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Bonnybrook Wastewater Treatment Plant - Plant D Expansion Flood Protection

Working with the City to develop and implement a flood protection plan to protect an essential wastewater treatment plant

  • Calgary, Alberta

    Calgary, Alberta

Protecting Calgary’s critical infrastructure

Causing extensive damage to public and private infrastructure alike, the 2013 flood was a momentous event in Alberta’s history. A critical piece of municipal infrastructure, the Bonnybrook Wastewater Treatment Plant (WWTP), was damaged in three significant ways: overland flows from the river, flooding due to surcharging of the sewer system, and high groundwater levels. To address each of the sources of site flooding, we developed a number of flood mitigation measures which were completed as a component of the Bonnybrook WWTP Plant D Expansion project.

The first of these measures features an 830-metre long and 3.5-metre high earth flood berm along the east boundary of the Bonnybrook WWTP site to prevent overland flows from the river. Addressing the flooding caused by surcharging of the sewer system, we relocated multiple storm sewer pipes, removing an existing storm outfall and re-routing trunk sewers. To prevent the back-up of river water levels through the WWTP outfall, the existing treated effluent bank outfall was relocated approximately 650 meters downstream. The final measure our team developed was a groundwater dewatering system, including a groundwater dewatering pipe, to reduce the impacts of high groundwater levels on existing structures and the site as a whole.

No longer vulnerable to neighboring Bow River, the Bonnybrook WWTP can continue to provide necessary services for years to come.

At a Glance

CEA Awards, Project Management, Award of Excellence & Water Resources, Award of Excellence, 2024
Meet Our Team

Saibal Basu, Principal, Water/Wastewater Treatment Team Lead

Listen to clients from the start and keep communication as a top priority—no matter what.
Saibal Basu Principal, Water/Wastewater Treatment Team Lead Read More

James Bigelow, Associate, Senior Hydrotechnical Engineer

As people, we are naturally connected to water—it’s our duty to design with both the natural habitat and community resiliency in mind.
James Bigelow Associate, Senior Hydrotechnical Engineer Read More

Daniel McLellan, Associate, Geotechnical Engineer

Flipping your perspective to consider clients’ problems is key to building effective solutions.
Daniel McLellan Associate, Geotechnical Engineer Read More

Ryan Roberts, Executive Vice President, Water

I believe project success is achieved through open, honest communication and a clear understanding of client expectations and deliverables.
Ryan Roberts Executive Vice President, Water Read More

Matt Wood, Principal

I help build flood resilient communities by restoring rivers and riparian areas, designing riverine infrastructure, and flood mitigations.

Lacey AuCoin, Senior Associate, Environmental Planner

I work closely with clients and regulators to integrate the environmental mitigation strategies that meet project objectives.
Lacey AuCoin Senior Associate, Environmental Planner Read More

David Alberti, Principal, Hydrogeologist

Quality work from the beginning leads to better outcomes and decisions in the end.

Saibal Basu

Principal, Water/Wastewater Treatment Team Lead

James Bigelow

Associate, Senior Hydrotechnical Engineer

Daniel McLellan

Associate, Geotechnical Engineer

Ryan Roberts

Executive Vice President, Water

Matt Wood


Lacey AuCoin

Senior Associate, Environmental Planner

David Alberti

Principal, Hydrogeologist

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