As climate change brings more frequent and intense storms, cities across Quebec are seeking sustainable solutions to prevent their sewer systems from being overwhelmed. One solution is gaining traction: sponge parks.

These green spaces are designed to temporarily absorb rainwater, reducing runoff into underground infrastructure.

Unlike paved surfaces that direct water straight into sewers, sponge parks allow water to slowly infiltrate the ground, helping to prevent flooding.

In Montreal, Mayor Valérie Plante has committed to creating 30 sponge parks and 400 sponge sidewalks by the end of 2025.

So far, 13 parks are already operational, including Howard Park in Villeray, which can retain 676,000 liters of water, and Pierre-Dansereau Park in Outremont, with a capacity of 627,000 liters. Fourteen more projects are underway, and 18 are in the design phase.

Laval is also making strides, with around 30 sponge parks already completed.

The next one will be built in the Vimont neighborhood, where a vacant lot will be transformed to temporarily hold rainwater during heavy downpours.

Longueuil highlights that this concept isn’t new. The city’s Parc de la Cité, developed over 25 years ago, is a prime example. Its retention basin, which resembles a lake, plays a crucial role during periods of heavy rain.

These initiatives show that green infrastructure is not only a tool for climate adaptation but also a lever for sustainable urban planning.

In addition to their technical function, sponge parks provide recreational spaces, support biodiversity, and beautify neighborhoods