The Aberdeen Lake Dam, an earthen dam originally constructed in approximately 1908 and previously modified in 1964, required extensive repairs and modifications to ensure its long-term safety and operational efficiency. This project was undertaken for the Regional District of North Okanagan. The scope involved a partial removal and replacement of the existing earthen dam structure, replacement of the low-level outlet pipe, and the installation of a new vertical gate, accompanied by a new gate chamber and access shaft. A critical design parameter was the requirement for all modifications to support a potential future 5-meter rise in the reservoir’s water level.

My Role and Key Contributions

As a Structural Designer on this project, I was instrumental in designing several key components of the new water conveyance and control system. My primary focus was on delivering robust, durable, and practical structural solutions for a complex system. This system encompassed an upstream intake chamber, a 20-meter long access tunnel, a downstream outlet chamber, a customized energy dissipator, and an inlet wall structure featuring a flap valve.

My specific design contributions included:

  • Structural Design for Water Conveyance System:

    • I engineered the overall structural concept and performance specifications for the pre-cast concrete tunnel and valve chambers, which were designed to house the new pipe assembly. (The detailed design of the pre-cast concrete elements was executed by a specialized manufacturer, with my design ensuring seamless integration).
    • I designed the concrete pipe supports and anchorages, ensuring they could safely withstand all anticipated operational and environmental pipe loading conditions.
    • I developed the structural design for concrete pedestals intended to support the new gate valve assembly.

  • Access and Support Structures:

    • I designed an elevated steel platform and its associated supports within the new structures, with a focus on ensuring safe and efficient operator access.
    • I also engineered various other critical equipment supports necessary for the functionality of the new dam components.

  • Key Design Considerations and Solutions:

    • My structural designs meticulously addressed the significant space constraints present within both the new and existing interconnected structures.
    • A high priority in my design of the tunnel and chamber layouts was the ease of use for operators, enhancing both functionality and safety.
    • I ensured the durability of submerged structural members through careful material selection and design detailing, accounting for anticipated installation stresses and long-term maintenance conditions.
    • All my structural designs inherently accounted for relevant loading conditions, including seismic event loads, to ensure structural integrity and resilience.
    • A core aspect of my design work was ensuring all components were compatible with provisions for a future 5m increase in reservoir water level, aligning with the project’s strategic long-term requirements.

  • Deliverables:

    • I produced comprehensive structural calculations and detailed analyses for all components under my responsibility.
    • I prepared precise design drawings and technical specifications for these structural elements.
    • My work was integral to compiling the design documents for the project tender process, ensuring clarity, accuracy, and completeness for prospective contractors.

This project allowed me to leverage my expertise in developing practical and resilient structural designs for critical water infrastructure, successfully navigating complex site-specific challenges and stringent operational requirements.