102. The suspended matter reduction performance of the dry retention system is established in accordance with figure 4.2; it is between 40% and 60% depending on the retention period.
The retention period corresponds to the time elapsed between the time the water of the dry retention system reaches a maximum level and the time when there is less than 10% of the volume in the system.Figure 4.2 Suspended matter reduction performance of a dry retention system according to the retention period
871-2020O.C. 871-2020, s. 102.