Boundary Dam Spillway Upgrade
Boundary Dam Reservoir serves as a source of cooling water for the Boundary Dam Power Station, SaskPower’s largest generating station. KGS Group was retained to perform a dam safety assessment of the Boundary Dam structures.
The dam safety review identified a number of concerns, the most critical of which were insufficient spillway capacity and deficiencies with the condition of the existing spillway. Our team was then retained to design spillway upgrades to extend the life of the 50+ year old structure and to double the discharge capacity of the spillway. We performed preliminary and final design for complete replacement of the spillway chute and basin, while maintaining the reservoir at full supply level. The work also included the installation of over 400, +30-metre-long anchors.
The team overcame complex foundation issues with bentonite seams, coal layers and high groundwater. Another critical site challenge was to design and complete each year’s construction such that the spillway could potentially pass spring flood flows. Despite many challenges, the project was completed on schedule and near budget.
Project Highlights
- Dam safety assessment, spillway upgrade design, construction support
- Complete replacement of spillway chute and basin while maintaining full supply level
- Discharge capacity doubled to improve flood performance and safety
- Installation of 400+ anchors, each over 30 metres in length
- Foundation treatment addressing bentonite seams, coal layers and high groundwater
