High Streamflow Advisory issued for Howe Sound (Squamish, Stawamus, Cheakamus, Lillooet Rivers)

Oct 18, 2017
Affected Communities: 
District of Squamish, Electoral Area D

Update, October 19, 2.40pm: The High Streamflow Advisory has ended


Note from the SLRD: The British Columbia River Forecast Centre has issued a High Streamflow Advisory for parts of B.C., including Howe Sound (impacting the Squamish River, Stawamus River, Cheakamus River and Lillooet River). 

A High Streamflow Advisory means that river levels are rising or expected to rise rapidly, but that no major flooding is expected. Minor flooding in low-lying areas is possible.

 


Full statement from the BC River Forecast Centre

Issued 10:30am, Wednesday, October 18, 2017

The River Forecast Centre is maintaining a Flood Watch for:

  • Kingcome River

The River Forecast Centre is maintaining a High Streamflow Advisory for Vancouver Island and Central Coast including:

  • North Vancouver Island including streams Gold River, Zeballos River, Tahsis, Port Alice and surrounding areas
  • West Vancouver Island including streams in the Tofino, Bamfield and surrounding areas
  • Central Vancouver Island including the Sproat River, Somass River and surrounding areas
  • South Coast including the North Shore Mountains, Howe Sound (Squamish River, Stawamus River, Cheakamus River, Lillooet River), Sunshine Coast and surrounding areas
  • Central Coast including the Bella Coola River and surrounding areas
  • Lower Fraser including the Chilliwack River, Coquihalla River and surrounding areas

A second of a series of storm events is currently passing over coastal British Columbia, and is expected to deliver heavy rain through the region on Wednesday. Current weather forecasts indicate that rainfall amounts from this event are likely to be lower than experienced on Monday-Tuesday across Vancouver Island, but potentially higher amounts on the South Coast, including Howe Sound, North Shore and east along the Fraser Valley. This system is expected to pass quicker than the last storm event, and rainfall is expected to ease by late Wednesday.

River levels have receded since Tuesday but are expected to rise again in response to rainfall on Wednesday. High flows are expected throughout the region on Wednesday and into Thursday in some areas.

While flows on the Kingcome River have currently dropped below flood level, additional rises in levels are expected Wednesday and into Thursday. Current weather forecasts and river modelling is indicating the potential for flows to get back to similar levels that were experienced on Tuesday (up to approximately 7.9 m at the Water Survey of Canada gauge 08GF009 below Atlazi River, or up to approximately 6 m on the ROMCOMM gauge near the village of Gwa-Yee). This outlook is based on similar rainfall amounts occurring Wednesday as was observed on Monday; flows may be higher or lower than this projection depending on how much rain falls.

The River Forecast Centre will continue to monitor conditions and will update this advisory on Wednesday afternoon, or sooner if conditions warrant.

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