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Client

Rocky View County

Year

2025

Location

Langdon, Alberta

Diffusers in Langdon Stormwater Pond right after installation. This pond had issues wih duckweed and algae prior to installation.

Project Summary

In Summer 2025, AEC installed a complete turnkey fine-bubble aeration system into a long, narrow stromwater pond in langdon, Alberta. Rocky View County manages this pond as part of its stormwater network and has been dealing with persistent issues, including duckweed overgrowth, algae blooms, heavy muck accumulation, and odours.

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Homes and public walking paths surround the pond, leading to ongoing resident complaints about water quality and aesthetics. The County previously installed a small aerating fountain to improve circulation, but due to the pond's elongated shape, it could not adequately prevent dead zones. AEC designed and instaled a multi-diffuser, fine-bubble aeration system tailored to the pond's geometry and integrated with the existing fountain.

Langdon Stormwater Pond Aeration System

Project Objective & Goals

  • Provide a low-maintenenace and budget-friendly solution to improve dissolved oxygen levels throughout the pond to reduce duckweed, algae, muck buildup and odours.

  • Deliver a low-noise, non-intrusive installation suitable for a residential setting.

Methods 

  • Designed a multi-diffuser finhe-bubble aeration layout optimized for long, narrow water bodies.

  • Integrated a new aeration infrastructure with the County's existing aerating fountain for complementary circulation and aeration.

  • Deploy six Can-Air SS diffusers with nearly 1500 ft of airline using an aluminum boat.

  • Install two Pond Pro CA-series 1/2 HP rocking piston compressors.

    • Total system HP = 1​

    • Total airflow at 0 psi = 13.60 cfm

  • Carefully trench an insulated airline from the point of the compressors into the pond to allow for seamless year-round operation.

  • Coordinated closely with County staff to minimize disruption to homes and pedestrians near the pond.

Challenges 

  • This pond was highly problematic, with duckweed, algae, and odour issues, requiring a comprehensive aeration approach.

    • Pond shape (long and narrow) created persistant dead spots that surface fountains could not address alone.​

  • Very vocal residential community, requring extra care, cleanliness, and discretion during installation.

  • Unexpected pond drainage the day before mobilization, reducing water depth from the expected 6-8 ft to only a few ft.

Timeline

Design and Quotation: Spring 2025

Inmstallation and Integration: Summer 2025

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Planned Solutions 

To address the pond's complex issues, AEC:

  • Designed a system that uses more diffusers than normal for the surface area of this pond, as we had to factor in the shape of this pond to prevent anaerobic zones.

  • Provide a quiet, low-profile system respectful of surrounding homes.

  • Despite the low water levels when our team arrived, the system was installed as planned.

  • In some areas, the water was so shallow that the boat had to be manually paddled or pulled to get to the premarked diffuser location.

  • The system's performance was not affected, as water levels rose, efficiency improved.

Results 

  • The COunty reports that the aeration system is working well since installation and some residents have even called the County office to compliment their system.

  • Odour complaints have dropped, and water circulation has noticeably imporved.

  • Rocky View County has since purchased bioaugmentation products from AEC to reduce muck accumulation further.

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