Inspect Window Well Drains Before Heavy Rain Hits

Window wells with clogged or missing drains are a common cause of basement flooding during atmospheric river events. When heavy rain parks over the Lower Mainland for days, water has nowhere to go except through egress windows. The frustrating part? A 20-minute inspection can catch drainage problems weeks before they become emergencies.

Window well drains are one of those things that work quietly until they don’t. And when they fail during a heavy storm, there’s not much anyone can do except watch the water rise.

What You’ll Learn

• How to find drains that aren’t always obvious
• A simple test that shows whether drainage actually works
• Warning signs that mean trouble’s coming
• The point where DIY ends and professional help begins

Gather a Few Basic Supplies

Nothing fancy here. A flashlight, garden gloves, something to scoop with (a hand trowel or even a big kitchen spoon works), a 5-gallon bucket, and a garden hose.

Start by Clearing Out the Muck

Window wells collect everything. Leaves, pine needles, that weird black sludge that forms when organic stuff breaks down over winter.

In South Surrey, cedar and fir debris are the main culprits, and they compact into dense mats that water can’t penetrate. Scoop all of it out, right down to the gravel. Debris layers can reach 10 cm thick in wells that look fine from the surface.

Find the Drain

The drain sits at the lowest point of the well, usually under a small round grate or buried in the gravel. Some older homes have drains that tie directly into the foundation’s perimeter system. Others have standalone pipes that route water away separately.

If there’s no drain at all, that’s a bigger conversation. But first, let’s assume there is one.

Check What You’re Working With

Pull the grate off and shine the flashlight down there. Roots are common near mature trees, and they love drainage pipes.

Warning Signs to Look For

• Sediment buildup that’s hard and crusty
• Standing water that should’ve drained days ago
• Root intrusion is visible in the opening
• Sewage smell (may indicate improper connection)

Pay attention to smell. Musty is normal for something that sits underground. But if it smells like sewage, that drain might be connected somewhere it shouldn’t be. In some cases, window well drains have been accidentally tied into sanitary lines during construction.

The Bucket Test

Here’s where we find out if the drain actually does its job. Fill the bucket and pour it straight into the drain opening, then watch.

What the Results Mean

• Drains in 30 seconds or less: Healthy drain, usually with a satisfying gurgle as water flows through
• Takes longer than 60 seconds: Partial blockage somewhere in the line
• Water just sits there: Line is completely clogged or collapsed

Push It a Little Harder

Assuming the bucket test went okay, hook up the garden hose and let it run into the well for a few minutes. This simulates what actually happens during an atmospheric river, when rain falls at 20-30 mm per hour for extended periods.

Watch for backup. Some blockages only show themselves under sustained flow.

While the Hose Runs

Check inside the basement at the same time. Look at the wall near that window for any signs of moisture.

If water won’t recede after you’ve cleared the visible debris, or if there’s no drain at all, call a licensed plumber before the next storm rolls through. Installing or repairing window well drainage involves connecting to the home’s perimeter system with proper slope, and that’s not weekend project territory.

Mistakes We See All the Time

Those plastic bubble covers over window wells? They don’t eliminate maintenance. Water still gets in around the edges, and debris still breaks down underneath. Drains under these covers can go years without functioning while the problem stays hidden.

Adding more gravel and packing it down tight looks tidy, but it actually chokes drainage. That gravel needs to stay loose so water can flow through.

Waiting until water shows up inside is the most expensive mistake of all. The whole point of checking now is catching problems before they turn into emergencies during a storm.

When This Becomes a Pro Job

This inspection identifies issues. Fixing them often takes equipment most people don’t have.

Call a Plumber If

• The bucket test fails completely after clearing debris
• Water backs up during the extended hose test
• There’s no drain installed at all
• Something smells like sewage

Perimeter drain cameras, hydro-jetting, proper tie-ins to existing systems, and slope calculations aren’t DIY territory. A plumber can figure out whether it’s a simple clog, a collapsed section of pipe, or a drain that was never installed in the first place.

Key Takeaways

• Window well drains often hide under gravel or grates at the lowest point of the well
• The bucket test reveals drainage problems in under a minute
• Plastic covers don’t prevent clogs, and debris still accumulates underneath
• Partial blockages may only show up under sustained water flow
• No drain or failed drainage after clearing debris means it’s time to call a licensed plumber

The Bottom Line

Window well drains don’t ask for much attention, but they need a little before storm season hits. Twenty minutes of clearing debris and running the bucket test catches most problems while they’re still cheap fixes.

If a window well won’t drain or there’s no drain to begin with, we can help sort it out.