if a maximum flow is used for design purposes or equation 4-2 if an average flow is used for design purposes.
Equation 4-1:
where:
| A | = | Flow section of the orifice (m2); | |
| Q | = | Flow leaving an orifice ensuring compliance with paragraph 1, 2 or 3 of section 94 (m3/s); | |
| C | = | Discharge coefficient of the orifice; minimum value 0.60; | |
| 9.81 | = | Gravitational acceleration (m/s2) | |
| H1 | = | Vertical distance between the centre of the orifice and the average water level reached upstream of the orifice; | |
| H2 | = | Vertical distance between the centre of the orifice and the water level downstream of the orifice (m); if the downstream side of the orifice is not submerged and is free-flowing, then H2=0. |
Equation 4-2:
where:
| A | = | Flow section of the orifice (m2); | |
| Q̅erosion | = | Average outlet flow during the passage of erosion control rain; | |
| C | = | Discharge coefficient of thew orifice; minimum value: 0.60; | |
| 9.81 | = | Gravitatinal acceleration (m/s2); | |
| H1 | = | Vertical distance between the centre of the orifice and the average water level reached upstream of the orifice; the average level corresponds to the average between the maximum level and the level of the centre of the orifice; | |
| H2 | = | Vertical distance between the centre of the orifice and the water level downstream of the orifice (m); if the downstream side of the orifice is not submerged and is free-flowing, then H2=0. |
