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Recent Rainfall Could Delay Use of Pumps to Keep Cowichan River Flowing

Recent rainfall increased lake water levels by about 5.4 cm, delaying pump use needed to maintain river flow, with ongoing coordination among regulators and stakeholders.

  • On Aug. 19, Brian Houle said recent rain slowed Lake Cowichan's level drop, reducing immediate pressure to start pumping.
  • Measurements show the lake fell 5.1 cm instead of the expected 10.5 cm, meaning rainfall added about 5.4 cm to lake storage.
  • Discussions on Aug. 19 resulted in an agreement to hold the weir flow at 4.5 cubic metres per second, and weekly meetings will continue to monitor conditions in the coming weeks.
  • The rain provided about eight days of water, moving the expected need for pumps further into September from the original Sept. 15 timing.
  • Officials will decide before Sept. 15 whether to deploy pumps, with Brian Houle cautioning the forecast 'next two weeks' shows little rain despite eventual substantial rainfall and weekly meetings continuing.
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Lake Cowichan Gazette broke the news in on Wednesday, August 20, 2025.
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