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

Section 52 Disposition versions

2020-12-31

52. Where the design of a storm water management system includes the use of plants, the plants chosen must be adapted to the hydrological zone indicated in Table 3.18.

The hydrological zones correspond to those listed in Table 3.19.

Table 3.18 Hydrological zones

Storm water management work	Hydrological zone
	1	2	3	4	5
Dry retention system			X	X	X
Permanent volume retention system	X	X	X	X	X
Grassed ditch			X	X	X

Table 3.19 Description of hydrological zones

Zone	Description	Hydrological conditions
1	Permanent deep water	• Permanent presence of water;
		• Water depth > 0.5 m;
		• Aquatic plants appropriate for the greatest depths.
2	Permanent shallow water	• Permanent presence of water;
		• Water depth from 0.15 to 0.5 m.
3	Retention zone	• Exposed zone between 2 rain events, but regularly flooded;
		• For a dry retention system and a grassed ditch, the zone corresponds to the zone between the bottom and the water level reached following the passage of the erosion control rain defined in section 76;
		• For a permanent volume retention system, the zone corresponds to the permanent volume water level in the water and sediment accumulation zone and the level reached by the water following the passage of the erosion control rain defined in section 76.
4	Riparian border	• Occasionally flooded during events having 2-year and 100-year return period.
5	Outside strip	• Rarely or never flooded;
		• Developed areas for environmental and aesthetic aspects and to control access to the storm water management work.

O.C. 871-2020, s. 52.

Not in force

In force: 2020-12-31

52. Where the design of a storm water management system includes the use of plants, the plants chosen must be adapted to the hydrological zone indicated in Table 3.18.

The hydrological zones correspond to those listed in Table 3.19.

Table 3.18 Hydrological zones

Storm water management work	Hydrological zone
	1	2	3	4	5
Dry retention system			X	X	X
Permanent volume retention system	X	X	X	X	X
Grassed ditch			X	X	X

Table 3.19 Description of hydrological zones

Zone	Description	Hydrological conditions
1	Permanent deep water	• Permanent presence of water;
		• Water depth > 0.5 m;
		• Aquatic plants appropriate for the greatest depths.
2	Permanent shallow water	• Permanent presence of water;
		• Water depth from 0.15 to 0.5 m.
3	Retention zone	• Exposed zone between 2 rain events, but regularly flooded;
		• For a dry retention system and a grassed ditch, the zone corresponds to the zone between the bottom and the water level reached following the passage of the erosion control rain defined in section 76;
		• For a permanent volume retention system, the zone corresponds to the permanent volume water level in the water and sediment accumulation zone and the level reached by the water following the passage of the erosion control rain defined in section 76.
4	Riparian border	• Occasionally flooded during events having 2-year and 100-year return period.
5	Outside strip	• Rarely or never flooded;
		• Developed areas for environmental and aesthetic aspects and to control access to the storm water management work.

O.C. 871-2020, s. 52.