Skip to main content

Allnorth was engaged by Graham Infrastructure LP – Calgary (Graham) to complete a structural design for a semi-temporary concrete isolation wall and steel gate, both located in a water channel at the Bonnybrook Wastewater Treatment Plant in Calgary, AB.

The revamp of the semi-temporary steel wall aimed to serve a dual purpose: to hold back water on one side while simultaneously acting as formwork for a concrete wall on the opposite side. This complex design had to account for withstanding a water load of 0.8 metres as well as a concrete load of 4 metres in elevation.

Furthermore, Allnorth was approached to develop the structural design for a permanent, inversed T-shaped concrete retaining wall, alongside a concrete mud slab for high sulphate (HS) crack control in storm culverts. Within this scope, the structural engineering team designed two slabs. The first was a crack-controlled slab, positioned at the west wall, while the second took the form of a mud slab, positioned at the east wall.

Throughout the construction phase, Allnorth’s structural engineering team was available on-site to ensure the accurate execution of the design.


  • Structural Engineering Design and Drafting
  • Structural Engineering Calculations
  • Project Management
  • IFC Drawing Package
  • Construction Support 
  • Field Review


Calgary, AB

Find an office near you

With locations across Canada and into the US and Mexico, Allnorth prides itself on being responsive to client needs and to providing leading-edge methodologies, technologies and protocols. Having a local presence helps us build strong relationships, and working cross functionally throughout the company helps us leverage the strengths of our entire team to deliver successful client solutions. Contact us today for more information as to how we can work together for you.

Learn More