Snow Melt Progressing (flood bulletin, February 17-20, 2022)
FLOOD WATCH
Issued February 17, 2022 at 1:30 pm; Valid until February 20, 2022
The winter storm currently affecting the Upper Thames River Basin produced 20-40 mm of rain since last evening, with slightly higher amounts in the northern portion of the watershed. Temperatures overnight were in the single digits above zero before dropping to near freezing temperatures late this morning. This combination of rain and warm temperatures initiated the snow melt process.
Streams are rising due to the resulting runoff and will continue to rise throughout the day. The Upper Thames River Conservation Authority (UTRCA) expects flows in upstream areas of the watershed (Mitchell, Woodstock) to peak later this afternoon. These peaks will move downstream through the river system over this evening. Flows in the London area are expected to peak near midnight tonight.
The UTRCA does not expect serious flooding at this time, but water may spill over the banks in areas known to traditionally flood. Water levels will remain elevated into the weekend.
Municipal staff are asked to monitor potential drainage problem areas where snow may have covered catch basins. Smaller rural watercourses have been drifted in by snow which can block flows during a runoff event, backing up water onto adjacent lands and causing localized flooding.
The UTRCA’s flood control reservoirs at Fanshawe, Wildwood, and Pittock Conservation Areas are at seasonal levels and are being operated to reduce any downstream flooding. UTRCA officials are monitoring the situation and will report on any changing conditions if necessary.
The public is reminded to exercise extreme caution and stay off all frozen water bodies. Any ice cover will be weakened and unstable. Flood control reservoirs will be especially hazardous due to fluctuating water levels. Banks adjacent to rivers and creeks are very slippery and, when combined with cold, fast-moving water, pose a serious hazard. Parents are encouraged to keep children and pets away from all watercourses and off of frozen water bodies.