Drainage is the artificial removal of water, both surface and sub-surface. Drainage is often a major element of civil engineering and construction projects and is necessary to avoid flooding and other damage.

Typically, effluent is conveyed by drains to sewers, and from sewers to a suitable outfall or treatment plant.

We look after all types of drainage including:

  • Subsoil water –  water collected from the earth to lower the subsoil’s water table.
  • Surface water – this is collected from surfaces such as roofs and paved areas.
  • Foul and soil water – this is effluent contaminated by domestic or trade waste. Foul (or waste) water relates to effluent from sinks and basins which does not contain excreta. Soil water relates to effluent from water closets, toilets and urinals which does.

Subsoil and surface water are considered to be clean and can be discharged into an approved watercourse (e.g. river or lake), or soakaway without treatment. Permission is required from the relevant authority or owner before discharging. Foul and soil water must be conveyed by sewer to a treatment plant before being discharged into a watercourse.

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