PROJECT SUMMARY

The Calgary Zoo was severely impacted by the historical June 2013 floods in southern Alberta. Located primarily on St. George’s Island, a 32 acre body of land in the middle of the Bow River, the Zoo was inundated with 1 to 2 m of water. Total damages approximated $50 million. The flood mitigation consists of bank armouring, earth berms, a sheet pile installed below and above ground around St. George’s Island, and a dewatering system to manage stormwater and groundwater. These measures will protect the zoo against water levels up to 1 m above the 2013 flood, and 0.5 m above the 1:100-year flood elevation.

OUR ROLE

Matrix acted as the prime consultant immediately after the flood – we were responsible for design, regulatory approvals, construction specifications, contractor selection, and directing construction of the bank repairs. For the conceptual flood mitigation options we brought additional engineering consultants onto the design team, and for the detailed flood mitigation component, we were responsible for river engineering design of the sheet pile wall and berms, regulatory approvals, environmental assessments, and directing instream construction. 

CHALLENGES

Bank repairs were designed, permitted, and constructed within 3 months. In several locations, due to space constraints, it was necessary to construct the flood protection wall within the floodway. We assessed river hydraulics and demonstrated that these encroachments had no negative impact on flood levels.

OUTCOME

The zoo was able to partially reopen within 3 months and the flood risk for the area has been greatly reduced. Bank repairs and flood protection designs integrated fish habitat features, allowing for timely regulatory approval of instream works without the need for a separate and costly project. This project received an Award of Merit from the Consulting Engineers of Alberta.

We routinely lead characterization of stream morphology to:

  • Assess fluvial erosion hazards
  • Develop alternatives for erosion control in environmental assessments
  • Develop management strategies as part of land use planning (subwatershed, secondary, tertiary plans and site plans)
  • Assist in culvert/bridge design
  • Define erosion thresholds to inform stormwater management

Learn about some of the interesting projects Matrix’s team of environmental consultants and engineers get to be a part of.

Got a specific question about a project or opportunity?

Use this form or the email address below to drop us a line and we’ll make sure it gets sent to the appropriate Matrix team.

General inquiries

Use the email below to contact our reception mailbox

Join the Matrix Team

We’re always looking for great people who share our values.

I hereby accept the terms and agreement