The Official Site of The City of Markham
Pilot Project for Algae Control (Pond ID #91)
The City of Markham is working on a pilot project to control the growth of algae in stormwater pond #91. This pond is located at the southwest corner of Edward Jeffreys Avenue and Golden Meadows Drive.
Some residents of Markham who live near these ponds sometimes worry about the presence of algae in the water. They do not like how it looks and are sometimes concerned that it might harm their health. Algae growth is common in ponds, especially during hot and dry summers. This happens because the water in the ponds contains nutrients that help the algae to grow.
To ensure that ponds are working properly, Markham carries out an annual inspection and maintenance program. Minor issues are resolved each year, while major problems that could affect the pond's performance may require cleaning and improvement.
Since there have been regular complaints about algae levels in some of Markham ponds, the City is testing out projects such as this one for its ‘toolbox’ of management approaches. This pilot project involves using an ultrasonic device connected to a solar panel. The panel is fenced off for safety and protection.
The ultrasonic device uses sound waves to control the growth of algae. It is relatively low-cost and long-lasting and is often used for drinking water reservoirs. The device makes it difficult for algae to float, causing it to sink to the bottom of the pond. In lower light levels, the algae become deactivated. The ultrasound waves are low-powered and do not affect aquatic animals, birds, or humans.
More information about stormwater ponds management in Markham can be found at Stormwater Management Facilities Maintenance (markham.ca).
If you have any questions or observations during the operation of the device (throughout the summer and fall), please contact the following:
Zahra Parhizgari,
Senior Environmental Engineer
905.477.7000, Extension 2867
zparhizgari@markham.ca
Should a problem arise after regular working hours or on the weekend, please call the City’s after-hour service at 905.477.7000.
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