B.C. Coast Faces Three Days of Heavy Rain Starting Tuesday: What Homeowners Should Clear and Check Now

A Special Weather Statement, With Warnings Likely to Follow

Environment Canada re-issued its statement early Monday with the same message. The storms arrive Tuesday and run through Thursday across the North Coast, Central Coast, South Coast and Vancouver Island, with upslope terrain and higher elevations expected to get the heaviest rain. Some areas can also expect gusty southerly winds.

The agency is candid about what it does not yet know. Its special weather statement says there is still uncertainty about exact rainfall amounts and which areas will be hit hardest, and that rainfall warnings will be issued as the picture becomes clearer. In plain terms: the alert level is likely to rise, and nobody has published firm totals for this event yet.

What it does say clearly is where the risk sits. High rainfall rates could cause water to pool in areas with poor drainage and make local flooding worse. Communities with historically limited drainage capacity, and areas that have already taken heavy rain, are asked to be particularly vigilant.

The Storms Before This One

The weekend showed what this series can do. Earlier systems knocked out power to thousands of customers and triggered an evacuation order for about 30 properties in Zeballos on northwest Vancouver Island, according to The Canadian Press. In Surrey, a driver died Saturday after two vehicles were trapped under a fallen tree.

That context matters for planning. Power outages make backup power for a sump pump a real concern this week, not a theoretical one.

Clear the Curbside Storm Drain

Start at the street. Environment Canada's statement asks residents directly to make sure storm drains are clear of leaves and debris, and the timing explains why: this is peak leaf-drop season, and a blocked grate turns a street into a pond that has nowhere to go but toward driveways and low entrances.

The City of Vancouver's catch basin guidance sets out the safe method. Use a rake, broom or shovel to push leaves and debris away from the curb and grate, never your hands. Wear bright clothing, stay out of the travel lane where you can, and leave needles, broken glass or anything hazardous for city crews. Check the drain before the rain and again after each heavy burst.

If a drain will not clear and water is backing up, stop and report it. In Vancouver that is Van311 or 3-1-1; elsewhere on the coast, use your municipality's public works line.

Eavestroughs and Downspouts

Next, the roof drainage. Scoop leaves out of eavestroughs that you can reach safely from the ground or a properly footed ladder in dry conditions, and check that each downspout is flowing freely rather than spilling over at the top.

Where the water lands matters as much as whether it flows. Federal flood-prevention guidance recommends using a downspout extension to send water toward a well-draining area at least 2 metres (6 feet) from the foundation of your home and your neighbours' homes, where possible. A downspout that dumps beside the foundation feeds the soil that is pressing on your basement walls.

For a broader seasonal list beyond this storm, our flood prep checklist covers the same exterior basics in more depth: The Spring Flood Prep Checklist: 15 Things to Do To Protect Your Home.

Test the Sump Pump, and Its Backup

If your home has a sump pump, test it today. The Government of Canada's sump pump guidance describes the method: pour water into the sump pit and confirm that the pump switches on and moves the water out. Then go outside and check where the discharge pipe ends. It should send water away from your foundation, not down a slope toward your home or a neighbour's.

The same guidance says to check the pump during and after rainfall, and during a power outage, to confirm the pit is being emptied by the main pump and the backup. With outages already hitting the coast this month, that backup is the item most likely to matter. If you have a battery backup, confirm it is charged and switches on when the main pump is unplugged. If you have no backup at all, watch how quickly your pit fills during the first heavy rain so a power cut does not catch you off guard.

Check the Backwater Valve

A backwater valve stops sewage and stormwater from flowing back into the basement through floor drains, toilets and sinks when municipal pipes are overwhelmed. If you have one, two checks are worth doing now.

First, if the valve has a transparent cover, look at it during heavy rain. The same federal guidance says the flap or gate should be closed when the sewer is surcharging. Second, cut back on heavy water use while the rain is at its worst. Showers, baths, laundry and the dishwasher all send water down the drain, and when the valve is closed that water has nowhere to go but back into your basement. That is a "self-flood." Some valves have alarms that tell you when they have closed.

If you do not have a backwater valve, this week is not the time to install one. It means a plumbing inspection, municipal permits and breaking up the basement floor. Put it on the list for after the storm.

Lift Valuables Off the Floor

Last, the low-tech step that protects what insurance cannot easily replace. Move documents, photos, electronics and anything sentimental off the basement floor, onto shelves or upstairs. PreparedBC recommends storing valuables in water-tight containers. Unplug and raise what you can, and clear the area around floor drains so you can see them.

Our coverage of the Canada Day storms shows how quickly outages and basement water can arrive together: Ontario and Quebec Homeowners Face Days-Long Outages and Basement Flooding After Canada Day Storms.