Conservation Halton advises that the Environment Canada Weather Office has issued a rainfall warning for the area, forecasting between 40 and 70 mm of rain from this afternoon through to late Saturday. Our watershed has received approximately 50mm of precipitation from the rain events earlier this week and soils are saturated. The majority of the watershed creeks are currently running below bankfull conditions, and levels are anticipated to rise this evening and overnight.
With the forecasted rainfall, widespread flooding is not anticipated, however fast flowing water and flooding of low lying areas and natural floodplains is expected. Municipalities, emergency services and individual landowners in flood-prone areas should be on alert. Regular inspection and removal of debris at culverts and drainage inlets is recommended.
With the current high water levels on Lake Ontario, there is a greater potential for erosion and shoreline flooding particularly during periods of high winds and wave action.
All watercourses and shoreline areas should be considered dangerous during this time. Conservation Halton is asking all residents to stay away from watercourses, shorelines and structures such as bridges, culverts and dams. Elevated water levels, fast flowing water, and slippery conditions along stream banks and shorelines make these locations extremely dangerous. Please alert children in your care of these imminent dangers.
Conservation Halton will continue to monitor weather reports and watershed conditions and will issue further messages as necessary.
This Flood Watch will be in effect through to Monday, May 8, 2017.
Update from Ministry of Natural Resources Surface Water Monitoring Centre
At 1:00 p.m. today the Surface Water Monitoring Centre of the MNRF issued a Provincial Flood Watch for Northeast and Southern Ontario, including Lake Ontario. The message indicated the following:
Thursday and Friday’s sustained east-northeasterly winds of 20-30km/h building to 20-45km/h on Lake Erie and Lake Ontario, combined with high water levels on Lake Ontario, may generate storm surge and wave generated erosion on the west end of Lake Ontario for Hamilton, Burlington and Stoney Creek areas.
Lake Ontario water levels are elevated and forecast to reach 1.41m above chart datum for Burlington. Lake Ontario wave heights are forecast to exceed 1.4m in Burlington and surrounding shores.