Gullies, interceptors and a yard that floods in heavy rain

13 October 2026

Heavy rain shows you the state of a yard's drainage faster than any survey. Water pools in front of the doors, a gully by the fuel island backs up instead of draining, and drivers walk to the cab through a puddle that was not there last winter. Silt and grit are worth checking. A busy freight yard collects mud from tyres and loose material from the hardstanding, much of which can wash towards the drains.

What lives in the system

Gully pots catch grit and fill. Channel drains along the loading apron collect debris swept off the trailers. Chambers gather silt where pipes join. Many yards also have an oil interceptor between the hardstanding and the outfall, designed to hold back oil and fuel so it does not reach the surface water system. Accumulated oil and silt can reduce an interceptor's effectiveness, which is why its condition needs checking. Some newer sites have sustainable drainage features such as attenuation tanks or permeable paving, and those silt up too if nobody looks after them.

Fleet operators already understand preventive maintenance. Nobody waits for a brake failure before inspecting a trailer. Drainage on a yard deserves the same treatment: a schedule, a record of each visit and a note of what was found.

A visit needs planning

Drain cleaning may bring a jetting vehicle or vacuum tanker into the yard, occupying ground normally used by your own vehicles. Decide which areas can be cleared of trailers and when. Make the chambers, gullies and interceptor lids reachable. Tell the crew which parts of the system serve what: the fuel island, the wash bay, the roof downpipes, the welfare block. The material they recover is waste, and it leaves on paperwork that should come back to you.

Industrial Drain Cleaning covers cleaning and investigation of commercial and industrial drainage, including deposit recovery, interceptors, gullies, SuDS assets, flow checks and the follow-up work that comes out of what is found.

Finish with evidence

Clearing the drain is only part of the job. Flow checks can help establish whether water is moving through the cleaned section, while a camera inspection can reveal defects in a run that repeatedly fills with silt. If one gully fills faster than the rest, there may be a broken pipe, a dip in the run or simply a stretch of yard that sends more grit its way.

Keep the records with the site file. An interceptor maintenance history matters to insurers and to anyone asking how the site protects the water around it. It is far easier to produce a folder of dated visits than to explain why there is none, and the folder tends to be asked for at the least convenient moment, usually just after the yard has flooded.