With access ways to the waterfront properties on the Long Reach of the Rideau River (Kars to Burritts Rapids) again passable, the Flood Warning, in place for the last week, is now reduced to Flood Watch. 

Rain forecast for Saturday evening into Sunday is expected to cause an upturn in flows in the Rideau system. However, flows are expected to have receded sufficiently by then that the increase will have a minor impact. The expectation is that flows, as measured at the recording station at Carleton University, will increase to about 280 cubic metres per second (cms) by early Monday. This is well below the peak flow reached on April 8 (456 cms) and below flows that would cause flooding to happen again.

The Rideau Canal reservoir lakes are all at their full supply level and measures are being taken to bring those levels down within the normal operating ranges for each of the four lakes. However, releases from each of the lakes has to be done to minimize the impacts downstream. Wolfe Lake has to be brought down in concert with Upper Rideau Lake and, in turn, Upper Rideau levels have to be managed within the limits of Big Rideau and Newboro Lakes. Releases from Bobs Lake have to be done with regard for levels on Christie Lake, flows in Perth and flows into Big Rideau and outflow from Big Rideau Lake has to be done with regard for levels on the Long Reach.

While flows are declining and temperatures are warming, it is still risky to be around waterbodies. The water is still relatively high, fast moving and cold so parents need to educate their children about the dangers

The Flood Watch will remain in effect through the weekend. Conservation Authority staff will continue to monitor conditions and will issue updates as warranted.

Water levels have been dropping throughout the Rideau watershed since Saturday but not all flooded areas are fully dry yet. Water levels have dropped about 22 centimetres since the Saturday peak on the Long Reach between Burritts Rapids and Manotick. Another 34 centimetres are left to go on Hilly Lane and similar amounts on the neighbouring waterfront communities near Kemptville. Until those communities have safe access restored, the Flood Warning will remain in effect.

The decline in levels in the Long Reach will be slowed by rain forecast for tomorrow and by water that has to be released from Big Rideau Lake to alleviate high water conditions on the Rideau Canal reservoir lakes. The release of water will be synchronized as much as possible with the movement of water through the Long Reach to avoid causing levels there to increase again.

Flood waters in and near Windsor Park and in Brantwood Park in Ottawa South and East have receded as have waters in the Richmond area on the Jock River.

It continues to be important for parents to advise their children of the dangers of cold and, in places, fast moving springtime waters. Everyone needs to be cautious.

Conservation Authority staff will continue to monitor conditions and will issue updates as warranted.

Runoff from the rain event on Thursday is working its way through the system leaving several waterfront communities still without access to their properties.

Water levels have been holding more or less steady for the last few hours. A definite peak has not yet been reached but can be expected today. Cooler temperatures overnight have slowed the runoff process. Temperatures of over 10 degrees forecast for today will cause much of the remaining snow and ice to melt and run off today which will keep levels up for the short term.

Once a definite decline of levels begins, Parks Canada staff will need to begin releasing water from the reservoir lakes upstream of Smiths Falls to relieve high levels on the lakes. Every effort will be made to keep the release close to the rate of decline on the Long Reach between Burritts Rapids and Manotick to avoid increasing water levels again in the communities first hit on Thursday.

Water levels on the Jock River rose through Friday causing some properties in and around Richmond to have access issues and their sump pumps running. Flooding in Ottawa South adjacent to and in Windsor Park and in Ottawa East in Brantwood Park has closed the streets and park pathway.

Weather forecasts call for 10 millimetres of rain on Tuesday and continued warm daytime temperatures. The warm temperatures will continue to take the frost out of the soil and melt the last stubborn snow and ice in sheltered areas. The rain is likely to slow the rate of recession of water levels for a brief time.

As with all of these messages, we want to emphasize the need for caution near the cold and, in some places, fast moving water. Parents need to make their children aware of the danger.

Conservation Authority staff will continue to monitor conditions and will issue updates as warranted.

Heavy rain on Thursday has caused streamflows and lake levels to increase significantly in the Rideau River watershed.

The amount of rain that fell in eastern Ontario wasn’t quite as much as forecast but it is certainly having an impact. Such water levels were last reached in 2014. The worst impact is in North Grenville and rural Ottawa near the confluence of Kemptville Creek with the Rideau River.
Some street and pathway flooding is occurring in Ottawa South adjacent to and in Windsor Park and in Ottawa East in Brantwood Park. No residential flooding in urban Ottawa has been reported to the RVCA.

With only light rain showers still in the forecast and runoff has been working its way through the system, the rate of increase of water levels has begun to slow down. Peak flow can be expected to occur tonight or early Saturday at about 450 cubic metres per second as measured at the monitoring station at Carleton University.

The recession will continue through the weekend. However, there may be a reversal on Monday as Parks Canada staff release water held in the Rideau Canal reservoir lakes that has been held back to provide some peak flow attenuation. This influx of water is expected to slow the recession briefly.

Everyone, especially children, are advised to stay away from the fast flowing and cold water in watershed streams. Also, there may still be ice on some more sheltered lakes that can be expected to be highly unstable and should be avoided.

Conservation Authority staff will continue to monitor conditions and will issue updates as warranted.

Rain presently falling is causing flows in the Rideau River to increase toward thresholds at which flooding can be expected to cause access issues to lower lying waterfront properties.

The area first affected will be the Long Reach of the Rideau between Kars and Kemptville. In particular, access to Hilly Lane, Cedar Beach, Rideau Glen and other neighbourhoods on that reach of the river can be expected to be compromised as the rain enters the system today. Rain forecast in the order of fifty-five millimetres (mm) on Thursday and Friday can be expected to be followed by a peak on Saturday in excess of 450 cubic metres per second (cms) on the Rideau River measured at the monitoring station at Carleton University. To compare, the historical average flow at the Carleton gauge is 320 cms.

Such flows in the system can also be expected to put water on the end of Belmont Avenue, on Rideau River Drive and into Windsor Park in Ottawa South by Friday.

Finally, be safe! Ensure that children stay away from cold, fast flowing rivers and streams.

Conservation Authority staff will continue to monitor conditions and issue further statements as conditions warrant.

Rain presently falling is causing flows in the Rideau River to increase toward thresholds at which flooding can be expected to cause access issues to lower lying waterfront properties.

The area first affected will be the Long Reach of the Rideau between Kars and Kemptville. In particular, access to Hilly Lane, Cedar Beach, Rideau Glen and other neighbourhoods on that reach of the river can be expected to be compromised as the rain enters the system today. Rain forecast in the order of fifty-five millimetres (mm) on Thursday and Friday can be expected to be followed by a peak on Saturday in excess of 450 cubic metres per second (cms) on the Rideau River measured at the monitoring station at Carleton University. To compare, the historical average flow at the Carleton gauge is 320 cms.

Such flows in the system can also be expected to put water on the end of Belmont Avenue, on Rideau River Drive and into Windsor Park in Ottawa South by Friday.

Finally, be safe! Ensure that children stay away from cold, fast flowing rivers and streams.

Conservation Authority staff will continue to monitor conditions and issue further statements as conditions warrant.