Q-2, r. 9.01 - Design code of a storm water management system eligible for a declaration of compliance

Section 105 Disposition versions

2020-12-31

105. The sizing of the flow control device for the reduction of suspended matters, in the case of an orifice or orifice plate type, is established using equation 4-7:

Equation 4-7

where:

	A	=	Flow section of the orifice (m2);
	Q̅ mes	=	Average outlet flow of the dry retention system to discharge the runoff volume to be treated (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; 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.

O.C. 871-2020, s. 105.

Not in force

In force: 2020-12-31

105. The sizing of the flow control device for the reduction of suspended matters, in the case of an orifice or orifice plate type, is established using equation 4-7:

Equation 4-7

where:

	A	=	Flow section of the orifice (m2);
	Q̅ mes	=	Average outlet flow of the dry retention system to discharge the runoff volume to be treated (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; 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.

O.C. 871-2020, s. 105.