May 10, 2019 — Rideau Valley Conservation Authority (RVCA), in conjunction with the Mississippi Valley Conservation Authority (MVCA) and South Nation Conservation (SNC) is maintaining the FLOOD WARNING issued on April 19, 2019 for the areas under our jurisdiction along the Ottawa River.

The most recent analysis from the Ottawa River Regulation Committee (ORRC) indicate that water levels along the Ottawa River from Mattawa to Montreal are increasing due to recent precipitation and increased flow from the upper part of the watershed.  Water levels are not expected to reach the levels observed last week over the forecasted period.

All flood-prone areas along the Ottawa River from Lac Coulonge down to the Montreal Archipelago are at risk as snowmelt continues along the upper Ottawa River. Levels are expected to remain high for the next two to three weeks. Risk is highly dependent on the amount of precipitation that is received. Residents are strongly urged to keep sandbags in place for now. Updates to all projections will be provided as they become available.

MVCA areas of concern: 

Water levels in the Constance Bay area are expected to increase over the next 24 to 48 hours but are expected to be 5 to 10 cm lower than last week’s peak elevations.

RVCA areas of concern:

Water levels in the Britannia area (Grandview Road, Britannia Village, and the Belltown Community) are expected to increase over the next 24 to 48 hours but are expected to be 5 to 10 cm lower than last week’s peak elevations.

Water levels east of Cumberland Village (Boise Village, Morin Road, Leo Lane) are expected to increase over the next 24 to 48 hours but are not expected to exceed the peak levels observed last week.

SNC areas of concern:

Water level in Clarence-Rockland and Alfred-Plantagenet have risen 0.04m in the last 48 hours. Levels are expected to increase over the next 24 to 48 hours but are not expected to exceed the peak levels observed last week.

Residents in flood-prone areas are encouraged to closely follow evolving conditions and to take necessary measures. Residents are advised to stay away from watercourses where flows are high and where banks might be unstable. Parents are encouraged to explain dangers to children.

This FLOOD WARNING is in effect until Tuesday, May 14, 2019 at 5:00 PM.

RVCA and its Ottawa partners, MVCA and SNC monitor the water levels and weather forecasts with the Ministry of Natural Resources and Forestry as part of the Flood Forecasting and Warning Program. Updates are provided as conditions change.

The Ottawa River Regulation Planning Board will be reassessing forecast conditions and providing hydrological condition updates on its website daily at www.ottawariver.ca/forecast.php.

To view current flood warnings across Ontario, visit https://www.ontario.ca/law-and-safety/flood-forecasting-and-warning-program.”

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"Rideau Valley Conservation Authority is a partnership of municipalities within the Rideau Valley watershed created under the Conservation Authorities Act to deliver a range of programs in watershed management and natural resource conservation."

RVCA Watershed Conditions Statements:

• 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 Watch – Flooding is possible in specific watercourses or municipalities. Municipalities, emergency services and individuals in flood-prone areas should prepare.
• Flood Warning – Flooding is imminent or already occurring in area watercourses.