Three-Layer Retention System Eases Overflows in Canadian City

The city of Rosemère, Quebec, Canada, has problems with sewer overflows during large rain events. Over the past few years, the city implemented many storm water projects to help resolve these problems. One such project is the three-layer retention StormChamber system. This configuration temporarily is stocking storm water in the corner of William and Sewing streets. 

The system had to sustain long-term heavy loadings. A portion of land is situated under a parking lot for school buses, and the only land available to place the storm water system was a relatively small parcel of land. This large-scale retention of 30,547 cu ft had to be placed in a footprint of only 4,844 sq ft. The city appointed the firm BHP to develop a solution.

In order to store this volume of retention in a restricted space, Soleno, a Quebec distributor of HydroLogice Solutions and the StormChamber manufacturer, helped BHP design a three-layer StormChamber retention system more than 13-ft deep and with a sealed PEHD membrane welded on field. The proposed system fit within the limits of land assigned in width, length and depth. The retention solution with the triple-stacked StormChamber system represented an economical and fast installation option, considering the restricted space. The construction of the system was conducted by Charles Maisonneuve Companies Ltée in three weeks.