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Science breathing new life into Island lake, and it's kind of working

  • The Capital Regional District reported that oxygen is being introduced into Saanich Lake through a diffuser to combat deep-water oxygen depletion, improving deep-water oxygen levels and shortening the anoxia period to two months last year, according to a June 25 report.
  • The oxygenation system was installed in late 2023 and was commissioned in March 2024, with a maintenance cost of $165,000 in 2024, and anticipated costs rising to $175,000 in 2025.
  • Deep-Water phosphorus levels decreased by 80% compared to previous years, despite blue-green algae blooms persisting in 2024 due to ideal growth conditions.
  • The findings stress the importance of addressing nutrient sources impacting lake health, as noted in the Elk/Beaver Lake Watershed Management Plan.
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Lake Cowichan Gazette broke the news in on Saturday, July 5, 2025.
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