Why drains may overflow during storms and how to distinguish blocked pipes from overwhelmed surface water drainage.
Rain can expose an existing restriction
A pipe that copes with a little flow may struggle during a downpour. Leaves, silt and debris in rainwater gullies and outlets are common sources of trouble.
Rainwater and sewage are not always linked
A garden gully or downpipe may discharge to a soakaway or separate surface water drain. Do not assume an overflowing rainwater pipe shares the kitchen waste drain.
What standing water can tell you
Puddles next to a rainwater gully might suggest local obstruction or inadequate falls. Sewage emerging from an inspection chamber is a different concern.
Check the wider area
When neighbouring properties and roads are also flooded, public drainage capacity or surface runoff may contribute. A private contractor cannot necessarily fix an overloaded public system.
Describe the pattern
Note which location floods, how soon after rain begins and how long the water takes to subside.
Need a drainage specialist?
You can describe your drainage problem and request quotes from local tradespeople through MyJobQuote. Ask the person you choose to explain the cause, price and scope of any proposed work.