Update: this story has been updated from its original version to include more current forecasts.
The Ottawa River Regulation Planning Board issued a statement on Apr. 14 forecasting a rapid increase in river levels from Pembroke to Montreal due to the heavy rainfall that began Sunday evening.
“Water levels and flows are increasing rapidly at all locations along the main stem of the Ottawa River due to recent rainfall combined with significant snowmelt from the unregulated portion of the basin,” the statement reads.
“Minor flood levels may be exceeded in flood prone areas along the Ottawa River between Pembroke and Masson/Cumberland over the next few days.”
The planning board defines the minor flood level as the level at which “parts of some streets, lawns and parks are beginning to flood, with no or few houses/buildings being affected.”
An Apr. 13 press release from the planning board offers a more detailed explanation as to the rise in water levels expected this week.
“Over the next five days, warmer temperatures are expected to cause rapid snowmelt in the southern
part of the basin where snow remains (e.g. Petawawa River), as well as increased snowmelt in subbasins north of the Ottawa River (e.g. Coulonge and Rouge rivers),” it says.
“Combined with forecast rainfall of 30 to 60 mm over the next few days across the basin, water levels and flows are expected to rise significantly and may exceed flood levels in many locations later this week.”
The Pembroke district of Ontario’s Ministry of Natural Resources also issued a flood warning on Apr. 14, in effect from Pembroke to Arnprior until Apr. 17, unless otherwise updated.
It warns water levels “may exceed flood levels in flood prone locations later this week,” and advises residents that have been affected by high water levels in the past to secure vulnerable property near rivers and lakes and monitor conditions throughout the week.
More detailed information and up-to-date forecasts are available via www.ottawariver.ca.
