Flood Hazard Risk Assessment Project

Flooding in Pitt Meadows: How would it affect you?

The City of Pitt Meadows is currently undertaking a Flood Hazard Risk Assessment project funded by the National Disaster Mitigation Program (NDMP), which is working to make Canadian communities Flood-Ready.

The goal of the project is to identify the risk of flood hazards in the City, and ultimately develop a plan to mitigate the hazards. The project will look at other larger studies conducted for the Lower Mainland and assess them specifically for Pitt Meadows.

As part of this project, the City would like to hear from you about flooding and what is most important to you should you be impacted by a flood. Citizen input will be included in the development of the risk assessment and future planning of flood mitigation projects.

The City hosted an Open House on November 30, 2017 educate residents about the risks, scenarios for Pitt Meadows, and to hear feedback on how residents may be impacted and what is important to them.

Didn't get to attend the Open House? You can still view the display information boards and offer your feedback in the online survey. The survey will be live until January 9.

 I am a Resident/Homeowner:

I am a Business:

Flood Hazards in the City

  • Dike Breach
  • Rainfall
  • Snowmelt
  • Log Jam/Beaver Dams
  • Pump Station Failure
  • Extreme Tides
  • Tsunamis
  • Upstream Dam Breach
  • Storm Surges

Flood Hazard Scenarios in Pitt Meadows

For the Flood Hazard Risk Assessment, the following Hazard Scenarios were identified as critical to the risk assessment:

Scenario A - 1:500 Annual Exceedance Probability (AEP*) (See Map of Probable Affected Area)

  • Based on the 1894 Fraser River flood of record
  • High tide conditions
  • Current sea level

Scenario B - 1:500 AEP* + Climate Change + Sea Level Rise (See Map of Probable Affected Area)

  • Design flood for Year 2100
  • Based on 1 in 500 year flood
  • High tide conditions
  • 1m sea level rise and moderate climate change

Scenario C - Alouette River Hydro Dam Breach (See Map of Probable Affected Area)

  • BC Hydro dam breach unundation map

Scenario D - Prolonged Heavy Rainfall (See examples of affected areas)

*Annual Exceedance Probability (AEP) is another way to describe the recurrence interval of a naturally occurring event (rainfall, earthquakes, flooding, etc.). The AEP is based on the probability that a given event will be equalled or exceeded in any given year. For a flood with an AEP of 1:500, there is a 1 in 500 chance that that event will occur or be exceeded during any year.