Understanding Drainage Systems

When you're thinking about your property's water management, it's crucial to understand two primary types of drainage: 'foul' drainage and 'surface water' drainage. Generally, these two systems must operate independently. Each system also has visible parts above the ground and hidden components beneath it.

Foul Water Drainage: This system is responsible for carrying away all the wastewater generated inside your home. This includes water from your toilets, wash basins, baths, showers, bidets, kitchen sinks, dishwashers, and washing machines. The pipes you see above ground are known as sanitary pipework, while the hidden pipes underground are referred to as foul drains and foul sewers.

Surface Water Drainage: This system handles water from precipitation – specifically rainwater, melted snow, and ice that falls on hard surfaces like roofs, patios, and driveways. The visible parts, such as your gutters and downpipes, manage water from your roof. Beneath the ground, these systems consist of surface water drains and surface water sewers.

What's the Difference Between a Drain and a Sewer?

You might wonder about the distinction between a drain and a sewer, as this defines who is accountable for its upkeep. A drain carries wastewater exclusively from your property and is therefore your personal responsibility. Conversely, a sewer handles wastewater from multiple properties, and its maintenance typically falls to a water company (often referred to as a sewerage undertaker).

The point where your private drain transitions into a public sewer usually occurs when it links up with a neighbouring property's drain or directly connects to the main public sewer system.

Why Should You Be Aware of Your Underground Drainage?

Having a clear understanding of your property's underground drainage system is critically important. Any construction or renovation projects you plan, particularly extensions or installing new hard surfaces, could significantly impact the existing pipework. It's your duty to prevent any harm to these pipes and ensure they continue to operate efficiently.