Ministry of FLNRO

Flood Warnings and Advisories

High Streamflow Advisory - Cowichan River (MAINTAINED)
ISSUED: November 27, 2017 11:45 AM

The River Forecast Centre is maintaining a High Streamflow Advisory for:

  • Cowichan River

Rain and snowmelt last week has led to high flows on the Cowichan River. Current flows on the Cowichan River at Lake Cowichan (WSC gauge 08HA002) are 230 m3/s (5-year flow), and flows at the Cowichan River near Duncan (WSC 08HA011) are 320 m3/s (between a 2-year and 5-year flow). Flows have eased slightly since yesterday.


Current forecasts from Environment Canada are indicating the potential for 20 mm of rainfall in the Cowichan River watershed late-Monday into Tuesday. Significant rises in river levels are not expected from this rainfall, with streamflow expected to remain around the current rate through Monday and into Tuesday.


The River Forecast Centre will continue to monitor conditions and update this advisory as conditions warrant.


 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.
 A Flood Watch means that river levels are rising and will approach or may exceed bankfull.  Flooding of areas adjacent to affected rivers may occur.
 A Flood Warning means that river levels have exceeded bankfull or will exceed bankfull imminently, and that flooding of areas adjacent to the rivers affected will result.