19/10/2026
On flat, hilly or rocky sites, gravity sewer can be the most expensive option on the table.
Holding the required gradient can mean deeper trenches, more manholes and costs that climb quickly. Gravity, pressure and vacuum sewer each move wastewater differently, and each suits different site conditions.
Our comparison guide explains where each system tends to fit and how capital and operating costs compare over the life of a network.
Read the full comparison: https://www.globalwatergroup.com.au/our-blog/gravity-sewer-vs-pressure-sewer