The official website of the City of London300 Dufferin Avenue519-661-CITY (2489)3-1-1 (within London)

What is the City Doing to Fix/Prevent Basement Flooding?

The City of London takes a number of steps to reduce the risk of basement flooding.  Each year a number of construction projects take place within the City to upgrade road systems and underground infrastructure.  This may include installing/upgrading curb and gutters, installing storm sewers in areas where they weren’t previously available, cleaning or re-grading ditches, to name a few.

Two men preparing to flush the sewers.  The City also takes part in a number of maintenance programs such as flushing the sewers, videoing the sewers, and monitoring the sewers.

Sewer Flushing

The City of London has large trucks that force water through a section of sewer to remove blockages or debris that build up in the sewer over time.  Each year the City flushes to keep the sewer system running smoothly and prevent blockages that may cause a back-up in your basement. Each year the City flushes over 1000 km of pipe.


A sewer camera is about to be inserted into the sewer to monitor for blockages or defectsSewer Videos

The City of London has a program where the sewers in the City are videoed.  A camera is attached to a wheel mounted unit and remotely sent down the sewer to take video of the inside of the sewer pipes.  City staff then reviews the sewer video and notes any debris, tree roots, blockages, or cracks in the pipe. If problems are found, the proper maintenance is scheduled to rectify the situation.  Ongoing video analysis helps the City identify and rectify any potential problems before you have a back-up in your basement.  The City videos approximately 125 km of sewer each year.




Flow Monitoring

The City of London has a number of sensors installed in sewers throughout the City.  These sensors record the amount of flow in the City sewers.  This data is analyzed by City staff to see what level the flow is at during wet weather events, such as a rainstorm, as well as during dry weather situations.  Staff can then determine if there is an irregular amount of flow in a sewer.  If an abnormality is found, staff will investigate further.  This is a very beneficial way for the City to get real life data; instead of just relying on theoretical design.

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