Ivy Lea Club

Ivy Lea, Ontario, Canada.

Stormwater Management

ASC Environmental designed a comprehensive stormwater management system for the proposed boat storage facility at 14 Flaggs Creek Crescent.

Given the site’s unique makeup—a 2.25-hectare area built on 5 metres of compacted granite rock fill—we developed an approach that turned the entire subgrade into a natural infiltration basin. This allowed the majority of stormwater to soak into the ground rather than run off into nearby water bodies. Roof and driveway runoff was directed into off-line infiltration trenches alongside each building, lined with geotextile to help filter out debris before it reaches the ground.

Our flow modeling confirmed that even during severe 1:100-year storms, peak runoff from the site remains unchanged from existing levels. Most importantly, the system achieves over 80% removal of suspended solids, protecting the water quality of nearby Flagg’s Creek, and was designed for low maintenance, with routine inspections being the only requirement.

Hydrogeological Assessment

As part of the same project, ASC Environmental conducted an Environmental Impact Study (EIS) for the Ivy Lea Club to ensure the development would not compromise the area’s rich natural features.

Our team visited the site multiple times over several months, carefully mapping sensitive areas such as the Provincially Significant Wetland, an Area of Natural and Scientific Interest (ANSI), and local woodland driplines.

We identified wildlife habitats, including those of species at risk like the endangered butternut tree and whip‑poor‑will, and made sure the development steered clear of these zones.

Our surveys documented a wide range of species and habitat types, with special attention to breeding birds and amphibians. All findings were compiled into a clearly illustrated report with user-friendly maps and practical guidelines, ensuring the design remained fully compliant with environmental regulations while minimizing the project’s ecological footprint.

Highlights

Designed a natural, low-maintenance stormwater system using rock fill and infiltration trenches
Identified and mapped sensitive habitats including wetlands, woodlands, and species at risk
Delivered clear, regulation-compliant plans for both drainage and environmental protection

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Impact

Reduced runoff and improved water quality before reaching Flagg’s Creek
Preserved habitats for endangered and threatened species
Enabled responsible development without disrupting the surrounding ecosystem

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Results

Natural Buffers Protected: All sensitive areas like the Provincially Significant Wetland, ANSI, and woodland driplines were mapped and respected in the site layout.
Species at Risk Accounted For: A young butternut tree (endangered) and whip‑poor‑wills (threatened) were identified, with habitats left undisturbed.
Achieved over 80% removal of suspended solids
Maintained pre-development peak flows during major storms.
Protected all key natural features and met all regulatory requirements

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