Storm Season Survival: Protecting Your Drains During January Gales

The Met Office has named another storm, the wind is howling, and the rain is lashing against the windows. As a UK homeowner, this sound is all too familiar during January. While you’re safe and warm inside, your home’s first and most important line of defence against flooding is under attack: your drainage system.

Gutters, gullies, and underground pipes are suddenly asked to handle a massive volume of water, along with all the leaves and debris the gales have thrown at them. If they fail, the consequences can range from a waterlogged garden to a devastating internal flood.

At Plumbers 365, we are on the front line during every storm. We know what goes wrong and, crucially, how to prevent it. Here are the answers to your most urgent storm-related drainage questions.

How do I prepare my drains before a named storm hits the UK?

Drainage experts at Plumbers 365 have often seen that proactive preparation is everything. A few simple checks can make a huge difference:

• Clear Drain Grates and Gullies: Walk around your property and clear away any leaves, twigs, mud, and debris from the tops of all drain covers and grates. This is the most common and easiest-to-fix cause of surface flooding.
• Check Your Gutters: Look up to see if your gutters are overflowing or if plants are growing out of them. If they are, they need clearing.
• Secure Loose Items: Make sure garden furniture, pots, and children’s toys are tied down or put away so they can’t be blown over and block a crucial drain opening
• The “Boot Check”: Put on your wellies and kick away the pile of wet leaves sitting on top of your driveway drains.
• Roof Review: Binoculars check. Is there moss hanging out of your gutters? If so, that moss will wash down and block the pipe the moment the rain starts.
• Water Butts: If they are full, drain them halfway. If they overflow during a storm, they dump water right next to your foundations.

Can high winds damage my external drainage system?

According to drainage experts at Plumbers 365, high winds act as the troublemaker when rain causes flooding, specifically by damaging Soil Vent Pipes on the roof or causing tree root heave that cracks underground pipes. They don’t typically damage underground pipes directly, but they cause chaos in other ways:

• Debris Overload: Gales strip trees of their last leaves and twigs, dumping them directly onto your drains and into your gutters, causing instant blockages.
• Damage to Vent Pipes: Strong winds can damage your soil vent pipe (the open pipe on your roof that ventilates your drainage system). A broken vent pipe can lead to poor drainage and bad smells inside your home.
• Structural Damage: In extreme cases, wind can damage roof tiles, which can then fall and smash guttering or block gullies.

Why do drains flood more during January storms?

According to drainage experts at Plumbers 365, more flooding during January storms is the “Sponge Effect.” The ground is already fully saturated from December rains, so new rainfall has nowhere to go but to pool on the surface. Plumbers 365 drainage experts consider this to be a perfect storm of conditions coming together: 

• Saturated Ground: After months of autumn and winter rain, the ground is already waterlogged. It simply can’t absorb any more water, so rainfall immediately becomes surface runoff.
• Autumn Debris: The bulk of the leaves that fell in autumn have now turned into a heavy, wet pulp that creates dense, stubborn blockages in pipes and gullies.
• Intense Rainfall: Winter storms often bring a huge volume of rain in a very short period, which is more than a standard domestic drainage system is designed to handle all at once.

When a storm dumps 40mm of rain in an hour, that water stays on the surface, rushing towards the lowest point (your drains). Plumbers 365 drainage experts note that if your drains are even partially restricted by silt or leaves, they will be instantly overwhelmed.

What should I do if debris blocks my drain grates during a storm?

Drainage experts at Plumbers 365 stress upon the need for personal safety especially during the height of a storm with high winds or lightning to clear a drain. If the conditions are safe (i.e., the rain is heavy but the wind has died down), you can use a rake or a stiff brush to clear leaves and debris from the top of the grate to allow water to flow again. Experts at Plumbers 365 warn to never lift a heavy manhole cover during a storm. During a storm, water pressure can dislodge manhole covers. If you wade into a puddle to clear a drain, you might step into an open sewer shaft.

Only clear debris if you are on solid ground. If the water is rising rapidly towards your home and you cannot clear it safely, call Plumbers 365 or the Fire Brigade if there is a risk to life.

How do I clear my gutters and downpipes before storm season?

Plumbers 365 drainage experts suggest working  from the ground up where possible, or use a stable ladder to scoop debris out, then flush with a hose to check for flow. Blocked gutters being the #1 cause of penetrating damp during storms, you should: 

• Scoop: Remove the “gutter mulch” (rotting leaves).
• Flush: Put a hose in the top. Watch the downpipe at the bottom.
• Check: If water sprays out of a joint halfway down, the pipe is blocked or the seal has failed. This concentrated spray can saturate your brickwork in minutes during a storm.

Can storm damage to drains be claimed on home insurance?

Drainage experts at Plumbers 365 have often seen that in most cases, storm damage can be claimed on home insurance as standard home insurance policies usually cover “storm and flood” damage. However our experts have also witnessed scenarios where insurers will reject claims if they find the damage was actually due to “Wear and Tear” or “Lack of Maintenance.”

According to drainage experts at Plumbers 365, if a tree falls and smashes your drain, you are covered. However, if your gutter collapses because it was heavy with 5 years of accumulated moss, the insurer will call that negligence. You must keep your drains maintained to ensure your policy remains valid for the big events.

Why is sewage coming up through my drains during heavy storms?

Drainage experts at Plumbers 365 consider this to be a terrifying and hazardous situation caused by hydraulic overload in a “combined” sewer system (where rainwater and sewage share the same pipes). The public sewer is full of rainwater and is pushing the mix of rain and sewage back up your private pipes. During a severe storm, the sheer volume of rainwater entering the sewer system can exceed its capacity. With nowhere else to go, the pressurised water and sewage mixture takes the path of least resistance, which is often back up the pipes and into homes at the lowest point, usually a downstairs toilet, shower, or external gully.

What’s the difference between storm water flooding and drain backup?

As per drainage experts at Plumbers 365, Storm Water is relatively clean rainwater pooling on the surface. Drain Backup is foul water (sewage) coming up from below ground. Plumbers 365 drainage and plumbing experts note the major difference as: 

• Storm Water Flooding: This is when water enters your property from the outside. For example, a river bursts its banks, or the street drains are overwhelmed and water flows across your garden and under your door.
• Drain Backup: This is when water comes up from the inside of your own home, through your plugholes, toilets, and shower trays. This is a clear sign your own drains or the main sewer they connect to are blocked or overloaded.

The health risks associated with the above remain as: 

• Surface Water: Annoying, damages carpets, but generally not toxic.
• Foul Backup: Contains raw sewage, bacteria, and rats. This is a biohazard. If this enters your home, you need professional sanitisation, not just a mop.

How do I report storm damage to public drains in my area?

Plumbers 365 drainage and plumbing experts note that it is highly essential to inform the right authorities based on the issues such as : 

• Blocked Grates/Gullies on Public Roads: These are the responsibility of your local council (e.g., Hampshire County Council, Bristol City Council etc.). Most have a “Report a Blocked Drain” or “Report a Flood” page on their website.
• Overflowing Manholes in the Street/Garden: These are part of the main sewer network and are the responsibility of your regional water company (e.g., Thames Water, Southern Water, Wessex Water). They will have a 24/7 emergency number on their website.

Should I install a non-return valve to prevent storm water backflow?

According to drainage experts at Plumbers 365, if your property is at risk of sewer backup during storms, a non-return valve is one of the best protective measures you can install. This is a device fitted into your drainage pipe that has a one-way flap. It allows wastewater to flow out from your property as normal but automatically slams shut if water tries to flow back towards your house from an overloaded main sewer. It’s a simple, effective, and professional solution to prevent a sewage backup disaster.

Weathering the Storm?

When the wind is howling and the water is rising, you need a team that turns up.

Plumbers 365 provides emergency drainage response across the UK, rain or shine. Whether you need pre-storm gutter cleaning or emergency flood relief, we are ready.