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Preventing Sewage Overflows

When too much rainwater enters the sewer pipe system it creates an overflow of sewerage onto our streets and properties. This exposure to dirty water poses health risks. In order to manage these risks, property owners are required to ensure stormwater does not enter the wastewater system.

How is stormwater entering the sewer?

  • Stormwater flows into gully traps that are too low
  • Downpipes from roofs lead to wastewater pipes /gully traps
  • Drainage pipe joints that leak or cracked pipes

What is a gully trap?

Gully traps are the most common way that stormwater enters the sewerage system. They are usually located outside of bathrooms, kitchens and laundries. The purpose of gully traps is to collect wastewater from these areas and discharge it into the wastewater system. Rainwater from roofs and section runoff should not enter the gully trap.

The top of any gully trap that has a raised lip should be at least 25mm above the ground on paved areas and at least 100mm above the ground in unpaved areas.

Signs of Overflow problems are:

  • Wastewater manholes surging (lids popping)
  • Pump station and gully trap overflows

If you see any of the above, contact our team here.

Click here for more information on stormwater.