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

Section 5 Disposition versions

2020-12-31

5. A dry retention system that also reduces the concentration in suspended matters must include a pretreatment work that meets the requirements of sections 56 to 59 and a microbasin that meets the requirements of sections 71 to 75.

A pretreatment work is not required if

(1)  the storm water comes from a territory whose dominant use class is residential and is served by a local road with the characteristics indicated in Table 2.1

Table 2.1 Local roads in rural or urban areas

Characteristics	Rural	Urban
Traffic	Traffic movement secondary consideration	Traffic movement secondary consideration
Land access	Primary function	Primary function
Traffic volume	< 1,000 vehicles per day	< 3,000 vehicles per day
Traffic flow	Interrupted flow	Interrupted flow
Design speed	50 to 80 km/h	30 to 50 km/h
Average running speed (uninterrupted flow)	50 to 70 km/h	20 to 40 km/h
Vehicle type	Mainly automobiles, light to medium trucks and occasional heavy trucks and farm vehicles	Mainly automobiles and service vehicles
Normal connections	Locals and collectors	Locals and collectors

(2)  the sum of the impervious surface drained to the dry retention system does not exceed 250 m2.

O.C. 871-2020, s. 5.

Not in force

In force: 2020-12-31

5. A dry retention system that also reduces the concentration in suspended matters must include a pretreatment work that meets the requirements of sections 56 to 59 and a microbasin that meets the requirements of sections 71 to 75.

A pretreatment work is not required if

(1)  the storm water comes from a territory whose dominant use class is residential and is served by a local road with the characteristics indicated in Table 2.1

Table 2.1 Local roads in rural or urban areas

Characteristics	Rural	Urban
Traffic	Traffic movement secondary consideration	Traffic movement secondary consideration
Land access	Primary function	Primary function
Traffic volume	< 1,000 vehicles per day	< 3,000 vehicles per day
Traffic flow	Interrupted flow	Interrupted flow
Design speed	50 to 80 km/h	30 to 50 km/h
Average running speed (uninterrupted flow)	50 to 70 km/h	20 to 40 km/h
Vehicle type	Mainly automobiles, light to medium trucks and occasional heavy trucks and farm vehicles	Mainly automobiles and service vehicles
Normal connections	Locals and collectors	Locals and collectors

(2)  the sum of the impervious surface drained to the dry retention system does not exceed 250 m2.

O.C. 871-2020, s. 5.