FloodMitigation

 

Background

Our city receives about 345 millimetres (14 inches) of rain a year, most of

which falls from May to October. Though this is not a huge amount of

precipitation, our summer storms tend to drop large amounts of rain over

short periods of time. During major rainstorms the sheer volume of water can

back up drainage systems and flood basements.

Program

Drainage Planning and Engineering sponsors a Flood Prevention Program to

equip homeowners with the information and knowledge to make drainage

improvements.

Goals

The Flood Prevention Program is intended to meet 2 objectives:

1. To reduce risk of basement flooding due to sewer backup during rainfall

events.

2. To reduce wet weather flows in the sanitary sewer system.

Basement Flooding Complaint Procedures

There are two complaint procedures established:

1. Immediate Complaint Procedure

This procedure is to be used when reports of rainfall related sanitary

sewer backup are received within 2 weeks of a specific rainfall event.

Complaints must be registered by calling 311 within 2 weeks of the

specific rainfall event. 

Sanitary sewer backup must be the main source of flooding in order to

get the funding approved for flood proofing measures.

2. Delayed Complaint Procedure

This procedure is to be used when reports of rainfall related sanitary

sewer backup are received later than 2 weeks after a specific rainfall

event. Drainage Planning and Engineering may notify the public of a

flooding response program relative to a specific rainfall event. 

Complaints must be registered by calling 311 in order to be evaluated for

possible program subsidy.

Four Key Messages

1. Downspouts

Downspouts should extend at least 1.8 metres (6 feet) from your

basement wall and drain away from the house toward a street or back

lane.

2. Lot Grading

Land should slope outward from the foundation of the house for a

minimum of 1.8 metres (6 feet).

3. Flood-proofing Devices

Individual and neighbourhood drainage systems prone to flooding should

have a flood-proofing device, such as a sump pump or backwater valve,

installed to keep rainwater and sewage from backing up into basements.

4. Plumbing Fixtures

A qualified plumber should inspect all plumbing fixtures and flood-

proofing devices regularly to make sure they are in good conditions.