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Blocked Outside Drain & Gully in Derby

An overflowing yard drain, kitchen gully, or inspection chamber is the most visible sign of a drainage problem. Leaves, silt, and cooking grease are the usual causes. We jet, clear the chamber, and check the connection — same day in most cases.

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Drainage emergency? Don't wait — call us now and we'll aim to be with you within 1-2 hours.

01332 529121

Types of External Drain Problem We Clear

Blocked Gully

A gully is the surface drain cover in your yard, at the base of a downpipe, or by the kitchen waste outlet. Gully pots fill with leaves, silt, and debris — particularly in autumn when Derby's mature street and garden trees shed heavily. A full gully pot reduces to zero the drain's capacity to cope with rainfall. Clearing it is often straightforward, but the connection pipe below the gully also needs jetting if the underlying drain has restricted.

Kitchen Waste Outlet Blockage

The external gully that receives waste from the kitchen — dishwasher, sink, washing machine — is particularly prone to grease build-up. Unlike a leaf blockage that sits visibly at the top, kitchen grease accumulates in the pipe below the gully, narrows it progressively, and then suddenly blocks when the constriction reaches a critical point. Jetting clears it; regular use of a biological drain treatment can slow the re-accumulation.

Inspection Chamber Overflow

An inspection chamber — the accessible point where the drain changes direction or where multiple drains join — that is overflowing at surface level means the drain downstream is blocked. The chamber itself may be clear but is backing up because nothing can pass the blockage. We locate the blockage from the chamber and jet it clear.

Yard Drain or Drive Gully

Surface water drains in paved areas and driveways accumulate silt, oil, and debris from vehicle traffic. In Derby's older terraced housing where yards are small and drains are under constant foot traffic, these block regularly. Rodding and jetting clear the immediate blockage; lifting and cleaning the gully pot gives a longer-term result.

What to Clear Yourself and When to Call

If you can see the blockage in the top of the gully pot — leaves, silt, debris visibly obstructing the drain opening — clearing it by hand is quick and effective. Use rubber gloves, scoop out the debris, and test with a bucket of water.

Call us when:

  • The gully pot is clear at the top but the drain is still overflowing
  • The inspection chamber is overflowing at surface level
  • The blockage is inside a kitchen waste pipe with grease build-up
  • The outside drain backs up into an internal drain or appliance
  • The problem has recurred three or more times in a season

Related services: Drain Unblocking · Drain Jetting · Soakaway Installation

Areas We Cover

Not sure if we cover your area? Call us — we serve all of Derby and surrounding Derbyshire.

Frequently Asked Questions

Why is my outside drain overflowing?
The most common causes are leaf and silt build-up in the gully or chamber restricting flow, cooking grease from the kitchen waste pipe solidifying in the external drain, or a blocked connection to the underground drain further along the pipe run. In late autumn and winter, blocked gullies in Derby are extremely common because of leaf fall from the city's mature street trees.
Can I clear an outside drain myself?
A gully with visible leaf and silt debris can often be scooped out by hand using rubber gloves and a trowel. This restores flow if the blockage is only in the top of the gully pot. If the drain is overflowing and the gully pot appears clear but flow is restricted, the blockage is further down — in the underground pipe connection or in the inspection chamber. That needs jetting.
My outside drain only blocks in heavy rain. Is that normal?
No — a properly sized and clear drain should handle normal rainfall without overflowing. Overflow only in heavy rain usually means the drain is partially silted and is coping with normal flow but not peak flow. Clearing the gully and the chamber resolves it. If it returns the following autumn, annual maintenance jetting before leaf-fall season is worth considering.
Could a blocked outside drain mean there is a structural problem?
Occasionally. If the external drain has a pattern of blocking in the same spot regardless of season — not just during leaf-fall — a CCTV survey may reveal that the underground section has a displaced joint or partial collapse that is trapping debris. We will advise if we see this pattern during the clear.

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