Comparison of vacuum and gravity sewerage

	Vacuum sewer	Gravity sewer
Trench depth
Trench depth	Typically 1,2 m	3-5 m on average
Layout flexibility
Layout flexibility	Can flow uphill and around obstacles	Requires a drop to avoid obstruction
Pipe integrity
	Watertight welded PE joints No ex- and infiltration	Joints and cracks can leak

Why is it beneficial to establish a vacuum system?

• Investment cost saving

• Flexible (vertical and horizontal as well) pipework layout

• Rapid construction

• Environmentally friendly solution