Manchester has a well-earned reputation for rain. The city receives around 810mm of rainfall annually — roughly double the average for the south of England — with the wettest months typically between October and January. For drainage systems, this means winter is the most demanding time of year.
Combine heavy rainfall with falling leaves, frost, and increased indoor water use, and you have the conditions that produce most of the emergency callouts we attend between November and March. Most of them are preventable.
Why Winter Is Hard on Drains
Rainfall Volume
Manchester’s combined sewer system — where surface water and foul water share the same pipes — means heavy rainfall adds enormous additional load. During prolonged wet spells, surface water overwhelms the system capacity, increasing backpressure in the network and raising the risk of blockages causing backups.
Fallen Leaves and Garden Debris
Autumn leaves are one of the most underestimated causes of drain problems. They accumulate in gullies, downpipes, and surface water drains, forming a compacted mat that blocks flow. Once wet and compacted, leaves are far harder to shift than a typical grease blockage.
Frost and Frozen Pipes
When temperatures drop below zero, standing water in pipes can freeze. Frozen pipes restrict flow, and if the ice expands significantly, it can crack pipes — especially older clay or pitch fibre drains already weakened by age or root ingress. Manchester’s temperatures rarely drop severely for extended periods, but a hard frost lasting several days is enough to cause problems in exposed pipework.
Increased Indoor Use
More time indoors in winter means more cooking, more baths, more laundry. Grease, soap, and general waste increase. Pipes that cope adequately in summer can tip into blockage during winter’s heavier use.
Pre-Winter Checklist
Work through this before the worst weather arrives — ideally in October or early November.
Gutters and Downpipes
- Clear gutters of leaves and debris — full gutters overflow onto the building and saturate the ground around foundations
- Check downpipes are flowing freely — pour a bucket of water in at the top and watch it drain at the bottom
- Check downpipe connections to underground drainage are clear and not cracked
Surface Water Drains and Gullies
- Clear all visible gully gratings of debris and leaves
- Pour a bucket of water into each gully to confirm it’s flowing
- If a gully is slow, it needs jetting before winter sets in — call us before the leaves get worse
Manholes and Inspection Chambers
- Lift and check your accessible manholes — look for debris build-up or standing water (normal level should be just below the outlet pipe)
- If you see debris near the surface of the water in a manhole, the pipe downstream may be partially blocked
Outdoor Taps and Exposed Pipework
- Lag any exposed outdoor pipes in unheated areas — garages, outbuildings, crawl spaces
- Know where your stopcock is and make sure it turns easily
Trees Near Drains
If you have mature trees within 10 metres of your drainage runs, tree root ingress is a year-round risk that accelerates in winter when the ground softens and roots push further. If you haven’t had a CCTV survey recently and you have mature trees nearby, now is a good time to book one.
During Winter: Warning Signs to Watch
Act quickly if you notice:
- Any drain running slower than usual — don’t wait for a complete blockage
- Gurgling sounds from toilets or drains after use (pressurised system)
- Wet patches in the garden over drain runs (possible pipe leak or collapse)
- Rising water levels in manholes after heavy rain
- Drain smells inside the property
Early intervention is always cheaper than an emergency. Call us on 0161 282 8080 for a same-day assessment.
Emergency Preparation
Even with good preparation, emergencies happen. Be ready:
- Know where your stopcock is (under the kitchen sink or near the front door in most Manchester terraces)
- Have our number saved: 0161 282 8080 (available 24/7)
- Know which drains are your responsibility and which are United Utilities’ — see our guide
- Keep a supply of towels, rubber gloves, and a bucket somewhere accessible
After a Heavy Rainfall Event
After significant rainfall, check:
- Surface water drains — clear any debris that has washed in
- Gulley gratings — leaves from a neighbour’s garden travel a long way in heavy rain
- The garden over buried drain runs — any new wet patches or subsidence?
For properties in low-lying areas of Manchester or near the River Irwell and Mersey flood plains, surface water flooding risk increases significantly in winter. If your property has flooded before, consider fitting non-return valves on your drainage connections.
We cover Manchester, Salford, Bury, Rochdale, Bolton, Wigan, Stockport, Oldham, and Trafford.
Call 0161 282 8080 or contact us online to book a pre-winter drain inspection.
Frequently Asked Questions
When is the best time to have drains serviced before winter?
October is ideal — before the worst leaf fall and before the first sustained cold spells. This gives time to deal with any issues found before conditions deteriorate.
Can frost crack my drain pipes?
Yes, particularly older clay, pitch fibre, and cast iron pipes, and any pipework in unheated areas or with shallow burial depth. Modern PVC pipe is more resistant to frost but not immune if there is standing water and prolonged freezing temperatures.
My drains were fine all summer. Why do they block in winter?
Winter increases the load on drainage in multiple ways simultaneously — more rainfall, more indoor use, leaves and debris. A pipe with a partial blockage or slight defect that copes in summer may fail under this additional pressure. It reveals a latent problem rather than creating a new one.