Flood Protection

Coquitlam has over 550km of storm mains throughout the City collecting stormwater runoff. In order to protect residents and businesses from potential flooding there are catch basins, ditches and rainwater source controls in place to collect rain runoff. To ensure the drainage system is functioning and operating properly the City does preventative maintenance. For example, they perform catch basin cleaning, culvert inlet and outlet clearing, flood patrol and flushing/vacuuming of storm mains and services. Residents and homeowners can help prevent flooding by not only ensuring their foundation drainage pipes work properly, but by clearing debris from catch basins and ditches fronting their property.

Visit our interactive map of the City’s drainage network, where you can see if there are any Catch Basins or drainage infrastructure around your property.

Catch Basins

Catch basins allow rainwater runoff to be collected and prevent road and property flooding. You may notice some catch basins marked with a yellow fish - this fish is a reminder that all catch basins eventually lead to creeks, streams and environmentally-sensitive water bodies. Therefore, you can help protect the environment and fish habitat by being mindful of the following:

  • Dispose of household hazardous wastes like oil, paint and toxic chemicals at proper disposal facilities.
  • Don’t empty hot tubs or pools into the storm sewer system. Chlorine and pool chemicals are lethal to fish.
  • Avoid the use of pesticides and fertilizers – these cause excessive vegetation growth in streams which chokes out the oxygen needed for fish and aquatic life to survive.
  • Limit the areas of concrete, paving and other hard surfaces on your property. Rain that soaks into the ground helps keep streams flowing during periods of low rainfall.
  • Wash cars on your lawn to prevent soap and other detergents from entering catch basins and polluting streams.

Residential Flood Prevention

Flooding can happen when extremely heavy rainfalls occur and the runoff exceeds the capacity of the drainage system. Flooding can also happen when a drain pipe becomes blocked by tree roots or debris.

Here are some steps you can take to avoid flooding around your home.

  • Clean your foundation drains and Sumps. These drains collect water from your house and property and direct it to the City storm sewer. The pipes can become blocked by leaves, dirt, roots or debris and should be cleaned out periodically or, in some cases, replaced.
  • Clear Gutters and Catch Basins. Keep catch basins and gutters clear of leaves and debris. Rake up leaves in the fall to prevent overland flooding caused by plugged drains. Find the catch basin nearest your home or business and check periodically that it is clean so the water can drain properly.
  • Clear Ditches and Culverts. If you have an open ditch along your property, check to see that it is clear. Common items such as toys, balls, and milk jugs can often get lodged in the culverts and cause water to back up.
  • Repair broken pipe or damaged foundation drains and sub drains. Broken or damaged pipe can cause blockages and flooding of your home. Check that your home drainage system is working properly.

Engineering ​& Public Works Customer Service
604-927-3500
epw@coquitlam.ca