: A blow bag attaches to a hose and expands to seal the pipe, forcing water through with enough pressure to dislodge many clogs. When to Call a Professional
If water overflows from the gutters even though the gutters themselves are clean, the water is backing up from a blockage further down.
: Disconnect the downpipe from the underground adapter and insert a garden hose. Turn the water on full blast to see if the pressure can push the debris through to the discharge point. downpipe blocked underground
: For minor organic build-up, you can try pouring bicarbonate of soda followed by white vinegar into the drain. The fizzing reaction can help loosen grime before you flush it with hot water. For more detailed instructions, you can check out guides on the Drainage Superstore website.
"Hello [Name], we have an issue with the downpipe at [property address]. It’s blocked underground – when it rains, water comes back up and sits near the foundations. Can you arrange for a drain clearance as soon as possible to prevent flooding or foundation damage? Happy to send a video. Thanks." : A blow bag attaches to a hose
Large puddles at the base of the downpipe or soggy patches in the yard indicate that water has nowhere to go but up and out.
The underground downpipe (often referred to as the underground drain or "gully") is the pipe that carries rainwater from the roof gutters and downspouts away from the house and into the main sewer system or a soakaway. Its primary purpose is to prevent water from pooling around the foundation of the building. Turn the water on full blast to see
Attempting to fix an underground blockage yourself is possible, but it requires caution.
Preventing an underground blockage is significantly cheaper than repairing one.
This guide explores the causes, warning signs, and solutions for underground drainage blockages, helping property owners act before a minor clog becomes a major renovation.