Conservation Lac Brome

Brome Lake, the natural gem of our region, is bearing the brunt of climate change. 

Temperature variations and extreme precipitation have direct impacts on the water quality and ecosystem of the lake. But let’s not give up: by acting on the factors we can control, we can mitigate these effects and protect the health of our lake and its recreational uses. 

Downpours and Heatwaves 

Temperature changes directly influence the health of Brome Lake. Think of the early heatwaves last June when temperatures were 10°C above normal. Hotter summers lead to an increase in the lake’s water temperature, which was measured at 26.2°C at the beginning of July compared to a maximum of 24.4°C measured in 2023. Warm waters promote the proliferation of aquatic plants and algae, including blue- green algae. These algae, when multiplying, consume the oxygen essential to aquatic fauna and flora and can release toxins, limiting the recreational uses of the water body.

Extreme precipitation exacerbates the problem. Heavy rains, like those brought by post-tropical storm Beryl causing some parts of the Eastern Townships to receive double the normal rainfall, increase surface water runoff, carrying nutrients like phosphorus. In large quantities, phosphorus overfeeds aquatic plants and algae and accelerates the aging of the lake.

Let’s Take Action

We cannot control downpours or heatwaves, but fortunately we, the citizens, municipalities, institutions, businesses, and industries, have the power to act on certain factors to avoid worsening the situation. Here are some simple yet effective actions:

– The top priority, the one with the most impact on the lake: vegetate the shoreline and ditches. This vegetation acts as a natural filter, retaining nutrients that would otherwise go directly to the lake, thus increasing algae proliferation.

– Create ecological surfaces: Unlike impermeable surfaces, ecological or vegetated pavers in driveways and green arrangements like rain gardens allow water to infiltrate the soil rather than run off.

– Respect motorized navigation zones that reduce the impact of oversized waves on the shores and the lake bed sediments that contain large amounts of phosphorus.

By adopting these simple actions, we can all contribute to the protection of Brome Lake and its watershed. My lake, I take care of it and above all, I preserve !