The Rockwell Drive Flood Recovery project addresses the impacts of the catastrophic “atmospheric river” event in November 2021, which caused widespread washouts and damage along Rockwell Drive. Site DF1, located at 6535 Rockwell Drive, was among the hardest-hit locations, experiencing significant erosion and structural damage to public infrastructure and private property. In response, Binnie was retained by the MOTT to conduct emergency response efforts, provide emergency response recommendations, and design long-term recovery solutions tailored to the unique challenges of the site.

The existing road right-of-way is extremely limited, with a large rock outcrop on the uphill side, and private property on the downstream side. Rockwell Drive currently provides the only access to many private residences, Sasquatch Provincial Park, and industrial users. Providing a solution that maintained traffic in one direction at all times while accommodating site constraints was exceptionally challenging.

With the site constraints, our design team selected a concrete box culvert to maximize resistance to bed load abrasion; however, a traditional installation method of crane or excavator was deemed impractical due to the limited staging space and the weight of the precast culvert pieces. The design team reviewed the staging in detail and developed a unique solution—a cast-in-place box culvert with a custom trash rack. This allowed for sequential staging and we designed temporary retaining walls to maintain traffic flow. These measures were further complemented by close coordination with stakeholders to provide designs compatible with downstream drainage systems and community needs.

This recovery effort demonstrates Binnie’s expertise in addressing complex infrastructure challenges in flood-prone areas and highlights our commitment to protecting public safety while enhancing regional climate resiliency.

The Rockwell Drive Flood Recovery project at Site DF1 was designed to address critical risks and enhance resilience against future extreme weather events. The project team conducted detailed field assessments to understand site-specific challenges, including erosion, debris flow, and culvert blockages. Hydrologic modelling and geotechnical analysis informed the development of targeted solutions.

Key features included upsizing the existing culvert to a concrete box culvert capable of managing peak flows of 9.7 m³/s; installing a trash rack to mitigate sediment and debris blockages; and regrading ditches with Jersey barriers to manage potential stream avulsions to prevent future washouts. Binnie’s design team also engaged with local property owners since the culvert discharges into private property.

Minimizing traffic disruptions to residents was a priority during construction. Construction staging and careful coordination with property owners allowed for a smooth construction process. The project maintained traffic flow along Rockwell Drive without major disruptions. Environmental considerations, such as sustainable materials and erosion control measures, further enhanced the project’s impact while minimizing environmental impact.

By addressing immediate risks and fortifying infrastructure resilience to climate change, this approach enhances long-term safety with uninterrupted access for residents, businesses, and emergency services.

The Rockwell Drive Flood Recovery project significantly enhanced flood resilience and community safety. The new concrete box culvert manages peak flows of 9.7 m³/s, preventing washouts and ensuring consistent drainage. Erosion control measures and debris flow mitigation have reduced risks to public and private property. These upgrades showcase Binnie’s commitment to practical, effective solutions that protect infrastructure and improve safety.