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HomeHow is a pressure sewer system different to a gravity sewer?

Gravity Sewer
Pipelines are laid on a grade to pumping stations or large diameter trunk sewer mains.
Minimum pipeline grades must be achieved to ensure that the wastewater velocities are sufficient that solids
don’t settle and odours don’t occur, thus meaning deep trenches, harder environmental impact and sometimes not economically viable when terrain becomes difficult.

Pressure Sewer System
Each property is provided with a small pump station unit, the property drain is connected to this pump unit and all
wastewater from the property is pumped under a low pressure to a discharge point, which could be an existing gravity sewer or treatment plant. Due to the velocities of pressure sewer smaller pipe sizes are used and only a minimum cover over the pipeline is required. Pressure sewer does not require pipeline grades unlike gravity.