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

Section 47 Disposition versions

2020-12-31

47. To determine the suspended matter reduction performance of storm water management works installed in parallel, equation 3-13 must be used. Note that no reduction performance is recognized for a pretreatment work unless such a work is listed in Table 3.17.

Equation 3-13:

where:

	P	=	Suspended matter reduction performance of n storm water management works installed in parallel (%); minimum value of 80%;
	Qi	=	Flow passing through the work i (m3/s);
	ri	=	Suspended matter reduction performance of storm water management work I determined in accordance with Table 3.17 (%);

Table 3.17 Suspended matter reduction performance

Storm water management work	Suspended matter reduction performance
Dry retention system	40 to 60%: performance established in accordance with subdivision 2 of Division I of Chapter IV
Permanent volume retention system	50 to 90%: performance established in accordance with subdivision 2 of Division II of Chapter IV
Grassed ditch	50% or performance established in section 146
Hydrodynamic separator	Variable: performance established in accordance with Division IV of Chapter IV
Commercial storm water traetment technology	50% or 80%: performance established in accordance with Division V of Chapter IV

O.C. 871-2020, s. 47.

Not in force

In force: 2020-12-31

47. To determine the suspended matter reduction performance of storm water management works installed in parallel, equation 3-13 must be used. Note that no reduction performance is recognized for a pretreatment work unless such a work is listed in Table 3.17.

Equation 3-13:

where:

	P	=	Suspended matter reduction performance of n storm water management works installed in parallel (%); minimum value of 80%;
	Qi	=	Flow passing through the work i (m3/s);
	ri	=	Suspended matter reduction performance of storm water management work I determined in accordance with Table 3.17 (%);

Table 3.17 Suspended matter reduction performance

Storm water management work	Suspended matter reduction performance
Dry retention system	40 to 60%: performance established in accordance with subdivision 2 of Division I of Chapter IV
Permanent volume retention system	50 to 90%: performance established in accordance with subdivision 2 of Division II of Chapter IV
Grassed ditch	50% or performance established in section 146
Hydrodynamic separator	Variable: performance established in accordance with Division IV of Chapter IV
Commercial storm water traetment technology	50% or 80%: performance established in accordance with Division V of Chapter IV

O.C. 871-2020, s. 47.