Ottawa River Flood Warning Update #7

FLOOD WARNING – Update #7 – OTTAWA RIVER – ARNPRIOR TO HAWKESBURY

May 1, 2019

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

The most recent model outputs from the Ottawa River Regulation Committee (ORRC) indicate that water levels have peaked on Lac Coulonge.  From Chats Lake down to Hawkesbury/Grenville, levels have stabilized but are expected to increase due to forecasted rain of 15 to 35 mm for a large part of the basin starting today.

All flood-prone areas along the Ottawa River from Lac Coulonge down to the Montreal Archipelago are at risk.

Peak water levels across many areas of the Ottawa River will exceed those experienced in May 2017 over the next couple of days.  Levels will remain high and are forecasted to peak between Thursday and Friday.  Risk is highly dependent on the amount of precipitation received.

Area of concern:
Water levels in the Constance Bay area have exceeded those levels reached in May 2017. The ORRC currently forecasts water levels to rise an additional 0.30 m to 0.50 m above the 2017 levels. Updates to this projection will be provided as they become available.

RVCA areas of concern:

Water levels in the Britannia area (Grandview Road, Britannia Village, and the Belltown Community) have exceeded those levels reached in May 2017. The ORRC currently forecasts water levels to rise an additional 0.30 m to 0.50 m above the 2017 levels. Updates to this projection will be provided as they become available.

Water levels east of Cumberland Village (Boise Village, Morin Road, Leo Lane) are equal to those levels reached in May 2017. The ORRC currently forecasts water levels to rise an additional 0.20 m to 0.40 m above the 2017 levels. Updates to this projection will be provided as they become available.

SNC areas of concern:
Water levels in Clarence-Rockland and Alfred-Plantagenet have risen 0.03 m over the last 48 hours.  Levels are forecasted to rise an additional 0.2 m and peak tomorrow, Thursday, May 2. Water levels are expected to be 0.2 m higher than the May 2017 flood.

Due to the forecast uncertainty it is difficult to accurately predict how quickly water levels will rise and when river conditions may peak.

Residents in flood-prone areas are encouraged to closely monitor conditions and take necessary actions. Sandbags are available to residents in flood prone areas.

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 Saturday, May 4, 2019.

The Mississippi Valley Conservation Authority (MVCA) and its Ottawa partners, SNC and RVCA 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

Daily water levels and flows for the Mississippi Valley watershed are available on the MVCA website at http://mvc.on.ca/water-levels/. For more information regarding the Ottawa River, visit www.ottawariver.ca.

The MVCA flood forecasting and warning program monitors weather conditions, snowpack water content, estimates expected river flows and water levels and issues flood advisories or warnings as required. MVCA provides early warning and continuous monitoring to municipal and provincial emergency response personnel through a flood event.

-end-

 

Contact: Gord Mountenay, C.E.T.
Water Management Supervisor
613-253-0006 ext. 233
info@mvc.on.ca   www.mvc.on.ca

Media Inquiries Only:
Shannon Gutoskie
Community Relations Coordinator
613-253-0006 ext. 225
Cell: 705-875-1918
sgutoskie@mvc.on.ca

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