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

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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);
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.
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);
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.