This parking redevelopment project totaling 580 parking spaces and 70 bicycle spaces divided into 5 sectors over an area of 4.2 ha is a pioneer in terms of stormwater management. Since the sewer networks in this sector are already operating at capacity and risk being even more stressed during the implementation of the structuring transport network in Quebec, the City took advantage of the redevelopment of this parking lot to integrate water management infrastructures. innovative rainwater systems. This work therefore included the design and construction of bioretention valleys, grass ditches, 1,500 m3 of retention in underground chambers, a 15 m3 rainwater reservoir used to supply the new Public Market, without forget the installation of two hydrodynamic separators and multiple flow regulators to respect the restrictive discharge criterion of 15 L/s/ha. The only treatment the rainwater received was mechanical screening, using pre-filters, upstream of the storage tank. From there, the stored water was then pumped onto a dedicated distribution network (not drinkable), towards uses for watering plants, for merchants.
