Thaw and Rain Expected to Produce Minor Runoff (flood bulletin, January 10-13, 2018)
Watershed Conditions Statement – Water Safety (Issued January 10, 2018 at 3:00 pm; Valid until January 13, 2018)
Ten to 15 mm of rain are forecast for today through Friday morning; air temperatures are forecast to increase this afternoon, and to remain at between 6-8 °C, before dropping below zero on Friday morning. Snowpack water equivalent (the depth of water contained in the snow pack), is estimated between 40 and 50 mm across the watershed, with fairly uniform distribution.
The forecast warm temperatures, combined with rain, are expected to produce minor runoff across the watershed. No serious flooding is anticipated at this time. Peak flows are expected to occur starting Friday and continuing into the weekend in downstream areas. Water levels will remain elevated over the weekend.
Temperatures are forecast to return to below freezing on Friday, to return to the negative double digits by Saturday morning, and to remain below freezing for the rest of next week.
Municipal staff should monitor local drainage problem areas where snow and ice may have covered catch basins. Smaller rural watercourses may have been drifted in by snow which, during a runoff event, can block flows and back up water onto adjacent lands, resulting in localized flooding problems.
Residents are reminded to use extreme caution near all watercourses, and keep children and pets away. Ice is unstable and thin, streambanks are slippery and the water is very cold.
The UTRCA’s flood control reservoirs at Fanshawe, Wildwood and Pittock Conservation Areas are at seasonal levels. UTRCA officials are monitoring the situation, and will report on any changing conditions if necessary.
Contact: Eleanor Heagy, Communications Specialist