Every year around November, our call volume for flooded porches and backed-up drains triples. The rain gets the blame, but rain is only the trigger. The real cause built up quietly over the dry months: leaves, sand, plastic wrappers and kitchen grease narrowing the drains until the first big storm finds the bottleneck. An hour of prevention in September or October beats a wet living room in December.
Know your two drain systems
A landed home has two separate drainage worlds. The perimeter drains — the open concrete channels around the house — carry rainwater to the municipal drain. The internal waste lines carry water from sinks, showers and toilets underground to the sewer. Monsoon trouble usually starts in the first system, but a blocked internal line plus a storm is the combination that floods bathrooms from the floor trap up.
The pre-monsoon hour: four tasks
- Walk the perimeter. Lift leaves, silt and debris out of the open drains, especially at corners and where the drain passes under walkways — those covered sections clog first and are hardest to see.
- Find your outfall. Locate where your drains discharge into the municipal channel and make sure that junction is clear. A blockage there backs up the entire perimeter.
- Check the gutters. Roof gutters and downpipes drop their load into the same perimeter drains. A downpipe packed with leaves delivers a waterfall over your walkway instead.
- Test the floor traps. Pour a bucket of water down each bathroom floor trap. Slow draining now means a partial clog that a storm surcharge will finish off.
Early warnings worth acting on
Blockages announce themselves before they flood. Gurgling from floor traps when the washing machine drains means air is fighting water in a narrowing pipe. A sewage smell in the bathroom after rain means the trap is being siphoned by poor flow downstream. Water pooling around the porch drain for more than a few minutes after a normal shower of rain means the channel is silting up. All three are cheap to fix at this stage.
The most expensive drain calls we attend every monsoon are the ones that gave two months of polite warnings first.
What to keep out of the drains year-round
Cooking oil is the number one villain — it leaves the pan as liquid and becomes wax inside the pipe. Collect it in a jar and bin it. Rice, coffee grounds and food scraps belong in the bin too, not the sink. Outside, avoid sweeping garden waste and sand into the perimeter drain; it is the sediment base that everything else sticks to.
When to bring in a machine
If a line blocks repeatedly in the same spot, something structural is going on — a bellied pipe, root intrusion or a collapsed section. Repeated plunging treats the symptom. A camera inspection finds the cause in one visit, and jetting clears grease build-up that no hand tool reaches. Our drain crews carry both.