Precipitation this Weekend Expected to Increase Water Levels / Flows across the Rideau Valley Watershed with Possible Flooding in Localized Areas
March 29, 2019 – Since early March, we have experienced a very gradual snow melt with limited precipitation across much of the Rideau Valley Watershed. In the lower Rideau Valley Watershed (North Grenville and Ottawa) and in the Tay Valley Watershed, there still remains above average snow pack which indicates a potential for above average flooding in low lying areas adjacent to any rivers, creeks or ditches.
The current weather forecast indicates that it will remain cool (near freezing) for Saturday and Sunday with a mix of rain, freezing rain, and snow on Saturday. However, there is uncertainty about how much will fall as rain, freezing rain or snow. The current weather forecast also indicates that it will start to warm up next Tuesday with above zero temperatures during the day and night.
Based on the above forecast, water levels and flows are expected increase this weekend in all waterways in the Rideau Valley Watershed. The degree of increase will depend on what type of precipitation occurs. If it’s mostly rain, then flooding could occur in the following areas:
- The smaller creeks and streams in the lower Rideau Valley Watershed. This would include the low-lying roads and waterfront properties adjacent to the Jock River (near Richmond) and Stevens Creek (near North Gower), and any connected creeks or ditches.
- The Long Reach (Burritts Rapids to Manotick) of the Rideau River. In particular, access to Hilly Lane, Cedar Beach, Rideau Glen and other neighourhoods on that reach of the river can be expected to be compromised.
City of Ottawa crews are continuing with their annual ice removal program on the Rideau River between Rideau Falls and Bronson Avenue. City crews are busy with ice breaking activities (for more information: City of Ottawa information at 311).
With the changing levels that can be expected over the coming days, ice cover on lakes, ditches, local streams and rivers will continue to be unstable. Extreme caution should be exercised by everyone when near local waterbodies. Parents should inform their children of the risks and provide appropriate supervision.
As the temperatures continue to warm up, the potential for ice jams still remains high in some local streams and rivers, as flows could quickly increase before the ice can melt. Residents are advised to monitor the river closely as spring progresses for signs of ice jams. RVCA staff will be monitoring conditions but we always welcome any unique observations from watershed residents.
There is also a concern for flooding along roadways due to current snow/ice build up on roadside ditches.
Residents in flood prone or low-lying areas, historically susceptible to flooding, should take the necessary precautions to protect their property, such as:
- Ensuring sump pump is clear, in good working condition and has a backwater valve
- Ensuring easy access to a portable backup generator and pump
- Ensuring downspouts are clear and the outlet is at least 3 metres 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
This watershed conditions statement is in effect until Tuesday April 2, 2019 and will be updated at that time unless the forecast or conditions change.
"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.