The City of Laval Facing Combined Sewer Overflows

The City of Laval is currently dealing with a significant combined sewer overflow problem caused by the aging condition of its sewer network and the large volume of stormwater entering the system. Laval’s building stock is also characterized by extensive impervious surfaces that direct rainwater into the sewers, whether through the gutters of numerous single-family homes draining onto poorly absorbent lawns or through large buildings constructed before stormwater retention basins became standard practice.

Serious Consequences That Directly Affect Us

The accumulation of water on land unable to absorb it can lead to serious consequences, including flooding that damages infrastructure and creates financial burdens for residents, the city, and local industries alike.

In addition, sewer overflows carry significant environmental and social costs:

• Impact on recreational activities (such as swimming);
• Impact on water quality;
• Impact on aquatic wildlife;
• Impact on drinking water treatment.

Giving Everyone the Means to Prevent This Problem Sustainably

Reducing impervious surfaces (such as asphalt and concrete) in urban areas and increasing vegetated spaces is essential. These improvements are everyone's responsibility, including both residents and businesses. The implementation of green infrastructures - such as rain gardens, green roofs, and vegetated swales - helps improve soil permeability, reduce the risk of destructive flooding, and mitigate significant impacts on ecosystems.

This project is made possible thanks to :