Flash floods can occur within minutes of excessive rainfall, a dam or levee failure, or a sudden release of water held by an ice jam. Overland flooding, the most common type of flooding event, typically occurs when waterways, such as rivers or streams, overflow their banks as a result of rainwater or a possible levee breach and cause flooding in surrounding areas. It can also occur when rainfall or snowmelt exceeds the capacity of underground pipes, or the capacity of streets and drains designed to carry floodwater away from urban areas.
Be aware of flood hazards no matter where you live or work, but especially if you are in low-lying areas, near water, behind a levee or downstream from a dam. Even very small streams, gullies, creeks, culverts, dry streambeds or low-lying ground that appear harmless in dry weather can flood.
With all the flooding that’s recently occurred around the world, it’s easy to forget that we’re not immune to it in Canada. Just take a look at the recent effects of flooding in Montreal:
Before a Flood
What would you do if your property were flooded? Are you prepared?
Even if you feel you live in a community with a low risk of flooding, remember that anywhere it rains, it can flood. Just because you haven’t experienced a flood in the past, doesn’t mean you won’t in the future. Flood risk isn’t just based on history; it is also based on a number of factors including rainfall, topography, flood-control measures, river-flow and tidal-surge data, and changes due to new construction and development.
Flood-hazard maps have been created to show the flood risk for your community. This helps determine the type of flood insurance coverage you will need since standard homeowners insurance doesn’t cover flooding. The lower the degree of risk, the lower the flood insurance premium.
To prepare for a flood, you should:
- Build an emergency kit and make a family communications plan. Please contact Tripemco Burlington Insurance Group Limited if you would like us to provide you with an emergency kit checklist or sample family communications plan.
- Avoid building in a floodplain unless you elevate and reinforce your home.
- Elevate the furnace, water heater and electric panel in your home if you live in an area that has a high flood risk.
- Consider installing “check valves” to prevent floodwater from backing up into the drains of your home.
- If feasible, construct barriers to stop floodwater from entering the building and seal walls in basements with waterproofing compounds.
During a Flood
If a flood is likely in your area, you should:
- Listen to the radio or television for information.
- Be aware that flash flooding can occur. If there is any possibility of a flash flood, move immediately to higher ground. Do not wait for instructions to move.
- Be aware of stream, drainage channels, canyons and other areas known to flood suddenly. Flash floods can occur in these areas with or without typical warnings such as rain clouds or heavy rain.
If you must prepare to evacuate, you should do the following:
- Secure your home. If you have time, bring in outdoor furniture. Move essential items to an upper floor.
- Turn off utilities at the main switches or valves if instructed to do so. Disconnect electrical appliances. Do not touch electrical equipment if you are wet or standing in water.
If you have to leave your home, remember these evacuation tips:
- Do not walk through moving water. Fifteen centimetres (six inches) of moving water can make you fall. If you have to walk in water, walk where the water is not moving. Use a stick to check the firmness of the ground in front of you.
- Do not drive into flooded areas. If floodwaters rise around your car, abandon the car and move to higher ground if you can do so safely. You and the vehicle can be swept away quickly.