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Common Types of Flood in BC

Types of flood that occur in BC include:

  • River (Fluvial or riverine): flooding that occurs when creeks or rivers overflow onto dry land, typically resulting from snowmelt or heavy rainfall
  • Coastal: flooding that occurs when the ocean levels are higher than normal as a result of tide or storm activity
  • Pluvial: flooding that occurs during and after heavy rain or snow when water ponds in low-lying areas, particularly in urban areas if streets and drainage systems are overwhelmed
  • Groundwater: flooding that occurs when groundwater tables are high (usually as a result of nearby riverine, coastal and/or pluvial flooding) and water is pushed up to the surface
  • Tsunami: a type of coastal flood that occurs when large waves form as a result of geological activity (an earthquake or a landslide) in a large body of water
  • Glacial outburst: the sudden, usually natural, release of impounded water held behind a glacier
  • Dam or dike failure: the sudden release of water as a result of infrastructure failure (e.g., release of water previously stored in a reservoir).

Rotary Beach, Okanagan Lake during the 2017 flood

Major Floods Hazards in the Lower Mainland

In the Lower Mainland, communities can experience local flooding from heavy rainfall or from nearby creeks or rivers that overflow their banks.

Two types of flood create the most serious concern for the region.

Fraser River Flood

Coastal Flood