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Q-2, r. 9.01 - Design code of a storm water management system eligible for a declaration of compliance
Section 103
Disposition versions
103. The dry retention system must have a flow control device for the reduction of suspended matters that ensures a retention period of the runoff volume to be treated of at least 12 hours.
If a flow control device of the orifice or orifice-plate type is used, the diameter may not be less than 75 mm. In that case a value of 40% must be used as suspended matter removal performance.
Where a flow control device is added to the dry retention system in accordance with the first paragraph, the device provided for in subparagraph 1 of the first paragraph of section 94 becomes optional.
In force: 2020-12-31
103. The dry retention system must have a flow control device for the reduction of suspended matters that ensures a retention period of the runoff volume to be treated of at least 12 hours.
If a flow control device of the orifice or orifice-plate type is used, the diameter may not be less than 75 mm. In that case a value of 40% must be used as suspended matter removal performance.
Where a flow control device is added to the dry retention system in accordance with the first paragraph, the device provided for in subparagraph 1 of the first paragraph of section 94 becomes optional.
