What is a soakaway?
An underground pit or trench filled with rubble or permeable material that absorbs and disperses surface water, such as rainfall runoff from driveways, into the surrounding soil.
A soakaway is an underground drainage system designed to collect water from paved surfaces and allow it to permeate gradually into the earth. It typically consists of a pit or trench dug below ground level, lined with permeable material such as gravel, rubble, or drainage stone, and sometimes wrapped in geotextile membrane to prevent soil clogging.
For driveways and patios, soakaways serve a practical purpose: they manage surface water runoff that would otherwise pool on the paved area or contribute to flooding issues on the property. When rain falls on a tarmac, concrete, or block paved driveway, the water cannot pass through the sealed surface. A soakaway intercepts this runoff and disperses it into the ground gradually, reducing surface water volumes and helping to maintain stable ground conditions around the perimeter of the paved area.
Building regulations and planning authorities in many areas now require soakaways for new driveway installations, particularly on sites where rainwater cannot be directed to a public sewer or watercourse. The size and depth of a soakaway depend on the area of the driveway, local soil type, and rainfall patterns. Poorly designed or incorrectly installed soakaways can fail to drain properly, leading to water pooling or subsurface saturation. Paving contractors experienced with local Cheltenham conditions can assess whether a soakaway is necessary and ensure it is sized and positioned correctly to function effectively for the life of the driveway.