The Detail
Everything you'd ask a specialist on the doorstep.
Materials, methods, variations, and the small decisions that separate a 20-year driveway from a five-year one.
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Linear drains and channel grates
Linear drains, the slot-grated channel running across a driveway or in front of a garage door, are the workhorse of driveway drainage. ACO HexDrain, Aqua-Drain and similar systems handle huge surface water volumes in a 100mm-wide channel. Used at garage thresholds, perimeter low points, and crossing points where multiple surface areas drain to one collection point.
Soakaways, sized for the catchment
A soakaway is a stone-filled pit that holds surface water and lets it percolate into the surrounding ground. Sizing is critical, undersized soakaways overflow back onto the driveway, particularly during heavy rain or in clay ground. We calculate soakaway volume to the surface area being drained and the percolation rate of the local soil, not eyeballed.
French drains and perimeter drainage
A French drain is a perforated pipe in a stone-filled trench, designed to collect groundwater along a perimeter and route it to a discharge point. Used along the inside of retaining walls, around the base of slopes, and along driveways where groundwater migration is the source of flooding rather than surface rainfall.
Permeable surfacing as drainage
Resin bound, permeable block paving and gravel are themselves drainage solutions, surface water passes through the surface, through the permeable sub-base, and into the ground naturally. For SuDS compliance on a new front garden driveway, permeable surfacing is often the cleanest approach, no separate drainage required.
Connecting to existing drains
Where surface water can be discharged to an existing surface water drain (separate from foul drainage), we make compliant connections with rodding access. Discharge to combined sewers requires water company consent and is increasingly restricted. Soakaway or permeable surfacing is usually the cleaner solution.