Flood Warnings and Advisories
Flood Warning – Vancouver Island (West & South)
ISSUED: 10:00 AM February 1, 2020
The River Forecast Centre is upgrading a Flood Warning for:
- Western Vancouver Island
- Southern Vancouver Island
The River Forecast Centre is upgrading to a Flood Watch for:
- Eastern Vancouver Island
Very heavy rainfall fell over Vancouver Island on Friday due to an atmospheric river. Temperatures increased considerably due to the sub-tropical source of the atmospheric river. The warmer temperatures created a rain-on snow event for many rivers on Vancouver Island.
A summary of some rivers in Western Vancouver Island and Southern Vancouver Island that are now under Flood Warning include:
- San Juan River near Port Renfrew (08HA010) peaked above 1300 m3/s at 1AM and was near a 100-yr flow. It is gradually receding.
- Koksilah River at Cowichan Station (08HA003) reached 371 m3/s at 4am - between 50 and 100-yr flow. It is beginning to recede.
- Cowichan River near Duncan (08HA011) is near 570 m3/s and nearing its peak. This is between a 20 and 50-yr flow.
- Chemainus River near Westholme (08HA001) peaked at 3am with a flow above 700 m3/s - near a 50-yr flow. Flows are beginning to recede.
- Nanaimo River near Cassidy (08HB034) is leveling off around 890 m3/s - near a 10-yr flow.
A summary of some of the rivers in Eastern Vancouver Island under Flood Watch include:
- Englishman River near Parksville (08HB002) peaked at 4am at 522m3/s - slightly above a 10-yr flow. Flows are beginning to recede.
- Little Qualicum River near Qualicum Beach (08HB029) is flowing at 220m3/s which is slightly above a 20 year flow.
The rainfall has ended and flows are expected to gradually recede through the rest of the weekend. There will a slower recession in rivers with lake sources like the Cowichan River.
The public is advised to stay clear of the fast-flowing rivers and potentially unstable riverbanks during the high-river-level period.
The River Forecast Centre will continue to monitor and provide updates as conditions warrant.
Contact for Media Relations, Ministry of Forests, Lands, Natural Resource Operations and Rural Development:
Tel: 250 356-7506
Levels of Warnings/Advisories:
- High Streamflow Advisory: River levels are rising or expected to rise rapidly, but that no major flooding is expected. Minor flooding in low-lying areas is possible. This is the lowest level.
- Flood Watch: River levels are rising and will approach or may exceed bankfull. Flooding of areas adjacent to affected rivers may occur. This is the intermediate level.
- Flood Warning: River levels have exceeded bankfull or will exceed bankfull imminently, and that flooding of areas adjacent to the rivers affected will result. This is the highest level.
- Home of River Forecast Centre
- Current Streamflow Conditions and Flood Forecast Modeling
- Map of Current Streamflow Return Periods for All WSC Stations
- CLEVER Model 10-day Forecasts of Discharges and Return Periods
- COFFEE Model 5-day Forecasts of Discharges and Return Periods
- Back to page of Flood Warnings and Advisories