Update #1: Flood Risk Continued Due to Elevated Water Levels and Flow

(WCS – R05/2025)

Friday, March 21, 2025 - The Rideau Valley’s watershed-wide Flood Watch has been extended to March 26 as water levels and flows remain elevated in vulnerable areas.

Increased flows from the upper watershed may be contributing to higher water levels across the watershed, with localized flooding possible in low-lying areas. Ice jam risks could also cause localized flooding as ice cover continues to break up.

Residents should continue to be cautious around all waterbodies and to take extra precautions if they live in a flood-vulnerable area.

This Flood Watch statement is in effect until March 26, 2025 at 11:59 pm or until an update has been issued.

MORE DETAILS:

Weather Forecast: Environment and Climate Change Canada is forecasting above-freezing temperatures from March 21 to 26 and some light rain on March 22 to 23.

Environmental Conditions: Water levels and flows across the Rideau Valley Watershed are in a moderate to elevated state due to the ongoing freshet. The ground is currently saturated, reducing its ability to absorb additional rainfall or melt. The water levels and flows in the upper watershed region are also elevated and have yet to fully stabilize.

Risks: The entire watershed remains under a flood watch, with the following risks present:

• Water levels and flows are anticipated to stay elevated in areas that are currently at peak levels due to the ongoing freshet conditions.
• With elevated water levels and flows throughout the Rideau Watershed and saturated soils, the increased flows from the upper watershed will remain highly sensitive to additional rainfall or melt.
• Where still present, the ice cover is anticipated to weaken and break apart, posing a potential risk of ice jamming.
• Rising water levels and faster flows will continue to create hazardous conditions near lakes, rivers, and streams. Watercourses remain unsafe for recreational activities, and the remaining shifting ice may pose risks to infrastructure.

Location-Specific Considerations: Given the noted risk above, the Rideau systems and its tributaries are at an increased risk of localized flooding.

Residents in the City of Ottawa can check flood risks in their area using our Neighbourhood Flood Maps. If your property is within the RVCA watershed, use our Map your property tool to assess potential flooding impacts. Current water levels and stream flow with flood onset limits can also be consulted on our Interactive Map.

Action & Safety Recommendations: Residents in flood-prone areas are advised to closely monitor water levels and flows and take the necessary precautions to protect their property, such as:

• Ensuring sump pumps are clear, in good working condition, and have a backwater valve.
• Keeping a portable backup generator and pump easily accessible.
• Ensuring downspouts are clear and directing water at least 3 m away from the dwelling.
• Securing items that might float away as flows increase.
• Removing valuable items from basements or lower floors that could be subject to flooding.
• Keeping emergency phone numbers handy.
• Familiarizing yourself with your municipality’s Emergency Preparedness Plan.

Residents are reminded that a Water Safety Statement is in effect until April 15th and advised to exercise caution when near rivers, streams, and other waterbodies due to the risks described above. Parents should inform their children of these dangers and provide appropriate supervision.

Duration: This Flood Watch statement is in effect until March 26, 2025 at 11:59 pm or until an update has been issued.

RVCA monitors water levels and weather forecasts as part of its Flood Forecasting and Warning Program. Updates will be provided as conditions change.

Water Safety – High flows, unstable banks, melting ice or other factors that could be dangerous for recreational users such as anglers, canoeists, hikers, children, pets, etc. Flooding is not expected.

Flood Outlook – Early notice of the potential for flooding based on weather forecasts, calling for heavy rain, snow melt, high winds or other conditions that could lead to high runoff, cause ice jams and/or lakeshore flooding or erosion.

Flood Warning – Flooding is imminent or already occurring in specific watercourses or municipalities.

Flood Watch – Flooding is possible in specific watercourses or municipalities. Municipalities, emergency services and individuals in flood prone areas should prepare.