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TRCA Flood Management Service

Flood Management Service

A principal mandate of the TRCA is to reduce the risk to life and damage to property caused by flooding. We do this by providing local agencies and the public with notice, information and advice so that they can respond during severe rainfall events with the potential for flooding, and during flood related emergencies. The TRCA's Flood Management Service (FMS) has been developed in order to prepare and respond to our changing environment, the increasing needs of our municipal partners and the health and well being of our living city.

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Real-time Gauging Website Are You Prepared? Who To Call?

Flood Management Bulletin Board

December 21, 2015

Wrapping up our year!

The TRCA Engineering Services team was restructured to accommodate the multi-disciplinary groups who are involved with water resources management within the GTA. These specialists are experienced, trained and professional Engineers of Ontario who provide expertise in the area of Water Resources Engineering, Hydrology, Hydrometrics and Flood Risk Management.

The Contrivers

Water Resources Engineers specialize in Flood Modelling and Mapping, Remediation studies, Stormwater and Low Impact development strategies.

  • Reviewed Over 1000 Development Applications
  • Completed complex 2S Modelling Projects such as Spring Creek 2D Modelling
  • Special Policy Area reviews such as Lake Wilcox SPA


Our Flood Risk Management Team focuses on emergency management planning, public outreach, media, public relations, flood remediation and EA coordination.

  • Issued 11 Flood Warning Messages to advise of weather conditions and flood concerns
  • Organized the Annual Provincial Flood Forecasting and Warning Workshop
  • Social Media Campaign integration
  • 98% of Flood Duty Officers are trained in Emergency Management. 

The Framework

Flood Infrastructure and Hydrometrics develops and maintains our Real Time Gauging Site, Flood Vulnerable database, Watershed Monitoring, Flood Control Structure maintenance (Dams, Channels, Etc), Long term Infrastructure planning and Install/Operate Stream /Precip gauges.

  • Installed 35 Precip Gauges (9 in Real Time)
  • Installed 36 Stream Gauges (16 in Real Time)
  • Plan on installing an additional 13 Steam Gauges and 1 new Precip Gauge in 2016

The Science

Hydrogeology handles development reviews, EA reviews, Groundwater Modeling, Source Water Protection and Groundwater Studies.

  • The approval of the Toronto and Region Source Water Protection Plan

Together the entire department works together to manage the effects of water around our urban watersheds. 

October 14, 2014

Remembering Hurricane Hazel 60 Years Later

On October 15, 1954 the storm of the century struck southern Ontario. The Flood Management Service has created this infographic to share some Hurricane Hazel facts and compare more recent flood events such as July 8, 2013 and August 19, 2005 to Hurricane Hazel. 


Click here to view the infographic PDF


April 7, 2014

OPP Inspector offers flood safety tips

From the desk of Caledon OPP Inspector Tim Melanson  

Environment Canada is forecasting warmer weather and showers over the next couple of days and weeks.  Due to the ice storm and large amount of snowfall in the Caledon area, I wish to provide you with safety tips as flooding in certain areas is imminent.  Local streams and waterways will become dangerous, especially in the vicinity of culverts and bridges. The forecasted rainfall and warm temperatures in the next week may result in the partial melting of the snow and can result in increased stream flows.

  • Remind children to keep away from all bodies of water, regardless of depth. 
  • Do not walk through moving water.  As little as 6 inches of moving water can make you fall.
  • If you are in a car, do not drive through flood waters or underpasses.  The water may be deeper than it looks and your car could get stuck or swept away by fast water.
  • Be aware of areas where floodwaters have receded, roads may have weakened.
  • Stay away from downed power lines, and report them to the power company.
  • Pay attention to local radio and keep up to date with changing weather information.
  • Flash floods can occur within minutes or hours of excessive rainfall.
  • Know the difference between a flood watch and a flood warning.  A watch means flooding is possible.  A warning means flooding is occurring or will occur soon.
  • Be prepared, build an emergency kit which includes, water, food, can opener, flashlight and batteries, battery operated radio, first aid kit, medications and cash.

The OPP reminds all members of the public to be aware of their personal safety at all times. The OPP's website,, contains a number of useful resources, tips and links.


August 28, 2013
"Flooding Happens; it's only a matter of time!"

Mike Walters, Source Water Protection Manager, Integrated Watershed Management Director, Conservation Ontario

It's been less than two months since severe flooding devastated Calgary and much of southern Alberta and closer to home disrupted the lives of tens of thousands of Toronto area residents, stranding motorists and leaving homes without power. For most people who were not significantly affected, these events are already fading and becoming a distant memory. However, for those who lost loved ones, homes and their possession the loss and suffering continues as they try to return their lives to some semblance of normalcy.

These catastrophic events remind us of what could happen to countless people that continue to live within floodplains throughout Canada.


August 12, 2013
Toronto Storm Infographic: July 8, 2013

The Flood Management Service created an infographic to help visualize the impact of the July 8th storm and how it ranked compared to other storm events.

View the infographic PDF

View the Infographic JPG

July 8 Infographic




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