Project Overview
The Howden Road West Culvert Replacement project involved the complete replacement of an aging corrugated steel pipe arch culvert located beneath a key municipal roadway. The existing structure—measuring 3100 × 1980 mm—had reached the end of its service life and required full removal and replacement with a larger and more durable 3730 × 2290 mm structural plate corrugated steel arch culvert.
Q Engineering was retained to provide specialized engineering support for the temporary works required during construction—including flow diversion, dewatering, and erosion and sediment control (ESC). Our mandate was to deliver effective, compliant, and permit-ready designs to ensure uninterrupted water flow, environmental protection, and safe construction execution.
Project Challenges
The project site is located adjacent to a natural watercourse, requiring meticulous planning to:
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Maintain uninterrupted water flow during culvert replacement
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Prevent environmental impact downstream
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Ensure worker and public safety
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Provide a clear plan that meets municipal and environmental regulations
Because the main structural design was already provided by the client, Q Engineering’s primary focus was the temporary works design required to execute the replacement safely and efficiently.
Our Scope of Work
Q Engineering provided complete, stamped engineering drawings and calculations for:
1. Temporary Flow Diversion System
To maintain creek flow during excavation and culvert replacement, our team designed a safe and efficient bypass system including:
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Temporary channel routing (conceptual and functional design)
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Pump-around and dewatering options
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Flow capacity assessment
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Upstream & downstream cofferdams
This ensured the contractor could keep the waterway active without disrupting construction operations.
2. Dewatering Plan
The project required excavation below the water table.
Our dewatering design included:
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Pump placement and sizing
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Discharge location and filtration requirements
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Construction-safe working zones
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Environmental protection considerations
This plan helped maintain dry conditions for safe culvert installation.
3. Erosion & Sediment Control (ESC) Measures
The municipality requested enhanced ESC protection during construction.
Our ESC design incorporated:
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High-duty silt fence (wood stake) on both sides of the work zone
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Inlet and outlet stabilization using clay seal and granular materials
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Sediment barriers around excavation areas
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Vegetation and brush management
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Protection of adjacent private entrances and road embankments
These measures ensured environmental compliance and protected nearby properties.
4. Quality Control & Stamping
Once the temporary work plans were completed, Q Engineering performed a final quality-control review and delivered:
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A complete, stamped set of working drawings
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ESC layout plan
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Flow diversion plan
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Dewatering instructions
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Construction sequencing recommendations
This package gave the contractor everything needed for safe and compliant execution.
Engineering Outcomes
Our engineering solutions allowed the project team to:
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Replace the aging culvert safely and efficiently
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Maintain uninterrupted water flow through the bypass system
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Protect the creek and surrounding natural features
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Meet all municipal permit, environmental, and construction requirements
The final plans ensured smooth construction phasing and minimized disruption for both the contractor and the community.
Looking for Support on Your Next Municipal or Transportation Project?
Whether you need temporary works, culvert design, ESC planning, shoring solutions, or municipal permit-ready engineering packages, Q Engineering is here to help.
📞 (289) 819-3999
📧 info@qengineering.ca