Where the water comes from

When rain falls faster than the ground or drainage network can absorb and remove it, it flows across roads, paths and gardens. It can collect in dips, at doorways or at the bottom of sloping drives. This is often called surface-water or pluvial flooding.

Why location matters

A house downhill from a road, a paved area or neighbouring land may receive runoff even when there is no river nearby. Older combined drainage systems may also struggle during very heavy storms.

Clues worth recording

Note which direction the water travels, where it first gathers and whether gullies are blocked. Photographs taken safely during rainfall can be more useful to a contractor than a description after everything has dried.

Is the public drain responsible?

Road gullies are often maintained by the highway authority; public sewers may be the water company’s responsibility. Private drains, gullies and landscaping may fall to the owner. Do not assume you must pay to repair equipment you do not own.

Possible improvements

Depending on the site, work might involve clearing drains, changing levels, installing suitable channel drainage or creating properly designed storage and infiltration. A soakaway is not right for every soil or location.

When to seek help

If water repeatedly approaches the building, arrange an assessment before choosing a solution. Redirecting water without understanding where it will go may simply move the problem to another property.

Why a house far from rivers can still flood

Intense rain can exceed the capacity of gullies and local drains, or simply run over the ground faster than it can soak in. Roads, drives and patios may direct water towards a low entrance even when the river remains far away. The shape of the immediate neighbourhood is important: kerbs, walls, slopes and past resurfacing work can create unexpected flow routes.

Look for the weakness in your own property

Check whether paving falls towards the house, whether drains have effective outlets and whether thresholds, garages or airbricks lie below surrounding levels. A temporary barrier may help shallow flooding but will not solve water entering through the floor or drainage system. Photograph the route during rainfall, where safe, and ask for a coordinated assessment before paying for isolated repairs. Check official flood-risk maps, but remember they cannot predict every local blockage or sudden storm.

Follow the route of the runoff

Surface water usually follows the easiest route downhill, but small details can redirect it. A raised kerb, a sunken drain, a newly paved garden or a driveway sloping towards the house can change where a sudden cloudburst ends up. It helps to observe the water from somewhere safe and mark the areas where it first collects. Photographs taken during rainfall often explain far more than a photograph of the puddle afterwards. Never step into fast-moving water or open a flooded inspection chamber to find out where it goes.

Pay particular attention to entrances, garage thresholds and the base of external walls. Check whether the water arrives from a road, an adjoining property, a roof outlet or the immediate garden. That distinction matters. A blocked private drain may be repairable by a drainage contractor; significant runoff from a highway or a wider area may need to be raised with the relevant authority.

Before paying for alterations

A channel drain across the front of a garage can be useful when water is running down a driveway. Yet the channel is only the collection point. It still needs an appropriate outlet, and that outlet has to cope when the ground is wet and the drainage system is under pressure. Likewise, a soakaway is not automatically suitable for clay soil, a high water table or a location too close to foundations. A proposed drainage solution should account for ground conditions, available falls and legal discharge arrangements.

Ask contractors to show you the likely flow path before and after their proposed work. Will the paving be regraded? Is the outlet being inspected or replaced? What happens if a storm exceeds the design capacity? The quotation should include making good and a way of checking that the repair works. If there is a possibility of water reaching the house, consider appropriate property-level protection as well as drainage changes.

Reliable further information

For current warnings, official flood-risk maps and safety advice, use the relevant government service. This website cannot assess live conditions at your home.

Government flood guidance · National Flood Forum · Citizens Advice