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Foul and Surface Water Drainage: Key Differences

Foul Water Drainage
  • Foul drainage refers to the system that carries wastewater away from indoor plumbing fixtures like toilets, sinks, showers, and washing machines.
  • This water is often contaminated with sewage, soap, food waste, and other pollutants.
  • For properties connected to mains drainage, the foul water will be transported through underground pipes to a sewage treatment plant for processing before being safely returned to the environment.
Surface Water Drainage
  • Surface water drainage is designed to carry rainwater away from outdoor surfaces like gutters, driveways, patios, roads, and sports fields.
  • Unlike foul water, surface water is non-contaminated and typically flows into a stream, river, or soakaway.
  • It helps to manage rainwater runoff and prevent flooding by directing excess water away from properties.
Why Keep Them Separate?
  • Foul and surface water drainage systems should be separate, except in older properties with combined drainage systems.
  • Keeping them separate ensures that rainwater is not contaminated and can safely return to natural water bodies, while wastewater is treated to prevent pollution and health hazards.

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