Why isn’t the City xing my drainage problem?
Protect your home and possessions by
Drainage standards have changed over the years. understanding what causes basement ooding.
On private property, renovating to meet current
drainage standards is the responsibility of the
Protect Your Basement
homeowner, similar to bringing a home’s electrical
and plumbing systems up-to-date. Where large scale Basement ooding is a serious problem that a ects City sewer systems:
neighbourhood ooding problems exist, the City has
residents in many municipalities, including the
undertaken multi-million dollar projects to reduce the Sanitary (wastewater) sewer – The sanitary sewer
City of London. Basement oodings generally occur receives wastewater from toilets, bathtubs, sinks,
severity of basement oodings.
during snow melts and heavy rainfall and can cause and laundry machines through your home pipes.
In many circumstances, only improvements completed serious damage and inconvenience. There are two The sanitary sewer is located under the street and is
on private property will reduce the chance of ooding. systems involved in basement ooding: connected to the nearest sewage treatment plant.
These types of improvements must be undertaken
Storm (rainwater) sewer – The storm sewer is
privately by the homeowner. 1. Overloaded home drainage systems located under the street and carries surface water
from lawns and streets, and groundwater from
How much is this going to cost?
2. Overloaded City sewer systems
weeping tiles and foundation drains, through pipes
to local streams.
Each situation will be di erent. You should contact
a master plumber to assess the potential cause of
ooding and provide a cost estimate. While repairs
on private property are the responsibility of the RT
INE Home drainage system:
homeowner, the City of London o ers a subsidy to ep
ing ion D
Weeping tile/foundation drains – Weeping tiles
qualifying homeowners to improve home drainage Fo
n er) are pipes with drainage holes located underground
tc hB or
systems. Please refer to the city’s Basement Flooding Ca
around the basement foundation to prevent
Subsidy Program pamphlet for more details. ildi
groundwater from entering the basement. Weeping
S rm tiles should be connected to the sump pit, however,
Ho m H
in older homes they may be connected to the sanitary
rai ar y
w n to
e D on nit lan
v at c t i Sa tP
sewer or storm sewer.
er S e
to help homeowners
For more information, or to obtain a copy of the Tre
on M a
Basement Flooding Subsidy Program pamphlet: a in
er Downspouts – Typically, downspouts carry rainwater
identify causes of
ew or from your roof directly onto the ground surface. In
• Phone 519 661-2500 Ext. 2334; n ib
Sa ns older homes, downspouts may be connected to your
• Visit City Hall, 8th Floor, basement ooding Ci t
y weeping tiles or directly to the storm sewer.
300 Du erin Avenue, London; or Sump pit/pump – A sump pit is dug into your
• View our website, www.london.ca and enter
and improve drainage basement oor and collects natural groundwater from
the weeping tiles. The sump pump moves the water
“Basement Flooding” into the Search eld.
conditions. from the sump pit to the ground surface or to the
Working together – Home drainage and
Back ow preventor (full-port) - A back ow
City sewer systems
preventor is a device that prevents sewage from
No municipal drainage system can guarantee every backing up into your basement from the City’s
house complete protection against basement oods. sanitary sewer. The back ow valve automatically
closes if sewage backs up from the sanitary sewer.
Working together, we can help prevent ooding and Regular cleaning of the Back ow preventors is the
Environmental & Engineering Environmental & Engineering reduce costly upgrades to City systems. responsibility of the homeowner.
Services Department Services Department
BasementFlood_Brochure3.indd 1 2/13/09 5:10:25 PM
There are a variety of causes of basement ooding.
What is causing my ooding? The following cases describe a number of common ooding situations that can occur in London homes.
Poor lot grading through cracks
Groundwater or window
Floor drain Weeping tile Floor drain
not working or
City sanitary sewer
tile tile Sump
Service connection Sump pump Service connection
to sanitary sewer (not operating)
Service connection to sanitary sewer
A B Exterior foundation drain system
C to sanitary sewer
Weeping Tiles and/or Downspouts Malfunctioning Sump Pump Surface Water Causing City Sanitary Sewer Pipe Full
Connected to the Sanitary Sewer If your home is equipped with a sump pump,
If the City’s sanitary sewer pipe is full due
During heavy rainfall, the water entering the it may have malfunctioned – causing your Basement ooding can occur when there is to large amounts of rainwater from various
downspouts may cause the weeping tiles to over ow. basement to ood. water ponding around your foundation walls sources – such as private weeping tiles or from
If your weeping tiles are connected to the sanitary and/or your weeping tiles are not working or neighbour’s homes – then sewage can back up
pipes, this may cause rainwater or sewage to back up are not existent. into the basement.
into your home.
Solution Solution Solution Solution
Disconnect weeping tiles and downspouts Replace your sump pump Smart landscaping Flood-proo ng devices
from the sanitary sewer system Ensure that your sump pump is properly Check that the ground around your house is sloping Homes prone to ooding should have sump pumps and
Rainwater should not be entering the sanitary maintained. If your sump pump has away from your foundation wall. This reduces back ow preventors to prevent rainwater or sewage from
(wastewater) sewer system. Have a quali ed plumber malfunctioned in the past, consider contacting the possibility of water entering through cracks in backing up into the basement. Talk to a quali ed plumber
disconnect your weeping tiles and downspouts from a quali ed plumber and having it replaced. your foundation or overloading the weeping tiles. about the best way to ood-proof your basement before
the sanitary sewer system. Install a sump pump and Direct your downspouts where water can be easily any device is installed. Each installation is di erent and
back ow preventor to send the rainwater to the ground absorbed, such as your lawn or ower bed. some devices require a plumbing permit. Be sure to get
surface or to the storm (rainwater) sewer system. at least three estimates before hiring a plumber.
Check your local Yellow Pages or Better Business Bureau
for a list of suppliers and contractors. Hardware, home
improvement, plumbing outlets and suppliers o er
information and equipment for do-it-yourself installations.
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