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Q-2, r. 9.01 - Design code of a storm water management system eligible for a declaration of compliance
Section 21
Disposition versions
21. To determine the runoff peak flow of a territory or the storage volume of a storm water management work, the rational method or computer model complying with the standards established in subdivision 4 of Division II of Chapter III must be used.
The rational method described in subdivision 2 of Division II of Chapter III allows the estimating of the runoff peak flow of a territory having an area less than 25 km2 for storm water management works whose design criterion is the runoff flow.
The rational method described in subdivision 3 of Division II of Chapter III allows the estimating of the storage volume of a storm water management work whose design criterion is the runoff volume receiving storm water from a territory having a maximum area of 5 ha.
Every hydrological and hydraulic calculation provided for in this Regulation may be carried out using a computer model if the standards established in subdivision 4 of Division II of Chapter III are complied with.
For the purposes of this Regulation,
(1) the grassed ditch, the hydrodynamic separators and the commercial storm water treatment technologies are storm management works whose design criterion is the runoff flow; and
(2) the dry retention system and the permanent volume retention system are storm management works whose design criterion is the runoff volume.
In force: 2020-12-31
21. To determine the runoff peak flow of a territory or the storage volume of a storm water management work, the rational method or computer model complying with the standards established in subdivision 4 of Division II of Chapter III must be used.
The rational method described in subdivision 2 of Division II of Chapter III allows the estimating of the runoff peak flow of a territory having an area less than 25 km2 for storm water management works whose design criterion is the runoff flow.
The rational method described in subdivision 3 of Division II of Chapter III allows the estimating of the storage volume of a storm water management work whose design criterion is the runoff volume receiving storm water from a territory having a maximum area of 5 ha.
Every hydrological and hydraulic calculation provided for in this Regulation may be carried out using a computer model if the standards established in subdivision 4 of Division II of Chapter III are complied with.
For the purposes of this Regulation,
(1) the grassed ditch, the hydrodynamic separators and the commercial storm water treatment technologies are storm management works whose design criterion is the runoff flow; and
(2) the dry retention system and the permanent volume retention system are storm management works whose design criterion is the runoff volume.
