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

Section 50 Disposition versions

2020-12-31

50. Failing the use of a computer model, the runoff flow to be treated to reduce suspended matters and that drains to a storm water management work whose design is based on a runoff flow is established using equation 3-15:

Equation 3-15: Qquality = (0.65 × i2years × 0.9 × Aimp)/360

where:

	Qquality	=	Runoff flow to be treated (m3/s);
	0.65	=	Rainfall level adjustment factor;
	i2years	=	Rain intensity having a 2-year return period based on the rainfall intensity-duration-frequency values for a duration that may not exceed the concentration time of the territory draining to a storm water management work (mm/h);
	0.9	=	Associated runoff coefficient;
	Aimp	=	Sum of impervious surfaces drained to the storm water management work, including surfaces drained indirectly (ha);
	360	=	Conversion coefficient for the units.

O.C. 871-2020, s. 50.

Not in force

In force: 2020-12-31

50. Failing the use of a computer model, the runoff flow to be treated to reduce suspended matters and that drains to a storm water management work whose design is based on a runoff flow is established using equation 3-15:

Equation 3-15: Qquality = (0.65 × i2years × 0.9 × Aimp)/360

where:

	Qquality	=	Runoff flow to be treated (m3/s);
	0.65	=	Rainfall level adjustment factor;
	i2years	=	Rain intensity having a 2-year return period based on the rainfall intensity-duration-frequency values for a duration that may not exceed the concentration time of the territory draining to a storm water management work (mm/h);
	0.9	=	Associated runoff coefficient;
	Aimp	=	Sum of impervious surfaces drained to the storm water management work, including surfaces drained indirectly (ha);
	360	=	Conversion coefficient for the units.

O.C. 871-2020, s. 50.